June 23rd, 2009

memorex

ZFS and RAIDZ performance

A comment on the Ars Technica Linux Kung Fu forum a couple of weeks ago got me curious - a user there said that as far as he knew, RAIDZ was not supposed to be a performance configuration, with RAIDZ performance not much better, on average, than that of any single disk in the RAIDZ.

I just happened to have a RAID storage server in the shop that was due for a complete wipe anyway, so I decided to take the opportunity to do some benchmarking. Somewhat to my surprise, ZFS turned out to be quite a good performer - despite its advanced data-protection features, it was the fastest filesystem tested for single-process reads, with or without RAIDZ. RAIDZ did quite well too; on multiple concurrent reads it is significantly slower than RAID5/ext3, but still manages to nearly double single-drive performance across the board.



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perfect coffee

Jane pic du jour



She is super extra cranky and driving her mother to distraction right now, but omg she was so sweet this morning. And for, you know, like 15 brief minutes earlier tonight after I got home. :)