On 5-Feb-10, at 11:35 AM, J wrote:
Hi all,
I'm building a whole new server system for my employer, and I
really want to use OpenSolaris as the OS for the new file server.
One thing is keeping me back, though: is it possible to recover a
ZFS Raid Array after the OS crashes? I've spent hours with Google
to avail....
To be more descriptive, I plan to have a Raid 1 array for the OS,
and then I will need 3 additional Raid5/RaidZ/etc arrays for data
archiving, backups and other purposes. There is plenty of
documentation on how to recover an array if one of the drives in
the array fails, but what if the OS crashes? Since ZFS is a
software-based RAID, if the OS crashes is it even possible to
recover any of the arrays?
Being a software system it is inherently more recoverable than
hardware RAID (the latter is probably only going to be readable on
exactly the same configuration, and if the constellations are aligned
just right, and the black rooster has crowed four times, etc).
As Darren says, you can simply take either or both sides of the
mirror and boot or access the pool on another ZFS-capable system.
It doesn't even have to use the same interfaces; last week I built a
new Solaris 10 web server and migrated pool data from one half of a
ZFS pool from the old server, connected by USB/SATA adapter. This
kind of flexibility (not to mention data integrity) just isn't there
with HW RAID.
--Toby
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