Christopher Chan wrote:
On Saturday, June 08, 2013 05:23 AM, Paul B. Henson wrote:
For these large drives, raidz2 is recommended, as the likelihood of a
second drive failure during a rebuild starts to get pretty high.
What's wrong with striped mirrors? raidz2 does not like random i/o. I
happen to run raidz2 and regret it now.
Nothing much, it's just that 3TB drives can take a long time (days) to
resilver on a moderately busy pool and raidz leaves you exposed to a
second drive failure during that process.
There's still a risk of two dives in one mirror failing, but that would
be less than the raidz case.
If someone is willing to suffer the performance of raidz, raidz2 is
definitely a better choice!
--
Ian.
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