Add Offline button for faulted devices
Tested with 11.0-U1
In the Storage Volumes tab, if you click on the volume, and then the Volume status button, you can see all the component devices which make up a vdev.
If you click on a component device, then you can click offline.
But if the component device is faulted, then you can not.
You should be able to.
The reason is because if you wish to replace a faulted device with itself, then you have to offline the device, quick wipe it, and then replace the offlined device with the now wiped drive. You might do this if you have run a long test over the drive, and the drive appears okay, and you suspect the issue which caused the faulted device was not due to the device per-se, either way, you want to retry the device.
Without the ability to offline a faulted device in the GUI, you need to offline it via the CLI. The rest of the steps can be done in the UI. Without offlining, you can't wipe the drive without unmounting the pool.
An example of this situation:
root@rhea:~ # zpool status tank pool: tank state: DEGRADED status: One or more devices are faulted in response to persistent errors. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Replace the faulted device, or use 'zpool clear' to mark the device repaired. scan: scrub repaired 88K in 5h11m with 0 errors on Sun Jun 18 05:11:13 2017 config: NAME STATE READ WRITE CKSUM tank DEGRADED 0 0 0 raidz2-0 DEGRADED 0 0 0 gptid/e16ecdcb-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 gptid/e24c858c-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 gptid/e3250ec0-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 gptid/e3e200ca-86f2-11e6-bb77-001cc0071f3f FAULTED 0 123 0 too many errors gptid/e4b6d326-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 errors: No known data errors
because I can't offline the faulted device via UI, I now have to do it via CLI:
root@rhea:~ # zpool offline tank gptid/e3e200ca-86f2-11e6-bb77-001cc0071f3f
and you can see the device has successfully been offlined.
root@rhea:~ # zpool status tank pool: tank state: DEGRADED status: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected. action: Determine if the device needs to be replaced, and clear the errors using 'zpool clear' or replace the device with 'zpool replace'. see: http://illumos.org/msg/ZFS-8000-9P scan: scrub repaired 88K in 5h11m with 0 errors on Sun Jun 18 05:11:13 2017 config: NAME STATE READ WRITE CKSUM tank DEGRADED 0 0 0 raidz2-0 DEGRADED 0 0 0 gptid/e16ecdcb-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 gptid/e24c858c-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 gptid/e3250ec0-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 2223584477133409854 OFFLINE 0 123 0 was /dev/gptid/e3e200ca-86f2-11e6-bb77-001cc0071f3f gptid/e4b6d326-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 errors: No known data errors
And now, when I wipe/replace via the GUI, it begins resilvering.
pool: tank state: ONLINE status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the resilver to complete. scan: resilver in progress since Tue Jul 18 13:44:02 2017 145M scanned out of 8.74T at 7.62M/s, 334h12m to go 27.0M resilvered, 0.00% done config: NAME STATE READ WRITE CKSUM tank ONLINE 0 0 0 raidz2-0 ONLINE 0 0 0 gptid/e16ecdcb-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 gptid/e24c858c-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 gptid/e3250ec0-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0 gptid/4dfc43ea-6b6b-11e7-bea4-001cc0071f3f ONLINE 0 0 0 (resilvering) gptid/e4b6d326-86f2-11e6-bb77-001cc0071f3f ONLINE 0 0 0
I'll check the results, and scrub etc, and keep an eye on the drive, and if it faults again, I'll replace it (as its <12 months old), but as the SMART results aren't showing any errors, I can't currently easily RMA, until I prove a drive fault.
I haven't checked if this is supported in the new UI, but if it isn't it should be too.
#3 Updated by Stuart Espey over 1 year ago
Dru Lavigne wrote:
So, I'm working through my little disk problem, and I was able to reproduce it again. (FWIW, I believe its a backplane issue)
It appears the right approach to clear the faulted case is to run zpool clear. As soon as that is executed, the FAULTED device is switched to ONLINE and begins resilvering.
So, is there a way in the GUI to clear the status of a pool?
#4 Updated by William Grzybowski over 1 year ago
- Status changed from Unscreened to Screened
- Target version set to 11.2-BETA1
While Offline'ing a device in that case is possible your procedure does not make any sense to me.
If such a thing happens the correct way to repair is to scrub the pool, as opposed to offline a disk, wipe it and replace. It has absolutely no advantage.
zpool clear is also simply masquerading the problem, it assumes you have actually replaced something.
I suggest you to read more about ZFS to understand how it works, oracle has a nice documentation.
I'll enable Offline button for faulted disks, although thats not a recommended approach.