On Oct 24, 2006, at 4:56 AM, Michel Kintz wrote:
It is not always a matter of more redundancy.
In my customer's case, they have storage in 2 different rooms of
their datacenter and want to mirror from one storage unit in one
room to the other.
So having in this case a combination of RAID-Z + Mirror makes sense
in my mind .... or ?
It /does/ make sense. Having a geographically diverse storage
scenario like this is good, but changes the rules a bit, and in a way
that you can't fully take advantage of by using only soft RAID such
as ZFS or SVM. The missing link as you point out is the missing
ability to mirror (within the ZFS) a RAIDZ vdev.
To get around this, I just use hardware RAID5 on my separate arrays
and use either ZFS or SVM mirroring between the two on the hosts. I
have thought about this over the past several months, and believe
that it's probably better this way rather doing it all in ZFS or SVM.
/dale
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