comment below...
Jason J. W. Williams wrote:
Hi Richard,
Originally, my thinking was I'd like drop one member out of a 3 member
RAID-Z and turn it into a RAID-1 zpool.
Although, at the moment I'm not sure.
Currently, I have 3 volume groups in my array with 4 disk each (total
12 disks). These VGs are sliced into 3 volumes each. I then have two
database servers using one LUN from each of the 3 VGs RAID-Z'd
together. For redundancy its great, for performance its pretty bad.
One of the major issues is the disk seek contention between the
servers since they're all using the same disks, and RAID-Z tries to
utilize all the devices it has access to on every write.
What I thought I'd move to was 6 RAID-1 VGs on the array, and assign
the VGs to each server via a 1 device striped zpool. However, given
the fact that ZFS will kernel panic in the event of bad data I'm
reconsidering how to lay it out.
Essentially I've got 12 disks to work with.
Anyway, long form of trying to convert from RAID-Z to RAID-1. Any help
is much appreciated.
No such conversion-in-place is possible, today.
The concensus for databases, such as Oracle, is that you want your
logs on a different zpool than your data. The simplest way to implement
this with redundancy is to mirror the log zpool. You might try that
first, before you relayout the data.
-- richard
Best Regards,
Jason
On 11/28/06, Richard Elling <[EMAIL PROTECTED]> wrote:
Jason J. W. Williams wrote:
> Is it possible to non-destructively change RAID types in zpool while
> the data remains on-line?
Yes. With constraints, however. What exactly are you trying to do?
-- richard
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