MySQL and SSD. Vadim Tkachenko Percona Inc, co-founder, CTO
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1 Vadim Tkachenko Percona Inc, co-founder, CTO
2 Access time
3 Still milliseconds
4 Data fits into memory
5 10% data growth 70% throughput drop
6 Flash Access time
7 MySQL throughput with Flash
8 Flash
9
10 Erase size
11 Write once
12 Erase Write slow
13 No rewrites
14
15 Garbage collector
16 Write amplification Flash writes more than application
17 Software matters
18 Hardware is less important
19
20 Flash quality is defined by software Log-structured file system Wear leveling Garbage collector
21 Flash types SLC MLC
22 Erase cycles SLC cycles MLC cycles 25nm MLC cycles
23 SLC Benefits Reliability Performance Drawbacks Up to 800GB Expensive 30-50$/GB
24 MLC Over 1TB 5-13$/GB Life time Reliability
25 Space provisioning Virident FlashMax 1400 User space 1.4TB Internal Space 0.6TB
26 SATA vs PCI Express
27 SATA SSD
28 How do I install it?
29 I need Space Power Controller +cables
30 Initial setup
31 Polished setup - AccuSTOR AS108X
32 RAID controllers LSI 9260 LSI 9211
33 PCIe is different
34 PCIe
35 Just plug into a PCIe slot But SATA is hot-swap
36 PCIe vs SATA Which one to choose?
37 PCIe for absolute performance I use it because I have free samples
38 SATA for performance per $ I would use it if I had to buy
39 Benchmarks lie
40 Benchmark challenge: internal state
41 Benchmark challenge: capacity
42 Unrepeatable results
43 Comparing apples Intel SSD GB MLC ( 2 x 200GB) $2000 Amazon.com Micron RealSSD P320h 700GB MLC Virident FlashMax II 2.2 TB Fusion-io iodrive (1 st gen) 640GB MLC, Drivers 3.1.5
44 Flash vendors ~50 on market
45 Measurement every second
46 Median as final number
47 Random 16KiB writes Micron
48 Virident FlashMax II
49 MiB / sec Random 16KiB writes HDD RAID Intel SSD 910 Duo Micron P320h Fusion-io iodrive 2 Duo Fusion-io iodrive (1st) Virident FlashMax 2 Intel SSD 520 (SATA)
50 Random 16KiB reads - throughput
51 Random 16KiB reads response time
52 Read/writes Virident FlashMax II
53 When should I use flash?
54 Very good for random reads Both SLC and MLC
55 Random Writes Maybe challenge for MLC
56 SLC lifetime 20 years?
57 MLC lifetime 8PB 15PB
58 Write amplification Flash writes more than application
59 Experiment tpcc-mysql Virident FlashMAX 1400 Write amplification: GiB writes per hour Lifetime: 1.52 years
60 Flash for MySQL
61 When Flash helps Low-latency requirement Joins, large tables, mixed workloads, replication High throughput workloads High concurrency workloads
62 Most important decision MySQL version
63 MySQL 5.1 with builtin InnoDB Not good
64 You need Multiple IO threads Async
65 Choices Percona Server 5.5 MySQL 5.5/5.6 Percona Server 5.1
66 Benchmarks again
67 Percona Server Micron RealSSD P320h Intel SSD 910 Fusion-io iodrive (1 st gen) Tpcc-mysql workload 250GB database
68 Hardware Dell PowerEdge R720 2x Intel(R) Xeon(R) CPU 2.20GHz 192GB total RAM
69 Vary buffer_pool_size MySQL Memory (innodb_buffer_pool_size) 13GB, 75GB, 125GB ( database size 250GB) 13GB very intensive IO. A lot of reads from user threads (cache misses). Writes from dirty page (LRU) flushing 125GB light IO reads, havy background IO writes, mostly from flush_list (innodb_log_file_size is important) 75GB mix in the middle More on flushing: t-flavors-of-innodb-flushing/
70 Fusion-io. Full card vs 75% space
71 Innodb_log_file_size
72 Micron P320h / Intel 910 / Fusion-io (1 st gen)
73 Cards comparison Micron P320h 7x in RAW IO vs Intel SSD 910 2x in MySQL workload
74 Percona Server 5.5 vs MySQL 5.6
75 Percona Server 5.5 vs MySQL 5.6 Conclusions Flushing algorithm makes difference Buffer_pool_instances is important for MySQL 5.5/5.6 But tricky to figure out what is proper value
76 What about response time?
77 New bechmark methodology Sysbench oltp injection 2/25/introducing-new-type-of-benchmark/
78 Injection benchmark Request comes with given rate: N transactional per second by Exponential distribution, with λ = N Arrival example with 2 transactions per second:
79 Why do we need it?
80 What happens if card is uncapable
81 Sysbench, injection 1000 tps
82 Atomic writes
83 DoubleWrites in InnoDB
84 DoubleWrite is a protection
85 DoubleWrite is rewriting the same area
86 Rewrites of the same area
87 Consider moving doublewrite It is in ibdata1 file (innodb_file_per_table)
88 Fusion-io and atomic writes iomemory SDK DirectFS and API to avoid doublewrites Percona Server with iomemory API rcona-server-tree-with-support-of-fusion-io-atomicwrites-and-directfs/
89 atomic writes Write 16KB atomically
90 Transactions per 10 sec BP: 13 BP: 25 BP: 75 Fusion-io atomic writes / Percona Server ioMemory SDK / tpcc-mysql 1000W sd= sd= sd= sd= Filesystem ext4 DirectFS sd= sd= time, sec (10 sec interval) --->
91 MySQL parameters innodb_flush_neighbor_pages= ON OFF Innodb_log_file_size ~ 2x4GB innodb_adaptive_flushing=keep_average
92 Misc filesystem mount o nobarrier IO Scheduler: Deadline Someone needs to kill CFQ
93 Is Flash expensive?
94 Consolidation
95 Power savings
96 New Relic Dell PowerEdge R610 Dell PowerVault MD1220
97 Perc H800 RAID5 11 Intel 320 SSD 600GB
98
99 Scale Up, not Scale Out
100 Flash made everything faster, but more confusing
101 Pictures credits atacenter-2.jpg
102 Thank you! Questions? Flash is exciting!
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