Date: Fri, 7 Jul 2006 08:06:34 -0400 From: John Nielsen <lists@jnielsen.net> To: freebsd-questions@freebsd.org Cc: Olivier Nicole <on@cs.ait.ac.th>, questions@freebsd.org Subject: Re: Creating vinum RAID 1 on place Message-ID: <200607070806.35144.lists@jnielsen.net> In-Reply-To: <200607070804.13892.lists@jnielsen.net> References: <200607070429.k674TkjX027354@banyan.cs.ait.ac.th> <200607070804.13892.lists@jnielsen.net>
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On Friday 07 July 2006 08:04, John Nielsen wrote: > On Friday 07 July 2006 00:29, Olivier Nicole wrote: > > Is there a trick on the way to build a vinum RAID 1 without backup-in > > the data first? > > > > I have the two disk that will get mirrored. One of the disk if > > formated as UFS 4.2 and already holds all the data. The second disk is > > blank. > > > > NormallyI should start with 2 blank disks, label them as vinum, create > > the vinum plex, then push the data on that RAID. Is there a way to do > > it without blanking both disk first (a RAID 0 on a single disk, copy > > the data on the RAID 0), label the other disk as vinum and create a > > RAID1? > > This is quite possible. The 100% safe way would be to configure the blank > disk as the sole member of a (degraded) mirror set, use dump / restore to > transfer the data from the existing filesystem to the "mirror", then wipe > the old filesystem and add the original disk to the mirror. > > The faster but only 90% safe way would be to "gmirror label" the partition > containing the existing filesystem and then adding the second disk as a > member. This is not safe if the last sector of the existing provider (where > gmirror stores its metadata) is (or could be in the future) used by the > filesystem. Frequently the geometry works out such that there are spare > sectors at the end of a partition that are not used by newfs, but if you're > not sure then don't go this route. See the archives of this and other lists > for details about this situation. Sorry, I completely missed the "vinum" in your message the first time through. My comments above apply to GEOM mirroring (gmirror) and not to vinum. I would recommend gmirror over vinum for RAID 1, though, as it's much simpler to get going and at least as robust. JN
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