Hi Mark,
Mark J Musante wrote:
> On Tue, 10 Apr 2007, Constantin Gonzalez wrote:
>
>> Has anybody tried it yet with a striped mirror? What if the pool is
>> composed out of two mirrors? Can I attach devices to both mirrors, let
>> them resilver, then detach them and import the pool from those?
>
> You'd want to export them, not detach them. Detaching will overwrite the
> vdev labels and make it un-importable.
thank you for the export/import idea, it does sound cleaner from a ZFS
perspective, but comes at the expense of temporarily unmounting the filesystems.
So, instead of detaching, would unplugging, then detaching work?
I'm thinking something like this:
- zpool create tank mirror <dev1> <dev2> <dev3>
- {physically move <dev3> to new box}
- zpool detach tank <dev3>
On the new box:
- zpool import tank
- zpool detach tank <dev1>
- zpool detach tank <dev2>
This should work for one disk, and I assume this would also work for multiple
disks?
Thinking along similar lines, would it be a useful RFE to allow asynchronous
mirroring like this:
- <dev1>, <dev2> are both 250GB, <dev3> is 500GB
- zpool create tank mirror <dev1>,<dev2> <dev3>
This means that half of dev3 would mirror dev1, the other half would mirror dev2
and dev1,dev2 is a regular stripe.
The utility of this would be for cases where customer have set up mirrors, then
need to replace disks or upgrade the mirror after a long time, when bigger disks
are easier to get than smaller ones and while reusing older disks.
Best regards,
Constantin
--
Constantin Gonzalez Sun Microsystems GmbH, Germany
Platform Technology Group, Global Systems Engineering http://www.sun.de/
Tel.: +49 89/4 60 08-25 91 http://blogs.sun.com/constantin/
Sitz d. Ges.: Sun Microsystems GmbH, Sonnenallee 1, 85551 Kirchheim-Heimstetten
Amtsgericht Muenchen: HRB 161028
Geschaeftsfuehrer: Marcel Schneider, Wolfgang Engels, Dr. Roland Boemer
Vorsitzender des Aufsichtsrates: Martin Haering
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