On Sat, Nov 13, 2010 at 6:03 PM, Lars Ellenberg <lars.ellenberg@linbit.com> wrote: > On Sat, Nov 13, 2010 at 04:45:36PM -0500, Stirling Westrup wrote: ... >> All I want to do is move physical extents from one physical volume to >> another. Both of those volumes are present and accessible. Why should >> uninvolved missing volumes be an issue, and is there any way around >> it? pmmove suggests running "vgreduce --removemissing" but the >> documentation for vgreduce seems to say that I'd need to 1) use >> --force and 2) it would likely result in data loss. >> >> Is there anything I can do, short of borrowing another storage array >> somewhere, just so I can have an extra slot to do this move? My other >> option is to put the new drive into a USB case, but the server only >> supports USB1, so moving a terrabyte will take over a week. >> > If you do it offline anyways: > > Shut down. > Unplug one of the good old drives, plug in the new drive. > If you want to be extra sure against typos, > unplug all but the bad-old drive ;-) > > Boot into maintenance mode, use a live-cd if you have to. > > Don't activate the VG. It won't activate with one pv missing anyways, > unless you really want it to. > > Then dd_rescue copy the disk image from bad-old to new, including > everything (partition table, if any, LVM signature, the full image). > > Remove bad-old drive, have all other old and the new plugged, > reboot normally. > > Done. > > Estimated downtime, assuming a sustained linear write speed of 80 MiB/s: > 1 TiB / (80 MiB/s), well under 4 hours. > Thanks. I did consider this, but the new drive is twice the size of the old one, so I would need to make sure I had created a partition on the new drive the exact size of the old one, and had dd-ed everything correctly. Even then, I wasn't sure if it would work, because I don't know what the metadata records in terms of the drive configurations. -- Stirling Westrup Programmer, Entrepreneur. https://www.linkedin.com/e/fpf/77228 http://www.linkedin.com/in/swestrup http://technaut.livejournal.com _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
