[EMAIL PROTECTED] wrote on 03/07/2007 12:31:14 PM:
> So it sounds like the consensus is that I should not worry about
> using slices with ZFS
> and the swap best practice doesn't really apply to my situation of a
> 4 disk x4200.
>
> So in summary(please confirm) this is what we are saying is a safe
> bet for using in a highly available production environment?
>
> With 4x73 gig disks yielding 70GB each:
>
> 5GB for root which is UFS and mirrored 4 ways using SVM.
> 8GB for swap which is raw and mirrored across first two disks
> (optional: or no liveupgrade and 4 way mirror this swap partition)
> 8GB for LiveUpgrade which is mirrored across the third and fourth two
disks
> This leaves 57GB of free space on each of the 4 disks in slices
> One zfs pool will be created containing the 4 slices
> the first two slices will be used in a zmirror yielding 57GB
> The last two slices will be used in a zmirror yielding 57GB
> Then a zstripe (raid0) will be layed over the two zmirrors yielding
> 114GB usable space while able to sustain any 2 drives failing
> without a loss in data
No, you will be able to sustain up to one disk in each of the two disk
pairs failing at any time with no data loss. Lose two disks in the mirror
pair set and you lose data (and system panic) -- slightly different then
"any two disks".
>
> Thanks
>
> P.S.
> Availability is determined by using a synthetic SLA monitor that
> operates on 2 minute cycles evaluating against a VIP by an external
> third party. If there are no errors in the report for the month we
> hit 100%, I think even one error (due to the 2 minute window) puts
> us below 6 9's..so we basically have a zero tolerance standard to
> hit the sla and not get penalized monetarily
>
>
> This message posted from opensolaris.org
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