[OpenIndiana-discuss] WD reds any good for ZFS RAIDZ pools?

[Ian Collins]

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.