ZfS & GEOM with many odd drive sizes

[Mark Powell]

On Wed, 25 Jul 2007, Doug Rabson wrote:

>> gmirror is only going to used for the ufs /boot parition and block device 
>> swap. (I'll ignore the smallish space used by that below.)
>
> Just to muddy the waters a little - I'm working on ZFS native boot code at 
> the moment. It probably won't ship with 7.0 but should be available shortly 
> after.

Great work. That will be zfs mirror only right?

>>  I believe my reasoning is correct here? Let me know if your experience 
>> would suggest otherwise.
>
> Your reasoning sounds fine now that I have the bigger picture in my head. I 
> don't have a lot of experience here - for my ZFS testing, I just bought a 
> couple of cheap 300GB drives which I'm using as a simple mirror. From what I 
> have read, mirrors and raidz2 are roughly equivalent in 'mean time to data 
> loss' terms with raidz1 quite a bit less safe due to the extra vulnerability 
> window between a drive failure and replacement.

So back to my original question :)
   If one drive in a gconcat gc1 (ad2s2+ad3s2), say ad3 fails, and the 
broken gconcat is completely replaced with a new 500GB drive ad2, is 
fixing that as simple as:

zpool replace tank gc1 ad2

Many thanks.

-- 
Mark Powell - UNIX System Administrator - The University of Salford
Information Services Division, Clifford Whitworth Building,
Salford University, Manchester, M5 4WT, UK.
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