I've been suffering from an extreme slowdown of the various lvm commands during high I/O load ever since updating from Fedora 15 to 16. I notice this particularly Sunday AMs when Fedora kicks of a raid-check. What is normally near instantaneous, commands like lvs and lvcreate --snapshot take minutes to complete (literally). This causes my backup jobs to timeout and fail. While all this is going on, the various filesystems are reasonably responsive (considering the raid-check is running) and I can read/write to files without problems. It seems that this slow-down is unique to lvm. I have three raid 5 arrays of 8, 6, and 6 drives. The root fs sits entirely within the 8 disk array as does the spare area used for snapshots. Interestingly, perhaps, if I can coax a backup into running, the lvs command, for example, will complete in just 15-30 seconds instead of 120-180s. It would seem that the random I/O of the backup is able to break things up enough for the lvm commands to squeeze in. I'm at a loss for what to do about this or what data to scan for clues. Any suggestions? kernel 3.2.10-3.fc16.x86_64 lvm> version LVM version: 2.02.86(2) (2011-07-08) Library version: 1.02.65 (2011-07-08) Driver version: 4.22.0 --Larkin _______________________________________________ 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/
