Following my previous benchmark of Samsung 830, today I want to show results for STEC MACH16 SATA card, 200GB size, this card is based on SLC, and regarding STEC website, it is an enterprise grade storage.
For tests I use sysbench fileio, 16KiB block size (to match workload from InnoDB, as this is primary usage for me), and recently I switched to use async IO mode. There are two reasons for that. First, MySQL/InnoDB uses async writes, so this will emulate database load, and second, async mode allows to see maximal possible throughput, it does not show reliable latency though, as it appears there is no a reliable way in the Linux asynchronous IO library to get time metrics for particular IO block.
so my testing command line looks like:
sysbench --test=fileio --file-total-size=${size}G --file-test-mode=rndwr --max-time=18000 --max-requests=0 --num-threads=$numthreads --rand-init=on --file-num=64 --file-io-mode=async --file-extra-flags=direct --file-fsync-freq=0 --file-block-size=16384 --report-interval=10 run
You may see I gather metrics every 10 sec to see how stable the performance is, and it really helps to observe some artifacts, as you will see in following graphs.
Hardware for tests: HP ProLiant DL380 G6, filesystem: ext4, mounted with nobarrier.
The results for random write case (8 async IO threads):
In general it shows stable throughput topping to 148 MiB/sec, but every 20 sec, there is small drop to 87 MiB/sec, which I guess is related to internal garbage collector activity.
The results for random read case:
Very stable throughput on line 222 MiB/sec
To understand better what kind of response time we should expect, I ran random read sync IO mode, now for 1-64 threads.
The throughput:
We are getting to the peak throughput at 8 threads.
And response time:
For 8 threads, we may expect 0.62ms response time.
In general I have very good experience with this card, and it seems suitable to work with MySQL. I will publish sysbench oltp benchmarks running MySQL on RAID10 over 4 STEC MACH16 cards.
If you are interested more in SSD and MySQL questions – I will be giving a webinary “MySQL and SSD” on May-9. It will be the same as my talk on Percona Live MySQL Conference 2012, if you did not attend my talk – you are welcome to join the webinar.
Disclaimer: This benchmark is done as part of consulting work for STEC, but this post is totally independent and fully reflects our opinion.
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