On Mar 28, 2009, at 5:22 PM, Bob Friesenhahn <bfrie...@simple.dallas.tx.us
> wrote:
On Sat, 28 Mar 2009, Michael Shadle wrote:
Well this is for a home storage array for my dvds and such. If I
have to turn it off to swap a failed disk it's fine. It does not
need to be highly available and I do not need extreme performance
like a database for example. 45mb/sec would even be acceptable.
I can see that 14 disks costs a lot for a home storage array but to
you the data on your home storage array may be just as important as
data on some businesses enterprise storage array. In fact, it may
be even more critical since it seems unlikely that you will have an
effective backup system in place like large businesses do.
Well I might back up the more important stuff offsite. But in theory
it's all replaceable. Just would be a pain.
Could I setup a raidz2 on the new zdev then destroy the old one and
then raidz2 that technically if I want? Then both sets would have
double redundancy, if I was feeling paranoid. But raid5 has served
people well for a long time... Is resilvering speed roughly the same
as a raid5 controller rebuild?
The main problem with raidz1 is that if a disk fails and you replace
it, that if a second disk substantially fails during resilvering
(which needs to successfully read all data on remaining disks) then
your ZFS pool (or at least part of the files) may be toast. The
more data which must be read during resilvering, the higher the
probability that there will be a failure. If 12TB of data needs to
be read to resilver a 1TB disk, then that
This is good info to know. I guess I'm willing to take the risk of a
resilver. It's got a dedicated quad core proc doing nothing else than
exporting samba and zfs... I wonder how long it would take.
In order to lessen risk, you can schedule a periodic zfs scrub via a
cron job so that there is less probabily of encountering data which
can not be read. This will not save you from entirely failed disk
drives though.
I do a weekly scrub and an fmadm faulty every 5 or 10 mins to email me
if anything comes up...
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