[geeks] Pure ZFS machine - possible?
velociraptor at gmail.com
Thu Nov 9 17:14:48 CST 2006
On 11/9/06, Mike Meredith <very at zonky.org> wrote:
> On Thu, 9 Nov 2006 15:34:27 -0700 (MST), Dan Duncan wrote:
> > I goofed with ZFS a bit to try it out. I liked it and it was pretty
> > easy to manage but I was initially told it offered scalable raid5
> > like storage and as far as I can tell it doesn't. If I create a
> > raidZ container of say 5 disks and then later expand it by one, it
> > just concatenates the filesystem across the 5-disk raidZ and the
> It's probably a very difficult problem to enlarge a raid5 (or raidz)
> vdev non-destructively. The only storage vendor I know of that offers
> anything like that is NetApp and they use RAID4 to allow this.
I believe the Infrant ReadyNAS will go from a 3 disk RAID 5 to a 4
disk RAID 5 non-destructively, so it is possible without shelling out
for NetApp (not that I discourage doing so :-). I thought it was
possible in Solaris VM and VxVM as well, but could be mis-remembering.
I haven't touched software RAID 5 in a long while.
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