On Fri, Feb 27, 2015 at 10:07 PM, Mike Wright <nobody@xxxxxxxxxxxxxxxxxxxx> wrote: > > I'd like to see it stay open. The OP was not trolling and is obviously in > desperate need of a solution. I'm sure every one of us has lost critical > data at one time or another. > I suggested closing this thread mainly because there were already a bunch of replies on the centos list and seemed the best place to carry on the discussion rather than fragmenting it. I went ahead and tried to replicate the conditions (idealistically) in a VM, with XFS, ext4, and Btrfs and simulated the failure. tl;dr Btrfs faired the best by far permitting all data on surviving drives to be copied off; the ext4 fs imploded at the first ls command and nothing could be copied so it's a scrape operation, and XFS copied ~1/7 of the data, even though 3/4 of the drives were working. The main solution, I think, in the LVM dead PV case is this command: # vgchange -a y --activationmode partial This makes the LV active with the PV missing. The least amount of change in a case like this, the better, in order to avoid user induced data loss (really, really common), so I don't recommend removing or replacing the dead PV. If the LV type were mirror (legacy) or raid1, then it would be a different story altogether. Details are in the CentOS thread I previously included the URL for. > LVM is still considered arcane by many and any shared wisdom regarding OP's > situation would accrue greatly to our cumulative knowledge base. Quite. > I can attest that I once lost a volume that was so important to me that I > got sick to my stomach. I am loathe to wish that upon anyone. Backups! -- Chris Murphy -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines Have a question? Ask away: http://ask.fedoraproject.org
