I got my hands on an m550 128GB drive (for around $75 with the recent pre-Thanksgiving/pre-Christmas discounts). Here are some comparisons between my old ZIL (the m500 128GB) and the new one: ZIL Throughput (sustained) MB/s none 195.6 m500 128GB 124.0 m550 128GB 265.9 Here are some snippets of zpool isotat output: No ZIL
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2014-11-25 22:07:33,635 - 16777216000 bytes written in 85.77223777770996 seconds 195.60193874713124 MB/s |
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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 […]
This is a follow-up on my previous post. I ran iozone both with and without the [ccie]-e[/ccie] flag. This flag includes a sync/flush in the speed calculations. This flush should tell ZFS to commit the in-process data to disk, thus flushing it to the SLOG device (or to the on-disk ZIL). I ran 4 tests: […]
Running List of Alternatives 2015-08-11 It looks from this Anandtech article that the m550 does not have as strong power-loss protection as I originally thought. It protects the “lower pages” (least-significant bits) from corruption between page writes. But, it does not protect the DRAM buffer from losing data. 2014-07-07 The Transcend MTS600 line is capable […]
Summary Version 1.96 Sequential Output Sequential Input Random Seeks Sequential Create Random Create Size Per Char Block Rewrite Per Char Block Num Files Create Read Delete Create Read Delete K/sec % CPU K/sec % CPU K/sec % CPU K/sec % CPU K/sec % CPU /sec % CPU /sec % CPU /sec % CPU /sec % […]
