I re-did my benchmarks of my ZFS ZIL using a Crucial m500. The main reason I got this drive is that it has power-loss protection. And, it’s speeds are adequate to keep up with my gigabit Ethernet samba server.
Here are the results. My first run was decent, but not stellar:
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2014-04-11 23:32:15,079 - 16777216000 bytes written in 192.07929635047913 seconds 87.345259581685 MB/s |
I didn’t do a [ccie]zpool iostat[/ccie] during this run. This matches around what I was getting as a 4k random write. My second run was much better:
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2014-04-11 23:35:22,221 - 16777216000 bytes written in 136.14709854125977 seconds 123.22859744907173 MB/s |
And it matches a typical zpool iostat:
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capacity operations bandwidth pool alloc free read write read write ------------------- ----- ----- ----- ----- ----- ----- tank 5.17T 2.71T 0 2.96K 0 262M raidz1 5.17T 2.71T 0 1.13K 0 137M gpt/TOSH-3TB-A - - 0 565 0 68.7M gpt/TOSH-3TB-B - - 0 565 0 68.7M gpt/SGT-USB-3TB - - 0 563 0 68.7M logs - - - - - - gpt/tank_log0 1.56G 30.2G 0 1.83K 0 125M cache - - - - - - gpt/tank_cache0 24.5G 150G 0 632 3.15K 78.5M ------------------- ----- ----- ----- ----- ----- ----- |
Overall, I’m pretty happy. I was hoping to get at minimum 125 MB/s, which my gigabit Ethernet can’t really saturate.
I can now even try turning on forced sync writes in Samba.
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