Alin Dobre posted on Mon, 27 Jan 2014 11:43:33 +0000 as excerpted: > I am trying to create a very simple script that would alert in case of > disk failures from a RAID Btrfs. > > Digging into the code, I have noticed that the "btrfs fi sh" command > should display a warning if there is a missing disk. However, testing in > a Qemu, I used "drive_del" via QMP to remove a "live" SCSI drive, > already mounted as part of a RAID10 array, the "fi sh" command still > gave no indication that the drive is missing. Then, I tried removing a > scsi disk from the host via "echo 1 >/sys/block/sdX/device/delete" to > actually make the kernel SCSI host forget about it, and "fi sh" still > doesn't show anything. > > I have tested using btrfs-progs v3.12 and kernel 3.13.0.
Without actually trying it here... I believe by default that'd update only when there was an I/O error. Did you try btrfs filesystem show --all-devices? That scans differently. If that doesn't work try btrfs device scan first as that updates the in- kernel list, then filesystem show. Alternatively, monitor the kernel log for output as the scanned devices show up there. And if /that/ doesn't work, try show, followed by a probe of all the devices listed by show. But I strongly suspect a device scan will force the update you're looking for. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
