virtual users group-svc 4-23-2009

7/16/2019 Virtual Users Group-SVC 4-23-2009

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2009 IBM Corporation IBM Systems

I nnovation that mattersVirtual Users Group

SVC Architecture Overview

Bill WiegandAdvanced Technical Support


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IBM System StorageTM

2009 IBM Corporation2

Agenda

Todays Storage Challenges

SVC Architecture

SVC Migration

SVC Copy Services

Space-Efficient VDisks

VDisk Mirroring


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2008 IBM Corporation



FC Switch

Management

Application

DS5K Storage ManagerHDS Mgmt. ApplicationDS8K Specialist

SDD Drivers SDD Drivers HDS Drivers HDS Drivers RDAC Drivers

HDS DS5000DS8K Remote Copy ?

Flashcopy ?

Proprietary, non-interoperable

Copy Services

No common storage

management interface

Static relationship between

servers and storage systems

Inefficient use of storage

resources

Migration of data disruptive and

time consuming

Monolithic, potentially expensive

storage devices Pay for functionality when really

just need capacity

Use SVC and TPC to addressOut

of

Space

Out

of

Space

Out

of

Space

Storage Challenges Today

Free

capacity

010101010101010101

010010101101001000

Data Migration
http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/7/thumb/1056986_4.jpg&file=1056986&id=1015648&show_doss=yes&title=IBM%20eServer%20xSeries%20230%20%282000%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/56/thumb/50751356_4.jpg&file=50751356&id=50751357&show_doss=yes&title=IBM%20TotalStorage%20SAN%20Switch%202109-F16%20%282002%29http://www.mediapool.dewe.de/public/ibm/shop/archive/pic_show.php?path=/opt/coma/archive/ibm/data/56/thumb/50751356_4.jpg&file=50751356&id=50751357&show_doss=yes&title=IBM%20TotalStorage%20SAN%20Switch%202109-F16%20%282002%29


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What is the IBM SAN Volume Controller (SVC)? A SAN-based in-band storage virtualization product

Appears as a disk controller providing LUNs to servers

These can be thin provisioned

Virtualizes IBM and non-IBM storage (over 175 systems from EMC, Dell, HP, HDS,

NetApp, Sun, Pillar, & STK)

Provides non-disruptive data migrations between different storagesystems/different storage tiers

Provides copy services between different storage systems

A stable and proven product with 4,500 clients, 50PB of data managed, and

an install base of 14,000 SVC nodes and growing

And its fast, as measured by the Storage Performance Council

www.storageperformance.org


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IBM SAN Volume Controller

EMCIBM

LUN

4

LUN

3

LUN

2

LUN

1

LUN

4

LUN

3

LUN

2

LUN

1

MD

4

MD

3

MD

2

MD

1

MD

8

MD

7

MD

6

MD

5

Managed disks

SCSI LUNs

VD

4

VD

3

VD

2

VD

1

VD

7

VD

6

VD

5

Virtual disks

Virtual-to-physical Mapping

High Perf Low Cost

The SAN Volume

Controller

insulates the host

systems from the

effects of changesin the physical

environment so disk

subsystems can be

moved in and out.

Copy services can

span dissimilarsubsystems as well.

Hosts still see SCSI

LUNs mapped to

them that they

believe are physical

disks, but are really

Virtual Disks, a set

of pointers

basically, that are

created with the

capacity and quality

of service required

by the application.

- 8196 VDisks Max

The SVC controls

the mapping of

Virtual Disks to

Managed Disksand preserves the

metadata in every

nodes cache and

on a quorum disk.

SCSI LUNs are still

mapped to what they

believe are hosts, but

are really SVC nodes.

SVC discovers the LUNsas Managed Disks.

- 4096 MDisks Max

Managed Disks

are collected into

Managed Disk

Groups to

facilitate different

tiers of storagecapacity.

- 128 MDGs Max

- 128 MDisks per

MDG Max


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StorageNetwork

Managed Disks

Virtual DisksVirtual DisksVirtual DisksVirtual Disks

Node Node Node Node Node

Designed to be a redundant, modular, scalable, solution

VDisk I/Os are ownedby a pair of nodes andhost writes are mirroredbetween those nodes

Node NodeNode

Each node is an xSerieseServer with 8GB ofcache providing a total of16GB of Read/Writecache per node pair

The pool of managed disks is

controlled by a cluster of

managed nodes (up to 4 pairs,

scaling higher in the future)

SVC - Clustering


7/46 2008 IBM Corporation



I/O Group A I/O Group B

MDG1

MDG2

MDG3

Image Mode:Virtual Disk = Physical LUN

Used to bring existing data under SVC

Sequential Mode:

Virtual Disk mapped sequentially to

a contiguous portion of one

managed disk - It cannot span

more then one managed disk

Striped Mode:

Virtual Disk striped

across multiple managed

disks in a MDG

A

A

B

B

C

C

C

SVC - Virtual Disk Modes





Base Offering

Model Cache FC Adapters

2145-8G4 8GB One 4 Port HBA

Why specify the engine?

Minimize complexity

Appliance mentality

Easily scale performance

Non-disruptive hardware upgrades

Concurrent software code loads

SVC Hardware

Dual Storage Engine Clustered System- Up To Four Engine Pairs Supported

UPS (Required with the SVC)

- 1U Form Factor

Each Engine Contains:

- Modified xSeries x3550 Serve- 1U 19" Rack Mounted Enclosure

- One quad-core Intel Xeonprocessor at 2.33GHz

- Front side bus 1333Mhz

- 8GB of cache

- Single 160GB SATA disk drive

- Dual 10/100/1000 Ethernet Ports

- PCIe/Express 8 lane bus for HBA

- Single 4 Port, 4Gbs fibre HBA

- Management Module- Heart Beat Timer

- Control for VFD Display/Keypad

- Power button intercept

- Secondary Flashboot Device

- Front Bezel

- VFD Display

- 5 Button Keypad





SVC Performance

SAN

Cache

8GB per node

cache means

that many readsare handled by

SVC directly

All writes are

cached, means

write to sameblock is handled

by SVC directly

without destage

Striping

Striping spreads

I/O workload

across manydisks, even across

disk controllers

Can greatly reduce

hot spots as I/O

from differentapplications are

spread across

multiple disks

SPC-1 Benchmark Results: 275K I/Os for an 8 node cluster


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Understanding Host to SVC I/OW2K NVL AIX Linux SUN HPMaster

Console

SVC Node 1 SVC Node 2

Fabric 1 Fabric 2

EMC

SCSI initiator

SCSI initiator

SCSI target

SCSI target

SVC

Host I/O

GUI/CLI

DS Family

W2K3 VMWare

4 FC ports per SVC


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I/O Group and Write I/O Distributed Cache

UPS2UPS1

RED1

200 GB

RED3

200 GB

RED2

200 GB

V1 V2

SVC node1

Cache

SVC node2

Cache

I/O Group1

Preferrednode

Alternative

node

1

3

2

2

Write I/O request


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I/O Group - Node Failover1

UPS2UPS1

RED1

200 GB

RED3

200 GB

RED2

200 GB

V1 V2

SVC node1

Cache

SVC node2

Cache

I/O Group1

Alternative

node path

2

3

1

Write I/O request


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AIX1 VDisk1 Preferred Node and Paths

I/O Group

AIX1

A1 A2

2321 22 24SVC2

Fabric 1

1311 12 14SVC1

Fabric 2

24142111 22122313

ESS

E1D1 E2D2

A1 A2

Preferred node Alternate node

V1

1 2 1 2

1 1

ID

11

ID

21

ID

12

ID

22

AIX1-A1 Zone

(21,1;11,1;11,2)

AIX1-A2 Zone

(22,1;12,1;12,2)

V1

Preferred

paths

Alternate

paths

I/O driven only to

paths on

preferred node


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I/O Group

AIX1

A1 A2

2321 22 24SVC2

Fabric 1

1311 12 14SVC1

Fabric 2

24142111 22122313

ESS

E1D1 E2D2

A1 A2

Preferred nodeAlternate node

V2

1 2 1 2

1 1

ID

11

ID

21

ID

12

ID

22

AIX1-A1 Zone

(21,1;11,1;11,2)

AIX1-A2 Zone

(22,1;12,1;12,2)

V2

Preferred

paths

Alternate

pathsI/O driven only to

paths on

preferred node

AIX1 VDisk2 Preferred Node and Paths


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Understanding SVC to Disk Controller I/OW2K NVL AIX Linux SUN HPMaster

Console

SVC Node 1 SVC Node 2

Fabric 1 Fabric 2

EMC

SCSI initiator

SCSI initiator

SCSI target

SCSI target

SVC

Host I/O

GUI/CLI

DS Family

W2K3 VMWare

4 FC ports per SVC


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Multipathing from SVC to disk controller built into SVC software No need for Powerpath, RDAC or SDD to talk to disk controllers

All SVC nodes must see same set of LUNs from disk controller

Otherwise degraded mode on controller and/or MDisks

All SVC ports zoned to controller ports must see same set of

LUNs

Otherwise degraded mode on controller and/or MDisks

SVC to Disk Controller I/O


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All SVC nodes direct I/O to a specific LUN via a single diskcontroller port

Doesnt load balance I/Os to a specific LUN over multiple ports on

the disk controller

For example:

Six fibre ports on DS8K zoned with 4 node SVC cluster

Sixteen 8 packs in DS8K each configured as one big LUN

SVC discovers 16 LUNs/MDisks as MDisk 1-16

SVC cluster accesses MDisks 1,7 and 13 via DS8K port 1



SVC cluster accesses MDisks 4,10 and16 via DS8K port 4

SVC cluster accesses MDisks 5 and11 via DS8K port 5

SVC cluster accesses MDisks 6 and 12 via DS8K port 6

SVC to Disk Controller I/O


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SAN Fabric A SAN Fabric B

Node 3

1 2

3 4

I/O G-1

1 2

3 4

Node 4

Node 1

1 2

3 4

I/O G-0

1 2

3 4

Node 2

MDisk10/Array10

MDisk8/Array8

MDisk7/Array7

MDisk6/Array6

MDisk9/Array9

MDisk5/Array5

MDisk3/Array3

MDisk2/Array2

MDisk1/Array1

MDisk4/Array4

MDisk11/Array11

MDisk12/Array12

MDisk13/Array13

MDisk Group 1 / DS5K_1

VDisk 1

VDisk 2

VDisk 3

VDisk 4

SVC

Cluster

Channels 1

and 3

HOST ZONING

Create a SVC/Host zonefor each server thatreceives storage fromthe SVC cluster.

Example:

Zone Server 1 port A (RED)with all SVC node port 1's.

Zone Server 1 port B (BLUE)with all SVC node port 2's.Zone Server 2 port A (RED)with all SVC node port 3's.

Zone Server 2 port B (BLUE)with all SVC node port 4's.

*** NOTE ***SVC supports a maximum of256 host objects per I/Ogroup thus a maximum of1024 per cluster. The abovehost zoning results in eachserver being seen by everyI/O group and the defaulthost object creationbehavior results in eachhost object counting as onetowards this 256 maximum.

To create more then 256host objects in the clusteryou must zone a host to asubset of the I/O groups,you must assign the hostobject at host creation timeto that same subset of I/Ogroups and then you mustassign that hosts VDisks toone of those I/O groups inthat same subset.

Server 1

A B

Server 2

A B

SVC CLUSTER

ZONING

Create one zone in theRED fabric with all theSVC node ports cabledto Fabric A and createone zone in the BLUEfabric with all the SVCnode ports cabled toFabric B.

Example:

All odd (RED) SVC nodeports in one zone and alleven (BLUE) SVC node portsin one zone.

Note: For a cluster to becreated and to operatecorrectly all node ports mustbe zoned together.

STORAGE

ZONING

Create a SVC/Storagezone for each storagesubsystem virtualizedby the SVC cluster.

Example:

Zone DS5K_1 controller Aand B daughter cardchannel ports 1 and 3 withall SVC node ports 1 and 3in the RED fabric.

Zone DS5K_1 controller Aand B daughter cardchannel ports 2 and 4 withall SVC node ports 2 and 4in the BLUE fabric.

Cntrl A

Channels 2

and 4

Channels 2

and 4

SVC Cabling

and Zoning

Cntrl B

Channels 1

and 3

Best Practice


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Common Platform for Advanced Functions

Single point for copy services

Asynchronous remote copy/Global Mirror

Synchronous remote copy/Metro Mirror

Point-in-time copy/FlashCopy

Data Migration

Use to meet business needs

Disaster recovery up to 8000KM

Business Continuance less then 300KM

LAN/Server free backup, DB clones

Tiered storage, disk replacement

VISC

Managed Disks

Virtual LUNsVirtual LUNsVirtual LUNsVirtual LUNs

VISC VISC VISC VISC VISCVISC VISC

StorageNetwork

VISC

Managed Disks



StorageNetwork

IBM S t St


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SAN Volume Controller SAN Volume Controller

EMCDS8K

LUN

4

LUN

3

LUN

2

LUN

1

LUN

4

LUN

3

LUN

2

LUN

1

SVC Remote Copy Services

HDSXIV

LUN

4

LUN

3

LUN

2

LUN

1

LUN

4

LUN

3

LUN

2

LUN

1

Cross-device

consistency groups

IBM S t St


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Source volume may be spread across multiple disk subsystems Target volume may be to one or more disk subsystems, different than the source

Two SVC clusters connected to each other over a fibre channel fabric

10km Fibre distance supported with LW SFPs

Extended distance support using FC "Extenders/Routers/DWDM" hardware

One-to-one volume relationship

Source and Target virtual disk must be the same size

Suspend/Resume support

Failover/Failback support

Consistency Group support Up to 256 groups

Invoked via Web User Interface, CLI or scripts

Licensed independently of base virtualization software and FlashCopy

License includes both sync and async replication capability

Support for Intra-cluster remote copy allows for testing within one cluster

Remote Copy Services

IBM S t St


22/46









Data Migration


Disaster recovery up to 10,000KM

Disaster recovery less then 300KM



VISC

Managed Disks



StorageNetwork

VISC

Managed Disks



StorageNetwork

IBM S t St TM


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SAN Volume Controller SAN Volume Controller

EMCDS8K

LUN

4

LUN

3

LUN

2

LUN

1

LUN

4

LUN

3

LUN

2

LUN

1

HDSXIV

LUN

4

LUN

3

LUN

2

LUN

1

LUN

4

LUN

3

LUN

2

LUN

1

SAN FlashCopy

outside the box

SVC FlashCopy Overview

Cannot FlashCopy

across SVC clusters



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SAN Volume Controller

EMCDS8K

LUN

4

LUN

3

LUN

2

LUN

1

LUN

4

LUN

3

LUN

2

LUN

1


XIV

LUN

4

LUN

3

LUN

2

LUN

1

Cross-device

consistency groups



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Source volume may be spread across multiple disk subsystems

Target volume may be to one or more disk subsystems, different than the source

Create up to 256 copies of a source volume

Support for full, incremental, cascaded, space-efficient and nocopy mappings

Copy is accessible almost immediately

Copy may be updated independently of the source

Background Copy Rate establishes copy rate goal

Value of 0 has a "No Copy" effect

Data rate 128 KB/s to 64 MB/s per vDisk

Support for 128 Consistency Groups

Up to 4096 Source/Target volume relationships

Invoked via Web User Interface, CLI or scripts

Licensed independently of base virtualization software and Metro/Global Mirror

Priced per TB for source VDisks only




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Data Migration


Disaster recovery up to 10,000KM

Disaster recovery less then 300KM



VISC

Managed Disks



StorageNetwork

VISC

Managed Disks



StorageNetwork



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Data Migration Existing Environment

SAN

Evolutionary steps

Install SAN Volume Controller

Stop host I/O to LUNs chosen for migration

Update HBA BIOS/Firmware and change

multipath drivers as needed

Map existing LUNs to SVC using Image mode

Reassign Image mode VDisks from SVC to host Restart applications

No data movement required

Arrays now managed as a virtualized pool

Data moved, striped, rebalanced

Application servers unaware of physical

changes

Evolve rest of the SAN in the same manner

At already planned downtime

As fast or slow as needed

Future changes under SVC now transparent

Array 1 Array 2 Array 3 Array 4

Block virtualization

Block virtualization



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Non-virtualized: Existing Data Unchanged But Under SVC

ImageMode_MDG

BLUDATA

16 GB

Partial extent

Extent 5c

Extent 5a

Extent 5b

Extent 5d

Extent 5e

Extent 5f

Extent 5g

Extent 5c

BLUDATA

16 GB

BLUDATA

16 GB

Image Mode VDisk Image Mode MDisk Is EMC LUNwith Existing Data

Image Mode MDisk



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BLUDATA1

4 GB

Virtualized: Existing Data Migrated And Now Native To SVC

BlueData_MDG

BLUDATA

16 GB

Partial extent

Extent 5c

Extent 1a

Extent 1b

Extent 1d

Extent 1e

Extent 1f

Extent 1g

Extent 1c

BLUDATA

16 GB

Virtualized

BLUDATA2

4 GBMigrate

BLUDATA

16 GB

Striped VDisk

Migrate extents

Image Mode VDisk

BLUDATA3

4 GB

BLUDATA4

4 GBExtent 5c

Extent 1aExtent 2a

Extent 4a

Extent 1b

Extent 2b

Extent 3a

Extent 3b

Extent 4b

Image Mode MDisk Is EMC LUNwith Existing Data

Managed Mode MDisks

From Any Supported

Subsystem (i.e. HDS-IBM)



30/46


IBM System Storage


BLUDATA1

4 GB

Non-virtualized: Migrate Virtualized Data Back To Remove SVC

BlueData_MDG

BLUDATA

16 GB

Partial extent

Extent 5c

Extent 1a

Extent 1b

Extent 1d

Extent 1e

Extent 1f

Extent 1g

Extent 1c

BLUDATA

16 GB

Virtualized

BLUDATA2

4 GBMigrate

BLUDATA

16 GB

Striped VDisk

Migrate extents

Image Mode VDisk

BLUDATA3

4 GB

BLUDATA4

4 GBExtent 5c

Extent 1aExtent 2a

Extent 4a

Extent 1b

Extent 2b

Extent 3a

Extent 3b

Extent 4b

Managed Mode MDisks

From Any Supported

Subsystem

Image Mode MDisk Is EMC LUNwith Existing Data again



31/46


IBM System Storage


Virtual

Disk

R5 R5R5

MDiskGroupA

RAID Controller

R5

LUN

MDisks

SCSI LUNs

73 GB Drives

R5 R5R5

MDiskGroupB

RAID Controller

R5

LUN

R5

LUN

R5

LUN

300 GB Drives

R5

LUN

R1

LUN

Disk Drives

Migration

Server1 Application AccessSegregating data access fromstorage infrastructure

management

Migrate VDisk

Migrate extents



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IBM System Storage


Virtual

Disk

R5 R5R5

MDiskGroupA

RAID Controller

R5

LUN

MDisks

SCSI LUNs

Storage SubsystemA

R5 R5R5

MDiskGroupB

RAID Controller

R5

LUN

R5

LUN

R5

LUN

Storage SubsystemB

R5

LUN

R1

LUN

Storage Subsystem

Migration

Server1 Application Access

Segregating data access from

storage infrastructure

management

Migrate VDisk

Decommission

Migrate extents



33/46


IBM System Storage


Extent 1a

Extent 2a

Extent 1fExtent 1b

Extent 2b

Extent 2g

Extent 1c

Extent 2c

Extent 1e

Managed Disk Group

Extent 3a

Extent 3b

Extent 3c

Extent 3dExtent 3e

Extent 3f

Extent 3g

Extent 2a

Extent 2b

Extent 2c

Extent 2dExtent 2e

Extent 2f

Extent 2g

Extent 1a

Extent 1b

Extent 1c

Extent 1dExtent 1e

Extent 1f

Extent 1g

Managed Disks

Extent 1a

Extent 2a

Extent 3aExtent 1b

Extent 2b

Extent 3b

Extent 1c

Extent 2c

Extent 3c

Virtual

Disk

Migrate extents

Redeploy

Remove



34/46

IBM System Storage


New Core Functions in SVC

Space-Efficient VDisk - SEV

Used to implement thin provisioning/overallocation

Used to implement Space-Efficient FlashCopy

No real change to FlashCopy itself

VDisk Mirroring - VDM

Allows creation of a single VDisk with pointers to two sets ofMDisk extents

Copies can be in different MDGs on different disk controllers

Implemented as independent components betweenFlashCopy and Virtualization in the SVC I/O stack

Below Cache for best performance

SEV below FlashCopy to allow Space-Efficient FC

VDM above SEV to allow different structures per copy

VDM and SEV included in base SVC license

Remote Copy

Cache

FlashCopy

SCSI Front-end

SEV

Virtualization

SCSI Back-end

VDM



35/46

y g


SEV Conceptual View

Users can create VDisks that have different Real and Virtual Capacities Real Capacity defines how much disk space is actually allocated to a VDisk

Virtual Capacity defines how large the VDisk appears to the host

A directory maps the virtual address space to the real address space

Implemented as a B-Tree and stored on backend disk

Directory and User data share the Real Capacity

Virtual CapacityDirectory

Real Capacity

Host Server Managed

Disk Group Controller

Space-Efficient VDisk



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y g


SEV Virtual and Real Capacity

Specify Virtual and Real Capacities at VDisk creation

VDisk appears to have Virtual Capacity to hosts

VDisk is allocated enough extents to make up the Real Capacity

Virtual LBA 0 Virtual LBA Max

Real LBA 0 Real LBA Max

Virtual Capacity

2GB

Real Capacity

1GB



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SEV Used and Free Capacity

Host writes I/Os to the VDisk at any LBA which increases the UsedCapacity of the Space-Efficient VDisk

Allocation Unit for Real Capacity is called Grain Size: 32 KB, 64 KB, 128

KB or 256 KB. When writing to grain unused space formatted with zeros

SVC consumes


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y g


SEV Managing Unused Capacity

Virtual Capacity2GB

Real Capacity1GB

WarningCapacity 800MB

Used Capacity600MB

If the Used Capacity reaches the Real Capacity then the VDisk will gooffline and application I/Os will fail

User must provision more storage to expand the Real Capacity to get

the VDisk back online

SVC helps you to avoid exhausting the Real Capacity allowing for alertsto be sent to admins to provide space or by increasing Real Capacity

automatically



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VDisk Mirroring (VDM)

VDisk

MDiskcopy 2

SAN

SAN

Volume Controller

View to list VDisks affected by disk controller shutdown/failure Allows user to verify that all mirrored VDisks will remain accessible if a controller is

taken offline planned or unplanned

Lists any VDisks that will go offline due to disk controller shutdown/failure

svcinfo lscontrollerdependentvdisks

VDM allows creation of VDisk with two copies ofMDisk extents Copies can be in different MDisk groups

Copies can be of completely different structures

Image, striped, sequential, space-efficient

Minimal impact to VDisk availability if one set of MDisks(a disk array) goes offline

Automatic incremental resync

VDM sits below the cache and copy services FlashCopy, Metro Mirror, Global Mirror have no

awareness that a VDisk is mirrored

Anything that can be done today with a VDisk can be donewith a mirrored VDisk including migration, expand/shrink, etc.



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VDM Using For Migration

Migrate VDisk between MDisk Groups with different extent sizes

Add a copy in the new MDisk Group

Wait for synchronization to complete

Remove copy in original MDisk Group

Migrate from space-efficient to fully-allocated VDisk

Migrate from image/striped/sequential mode to a sequential VDisk

Can control copy rate of migration and even suspend/cancel migration

Same controls as FlashCopy

Default copy rate setting is 50 which is 2MB/s

Can control how extents are ordered/striped

If laid out originally so all VDisks start on different MDisk can preserve this configuration

If issue is all start on same MDisk you can change on second copy

Can split off a copy and create a new independent VDisk



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SAN

Volume Controller

SAN Volume Controller Version 4.3.1Supported Environments

SAN with 4/8Gbps fabrics

HPMA, EMA

MSA, EVA 4400XP 24000/20000

HitachiLightningThunder

TagmaStoreAMS, WMS, USP

EMC

CLARiiON

Symmetrix

Microsoft

WindowsHyper-V

IBM AIX

i5 V6R1via VIOS

SunSolaris

HP-UX 11i

Tru64OpenVMS

Linux

(Intel/Power/zLinux)RHEL

SUSE

IBMBladeCenter

SAN

SAN

Volume Controller

Continuous Copy

Metro Mirror

Global Mirror

VMwareSRM

Point-in-time CopyFull volume, Copy on write

256 targets,Incremental, Cascaded

Space-Efficient

NovellNetWare

Sun

StorageTek

IBM

DSDS3K/4K

DS5000

DS6000

DS8000

IBM

ESS,

FAStT

1024Hosts

iSCSI to hosts

Via Cisco IPS

IBM

N series

NetApp

FAS

SGI IRIX

IBM N seriesGateway

NetApp

V-Series

IBM TS7650G

Bull

StoreWay

Fujitsu

Eternus

NEC

iStorage

For the most current, and more detailed, information please visit ibm.com/storage/svc and click on Interoperability.

Space-Efficient Virtual Disks

New

Entry Edition software

Virtual Disk MirroringNew

AppleMac OS

New

Pillar

Axiom

300, 500

IBM

XIV

New

IBMz/VSE

New

New

New

New



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2008 IBM Corporation 2009 IBM Corporation42

EMCIBM

LUN

4

LUN

3

LUN

2

LUN

1

LUN

4

LUN

3

LUN

2

LUN

1

MD

4

MD

3

MD

2

MD

1

MD

8

MD

7

MD

6

MD

5

Managed Disks

SCSI LUNs

VD

4

VD

3

VD

2

VD

1

VD

7

VD

6

VD

5

Virtual Disks

Virtual-to-physical Mapping

High Perf Low Cost

Managed Disk

Groups

Scalable Performance

Buy nodes if you need performance

Buy disk if you need capacity

Simplified Management

Efficient Storage Utilization

Tiered Storage

Thin Provisioned Volumes

VDisk Mirroring

Exploits heterogeneous environment

Copy services between dissimilar storagesystems

Eliminates Copy Services licenses on eachdisk subsystems

Non-disruptive SVC HW/SW upgrades

Non-disruptive data migrationbetween heterogeneous devices

Easy technology refreshes

Easy tiering of data

Free multi-path driver support

SDD

What Makes SVC Special?



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Websites for marketing and support information http://www.ibm.com/storage/software/virtualization

http://www.ibm.com/storage/support/2145

Publications

http://www.ibm.com/shop/publications/order

Planning Guide GA32-0551

Hardware Installation Guide GC27-2132

Software Installation/Configuration Guide SC23-6628

Host Attachment Guide SC26-7905

Service Guide SC26-7901

Command-Line Interface Users Guide SC26-7903

Redbooks

http://www.ibm.com/redbooks

Search on SAN Volume Controller

Reference Materials



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innovation that matters

Question and Answer Time



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Copyright 2006 by International Business Machines Corporation.

No part of this document may be reproduced or transmitted in any form without written permission from IBM Corporation.

Product data has been reviewed for accuracy as of the date of initial publication. Product data is subject to change without notice. This informationcould include technical inaccuracies or typographical errors. IBM may make improvements and/or changes in the product(s) and/or programs(s) at

any time without notice.

Unless otherwise note, the performance data contained herein was obtained in a controlled, isolated environment. Actual results that may beobtained in other operating environments may vary significantly. While IBM has reviewed each item for accuracy in a specific situation, there is noguarantee that the same or similar results will be obtained elsewhere. Other data may have been obtained from publicly available documents orsources. In such cases, IBM has endeavored to provide comparable measurements for systems being compared.

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The information provided in this document is distributed "AS IS" without any warranty, either express or implied. IBM EXPRESSLY DISCLAIMSany warranties of merchantability, fitness for a particular purpose OR NONINFRINGEMENT. IBM shall have no responsibility to update thisinformation. IBM products are warranted according to the terms and conditions of the agreements (e.g., IBM Customer Agreement, Statement ofLimited Warranty, International Program License Agreement, etc.) under which they are provided. IBM is not responsible for the performance orinteroperability of any non-IBM products discussed herein.

Information concerning non-IBM products was obtained from the suppliers of those products, their published announcements or other publiclyavailable sources. IBM has not tested those products in connection with this publication and cannot confirm the accuracy of performance,compatibility or any other claims related to non-IBM products. Questions on the capabilities of non-IBM products should be addressed to thesuppliers of those products.

The provision of the information contained herein is not intended to, and does not, grant any right or license under any IBM patents or copyrights.Inquiries regarding patent or copyright licenses should be made, in writing, to:

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The following terms are trademarks or registered trademarks of the IBM Corporation in either the UnitedStates, other countries or both.

IBM, S/390, ES/3090, ES/9000, AS/400, RS/6000, MVS/ESA, OS/390, VM/ESA, VSE, TPF, OS/2, OS/400,AIX,, FlashCopy, z/VM, z/OS, POWER5, POWER5+, DB2, Universal Database

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Trademarks

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