Hi Francis, Thanks for confirming. That did the trick. I kept thinking I had to mirror at the highest level (zpool), then split. I actually did it in one less step than you mention by using replace instead of attach then detach but what you said is 100% correct.
zpool replace /root/zfs/disk0 /root/zfs/disk3 zpool detach /root/zfs/disk1 Thanks again! On Thu, Mar 26, 2009 at 7:00 PM, Francois Napoleoni < francois.napole...@sun.com> wrote: > Hi Matthew, > > Just attach disk3 to existing mirrored tlv > Wait for resilvering to complete > Dettach disk0 and disk1 > This will leave you with only disk3 in your pool. > You will loose ZFS redundancy fancy features (self healing, ...). > > # zpool create test mirror /export/disk0 /export/disk1 > # zpool status > pool: test > state: ONLINE > scrub: none requested > config: > > NAME STATE READ WRITE CKSUM > test ONLINE 0 0 0 > mirror ONLINE 0 0 0 > /export/disk0 ONLINE 0 0 0 > /export/disk1 ONLINE 0 0 0 > > errors: No known data errors > # zpool attach test /export/disk1 /export/disk3 > # zpool status > pool: test > state: ONLINE > scrub: resilver completed after 0h0m with 0 errors on Thu Mar 26 19:55:24 > 2009 > config: > > NAME STATE READ WRITE CKSUM > test ONLINE 0 0 0 > mirror ONLINE 0 0 0 > /export/disk0 ONLINE 0 0 0 > /export/disk1 ONLINE 0 0 0 > /export/disk3 ONLINE 0 0 0 71.5K resilvered > # zpool detach test /export/disk0 > # zpool detach test /export/disk1 > # zpool status > pool: test > state: ONLINE > scrub: resilver completed after 0h0m with 0 errors on Thu Mar 26 19:55:24 > 2009 > config: > > NAME STATE READ WRITE CKSUM > test ONLINE 0 0 0 > /export/disk3 ONLINE 0 0 0 71.5K resilvered > > errors: No known data errors > > F. > > > > On 03/26/09 08:20, Matthew Angelo wrote: > >> Assuming I have a zpool which consists of a simple 2 disk mirror. >> How do I attach a third disk (disk3) to this zpool to mirror the existing >> data? Then split this mirror and remove disk0 and disk1, leaving a single >> disk zpool which consist of the new disk3. AKA. Online data migration. >> >> >> >> [root]# zpool status -v >> pool: apps >> state: ONLINE >> scrub: none requested >> config: >> >> NAME STATE READ WRITE CKSUM >> apps ONLINE 0 0 0 >> mirror ONLINE 0 0 0 >> /root/zfs/disk0 ONLINE 0 0 0 >> /root/zfs/disk1 ONLINE 0 0 0 >> >> errors: No known data errors >> >> >> The use case here is, we've implemented new Storage. The new (3rd) LUN >> is a RAID10 Hitachi SAN with the existing mirror being local SAS Disks. >> Back in the VxVM world, this would be done by mirroring the dg then >> splitting the mirror. I understand we are moving away from a ZFS mirror to >> a single stripe. >> >> Thanks >> >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> zfs-discuss mailing list >> zfs-discuss@opensolaris.org >> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >> >
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