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MySQL and SSD

Vadim TkachenkoPercona Inc, co-founder, CTO

www.percona.comwww.SSDPerformanceBlog.com

vadim@percona.com

World is spinning

MySQL and SSD

Physical limits

MySQL and SSD

Rotate faster

MySQL and SSD

millisecondsAccess time

MySQL and SSD

More spindles

MySQL and SSD

Still milliseconds

MySQL and SSD

Access time

MySQL and SSD

MySQL and SSD

Data fits into memory

Data

exceeds

memory

MySQL and SSD

Flash Access time

MySQL and SSD

MySQL throughput with Flash

MySQL and SSD

5x+Times difference

Flash

MySQL and SSD

MySQL and SSD

Erase size

MySQL and SSD

Write once

MySQL and SSD

MySQL and SSD

No rewrites

MySQL and SSD

MySQL and SSD

Garbage collector

MySQL and SSD

Write amplificationFlash writes more than application

MySQL and SSD

Software matters

MySQL and SSD

Hardware is less important

MySQL and SSD

MySQL and SSD

Firmware

+

execution

Flash quality is defined by software

MySQL and SSD

Flash types

MySQL and SSD

Single Level Cell – 1bit

MySQL and SSD

Multi Level Cell – 2 bit

MySQL and SSD

Multi Level Cell – 3 bit

MySQL and SSD

SLC vs MLC

MySQL and SSD

Erase cycles

MySQL and SSD

• SLC 100.000 cycles

• MLC 10.000 cycles

• 25nm MLC 5.000 cycles

SLC

MySQL and SSD

MLC

MySQL and SSD

Space provisioning – Virident FlashMax 1400

MySQL and SSD

User space

1.4TB

Internal Space

0.6TB

SATA vs PCI Express

MySQL and SSD

SATA SSD

MySQL and SSD

My benchmarks story2 Intel 320 SSD cards

MySQL and SSD

How do I install it?

MySQL and SSD

I need

MySQL and SSD

Initial setup

MySQL and SSD

Polished setup - AccuSTOR AS108X

MySQL and SSD

RAID controllers

MySQL and SSD

Last component - cable

MySQL and SSD

PCIe is different

MySQL and SSD

PCIe

MySQL and SSD

Just plug into a PCIe slotBut SATA is hot-swap

MySQL and SSD

Benchmarks lie

MySQL and SSD

Benchmark challenge: internal state

MySQL and SSD

Benchmark challenge: capacity

MySQL and SSD

Unrepeatable results

MySQL and SSD

Benchmark challenge: filesystems

MySQL and SSD

Benchmark challenge: filesystems

MySQL and SSD

Xfs already fixed bug in source code4x improvement

MySQL and SSD

Benchmark challenge: filesystems

MySQL and SSD

Ext4 – sync – random write

MySQL and SSD

xfs – sync – random write

MySQL and SSD

Ext4 vs xfs – async

MySQL and SSD

135

98

0

20

40

60

80

100

120

140

160

ext4 xfs

MiB

/ s

ec

async writes

To add to confusion: in MySQL

MySQL and SSD

Ext4 vs xfs – your choice

MySQL and SSD

Comparing apples

MySQL and SSD

Flash vendors~50 on market

MySQL and SSD

Random 16KiB reads

MySQL and SSD

50

222

417

195

1300

0

200

400

600

800

1000

1200

1400

MiB

/ s

ec

8 HDDSTEC4 STECIntelVirident

Random 16KiB writes

MySQL and SSD

35

135

223

92

520

0

100

200

300

400

500

600

MiB

/ s

ec

8 HDDSTEC4 STECIntelVirident

Price

MySQL and SSD

24001500

6000

270

18000

02000400060008000

100001200014000160001800020000

Pric

e, $

8 HDDSTEC4 STECIntelVirident

PCIe vs SATAWhich one to choose?

MySQL and SSD

PCIe for absolute performanceI use it because I have free samples

MySQL and SSD

SATA for performance per $I would use it if I had to buy…

MySQL and SSD

When should I use flash?

MySQL and SSD

Very good for random readsBoth SLC and MLC

MySQL and SSD

Random WritesMaybe challenge for MLC

MySQL and SSD

SLC lifetime

MySQL and SSD

MLC lifetime

MySQL and SSD

Write amplification

MySQL and SSD

Experiment – tpcc-mysql

MySQL and SSD

Flash for MySQL

MySQL and SSD

When Flash helps

MySQL and SSD

Most important decision

MySQL and SSD

MySQL and SSD

You need

MySQL and SSD

Choices

MySQL and SSD

Benchmarks again

MySQL and SSD

MySQL and SSD

STEC SSD vs HDD: 8x gain

MySQL and SSD

750

90

0

100

200

300

400

500

600

700

800

SSD HDD

tps

STEC innodb_flush_log_at_trx_commit

MySQL and SSD

750

490

0

100

200

300

400

500

600

700

800

trx_commit=2 trx_commit=1

tps

MySQL IO workloads

MySQL and SSD

innodb_flush_log_at_trx_commit=1

MySQL and SSD

STEC: InnoDB log location

MySQL and SSD

740

490

0

100

200

300

400

500

600

700

800

logs on RAID with cache logs on SSD

tps

STEC – RAID card

MySQL and SSD

750810

0100200300400500600700800900

LSI 9211 (no cache) LSI 9260 (with cache)

tps

Log size matters

MySQL and SSD

Big log file 8GB (Percona Server)

MySQL and SSD

Flushing algorithm is important

MySQL and SSD

Innodb_adaptive_checkpoint=keep_average(Percona Server)

MySQL and SSD

DoubleWrite area is important

MySQL and SSD

DoubleWrite is a protection

MySQL and SSD

DoubleWrite is rewriting the same area

MySQL and SSD

Rewrites of the same area

MySQL and SSD

Consider moving doublewrite • Innodb_doublewrite_file =• Percona Server

• ibdata1• For general MySQL

MySQL and SSD

Fusion-io to support atomic writes1.5x performance improvement

MySQL and SSD

Misc

MySQL and SSD

Misc filesystem

MySQL and SSD

Is Flash expensive?

MySQL and SSD

Consolidation

MySQL and SSD

Power savings

MySQL and SSD

New Relic

MySQL and SSD

Dell PowerEdge R610

Dell PowerVault MD1220

MySQL and SSD

Perc H800RAID511 Intel 320 SSD 600GB

MySQL and SSD

6xtimes difference

Scale Up, not Scale Out

MySQL and SSD

“Flash made everything faster, but more confusing”

MySQL and SSD

Pictures credits• http://

www.sunrainet.com/hdd-vs-ssd-speed-test-video-windows-7-boot-up.html• http://blog.familytreemagazine.com/insider/content/binary/datacenter-2.jpg

MySQL and SSD

Thank you!

MySQL and SSD