On 3/5/15 11:05 AM, Harry wrote: > Thanks for the reply Eric. > > One of our problems is that we're limited in terms of what > manipulations we can apply to the live system, and so instead we've > been running our experiments against the backup system, and you're > quite right that DRBD may be introducing some weirdness of its own, > so those experiments may not be safe to draw conclusions from. > > Here's what we know about the live system > -> it had an outage, equivalent to having its power cable yanked, or doing an 'echo b > /proc/sysrq-trigger' > -> when it came back, it decided to mount the drive without quotas. > -> we saw a message in syslog saying " Failed to initialize disk quotas" > -> last time we had to run a quotacheck (several months ago) it took about 2 hours. > > We can repro the quotacheck issue on our test clusters, as follows: > -> kick off a job that writes to the disk > -> hard reboot with "echo b > /proc/sysrq-trigger" > -> on next boot, see "Failed to initialize disk quotas" message, xfs mounts without quotas > -> soft reboot with "reboot" > -> on next boot, see "Quotacheck needed: Please wait." message. > -> Quotacheck completes some time later. > > So our best-case scenario is that, next time we reboot, we'll have an > outage of about 2 hours. And our paranoid worst-case scenario, > induced by our experiments with our drbd backup drives, are that the > disk will actually turn out not to be mountable at all. > > is that "quotacheck always required after hard reboot" behaviour that > we're observing something you expected? you seemed to be saying that > the fact that quota are journaled should mean it's not needed? In general, that's correct. It's not clear why "Failed to initialize disk quotas" appeared; that seems closer to the root cause. But again, we don't have your full logs to look at, I don't know if anything else offers a clue. (For that matter, we don't even know what kernel version you're on...) here, on a recent 4.0-rc1 kernel: # mount -o quota /dev/sdc6 /mnt/test # cp -aR /lib/modules/ /mnt/test # echo b > /proc/sysrq-trigger [152807.209688] sysrq: SysRq : Resetting ... <reboots> # mount -o quota /dev/sdc6 /mnt/test # dmesg | tail -n 3 [ 90.822601] XFS (sdc6): Mounting V4 Filesystem [ 90.921346] XFS (sdc6): Starting recovery (logdev: internal) [ 93.399133] XFS (sdc6): Ending recovery (logdev: internal) # -Eric _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
