My sql ssd-mysqluc-2012
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MySQL and SSD
Vadim Tkachenko
Percona Inc, co-founder, CTO
www.percona.com
www.SSDPerformanceBlog.com
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This talk online
•PowerPoint
•http://bit.ly/MySQL-SSD-2012
•http://bit.ly/MySQL-SSD-2012-PDF
•Contacts
•Twitter @VadimTk
MySQL and SSD
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World is spinning
MySQL and SSD
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Physical limits
MySQL and SSD
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Rotate faster
7200 RPM
10000 RPM
15000 RPM
Kaboom
MySQL and SSD
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milliseconds
Access time
MySQL and SSD
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More spindles
MySQL and SSD
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Still milliseconds
MySQL and SSD
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Access time
MySQL and SSD
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MySQL and SSD
Data fits into
memory
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10% data growth
70% throughput drop
MySQL and SSD
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Flash Access time
MySQL and SSD
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MySQL throughput with Flash
MySQL and SSD
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Flash
MySQL and SSD
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MySQL and SSD
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Erase size
MySQL and SSD
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Write once
MySQL and SSD
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Write Erase
•slow
MySQL and SSD
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No rewrites
MySQL and SSD
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MySQL and SSD
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Garbage collector
MySQL and SSD
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Write amplification
Flash writes more than application
MySQL and SSD
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Software matters
MySQL and SSD
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Hardware is less important
MySQL and SSD
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MySQL and SSD
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Flash quality is defined by software
Log-structured file system
Wear leveling
Garbage collector
MySQL and SSD
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Flash types
SLC MLC
MySQL and SSD
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Single Level Cell – 1bit
Erase
0
1
MySQL and SSD
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Multi Level Cell – 2 bit
Erase
00
01
10
11
MySQL and SSD
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Multi Level Cell – 3 bit
Erase
000
001
010
011
100
101
110
111
MySQL and SSD
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SLC vs MLC
MySQL and SSD
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Erase cycles
MySQL and SSD
• SLC 100.000 cycles
• MLC 10.000 cycles
• 25nm MLC 5.000 cycles
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SLC
Benefits
• Reliability
• Performance
Drawbacks
• Up to 800GB
• Expensive
• 30-50$/GB
MySQL and SSD
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MLC
•Over 1TB
•10-15$/GB
•Life time
•Reliability
MySQL and SSD
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Space provisioning – Virident FlashMax 1400
MySQL and SSD
User space
1.4TB
Internal Space
0.6TB
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SATA vs PCI Express
MySQL and SSD
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SATA SSD
MySQL and SSD
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My benchmarks story
2 Intel 320 SSD cards
MySQL and SSD
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How do I install it?
MySQL and SSD
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I need
Space Power
Controller +cables
MySQL and SSD
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Initial setup
MySQL and SSD
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Polished setup - AccuSTOR AS108X
MySQL and SSD
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RAID controllers
LSI 9260 LSI 9211
MySQL and SSD
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Last component - cable
LSI - SFF8087
Enclosure - SFF8088
MySQL and SSD
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PCIe is different
MySQL and SSD
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PCIe
MySQL and SSD
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Just plug into a PCIe slot
But SATA is hot-swap
MySQL and SSD
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Benchmarks lie
MySQL and SSD
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Benchmark challenge: internal state
MySQL and SSD
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Benchmark challenge: capacity
MySQL and SSD
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Unrepeatable results
MySQL and SSD
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Benchmark challenge: filesystems
Ext3/4 – synchronous IO
“bug” in O_DIRECT
MySQL and SSD
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Benchmark challenge: filesystems
xfs - asynchronous
“bug” - serialization
MySQL and SSD
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Xfs already fixed bug in source
code
4x improvement
MySQL and SSD
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Benchmark challenge: filesystems
btrfs – not ready yet
MySQL and SSD
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To add to confusion: in MySQL
Reads - sync Writes –
async
Readahead reads - async
MySQL and SSD
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Ext4 vs xfs – your choice
MySQL and SSD
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Comparing apples
• 2.5” 15K RPM HP Smart Array
8xHDD RAID10
• SATA SLC
STEC MACH16 200GB
• RAID10 – LSI 9211-4i
4xSTEC MACH16
• SATA MLC
Intel 320 SSD 160GB
• PCIe MLC
Virident FlashMax 1400
MySQL and SSD
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Flash vendors
~50 on market
MySQL and SSD
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Random 16KiB reads
MySQL and SSD
50
222
417
195
1300
0
200
400
600
800
1000
1200
1400
MiB
/ s
ec
8 HDD
STEC
4 STEC
Intel
Virident
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Random 16KiB writes
MySQL and SSD
35
135
223
92
520
0
100
200
300
400
500
600
MiB
/ s
ec
8 HDD
STEC
4 STEC
Intel
Virident
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Price
MySQL and SSD
24001500
6000
270
18000
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
Pri
ce, $
8 HDD
STEC
4 STEC
Intel
Virident
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PCIe vs SATA
Which one to choose?
MySQL and SSD
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PCIe for absolute performance
I use it because I have free samples
MySQL and SSD
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SATA for performance per $
I would use it if I had to buy…
MySQL and SSD
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When should I use flash?
MySQL and SSD
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Very good for random reads
Both SLC and MLC
MySQL and SSD
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Random Writes
Maybe challenge for MLC
MySQL and SSD
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SLC lifetime
20 years?
MySQL and SSD
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MLC lifetime
8PB 15PB
MySQL and SSD
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Write amplification
Flash writes more than application
MySQL and SSD
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Experiment – tpcc-mysql
Virident FlashMAX 1400
Write amplification: 1.143
1125.65 GiB writes per hour
Lifetime: 1.52 years
MySQL and SSD
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Flash for MySQL
MySQL and SSD
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When Flash helps
Low-latency requirement
Joins, large tables, mixed workloads, replication
High throughput workloads
High concurrency workloads
MySQL and SSD
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Most important decision
MySQL version
MySQL and SSD
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MySQL 5.1 with builtin InnoDB
Not good
MySQL and SSD
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You need
Multiple IO threads
Async
MySQL and SSD
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Choices
Percona Server 5.5
MySQL 5.5
Percona Server 5.1
MySQL and SSD
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Benchmarks again
MySQL and SSD
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Percona Server 5.5
4x STEC MACH16 RAID10
• LSI 9211
• LSI 9260 – with cache
Sysbench oltp
• 100GB database, 50GB memory
MySQL and SSD
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STEC SSD vs HDD: 8x gain
MySQL and SSD
750
90
0
100
200
300
400
500
600
700
800
SSD HDD
tps
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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
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MySQL IO workloads
MySQL
InnoDB data
InnoDB redo logs
Binary logs
InnoDB system tablespace
MySQL and SSD
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innodb_flush_log_at_trx_commit=1
Location matters
SSD
RAID with cache
MySQL and SSD
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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
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STEC – RAID card
MySQL and SSD
750810
0
100
200
300
400
500
600
700
800
900
LSI 9211 (no cache) LSI 9260 (with cache)
tps
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Log size matters
MySQL and SSD
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Big log file 8GB (Percona Server)
MySQL and SSD
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Flushing algorithm is important
MySQL and SSD
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Innodb_adaptive_checkpoint=keep_average
(Percona Server)
MySQL and SSD
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DoubleWrite area is important
MySQL and SSD
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DoubleWrite is a protection
MySQL and SSD
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DoubleWrite is rewriting the same area
MySQL and SSD
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Rewrites of the same area
MySQL and SSD
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Consider moving doublewrite
• Innodb_doublewrite_file =
• Percona Server
• ibdata1
• For general MySQL
MySQL and SSD
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Fusion-io to support atomic
writes
1.5x performance improvement
MySQL and SSD
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Misc
innodb_flush_neighbor_pages= ON | OFF
innodb_log_block_size = 512 | 4096
MySQL and SSD
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Misc filesystem
Mkfs.xfs –s size=4096
Mount –o nobarrier
MySQL and SSD
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Is Flash expensive?
MySQL and SSD
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Consolidation
MySQL and SSD
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Power savings
MySQL and SSD
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New Relic
MySQL and SSD
Dell PowerEdge R610
Dell PowerVault MD1220
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MySQL and SSD
Perc H800 RAID5
11 Intel 320 SSD 600GB
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MySQL and SSD
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Scale Up, not Scale Out
MySQL and SSD
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“Flash made everything faster,
but more confusing”
MySQL and SSD
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Pictures credits
• http://www.sunrainet.com/hdd-vs-ssd-speed-test-video-
windows-7-boot-up.html
• http://blog.familytreemagazine.com/insider/content/binary/datace
nter-2.jpg
MySQL and SSD