On 06/01/2017 17:09, Miroslav Lachman wrote: > Andriy Gapon wrote on 2017/01/06 11:12: >> On 06/01/2017 11:54, Andriy Gapon wrote: >>> >>> Can a geom mirror handle a member that gets disconnected and then reappears >>> again? >>> >>> What I am seeing right now is that the mirror does not pick up the member >>> when >>> it reappears. I have to add it back manually. > > It is intentional to mark disappeared device as broken. > If you want to remove working device from gmirror, you must use gmirror remove > command (or gmirror deactivate). > >> To add more substance, here is what gets logged when the disk disappears: >> >> GEOM_MIRROR: Request failed (error=6). ada0p2[READ(offset=2517700608, >> length=4096)] >> GEOM_MIRROR: Device swap: provider ada0p2 disconnected. >> >> And here's what gets logged when the disk reappears: >> GEOM_MIRROR: Component ada0p2 (device swap) broken, skipping. >> GEOM_MIRROR: Cannot add disk ada0p2 to swap (error=22). > > Was the disk removed by user or was it by some bad event?
The latter. I suspect some problem with an SSD's controller or firmware. Basically, the disk disappeared and then re-appeared half a minute later. > >>> Even worse, the commands I have >>> to execute are: >>> $ gmirror forget ... >>> $ gmirror insert ... >>> >>> This does not appear to be a graceful way of reactivating the member. > > You can re-activate only member which was correctly deactivated. Not one > yanked > out without any "graceful" command. I see. > And as gmirror doesn't work as ZFS mirror (cannot do resilver) the re-added > device is always fully rebuilt. Indeed. But it would be nice if gmirror was able to handle my situation automatically: - when a disk disappears, mark it broken (missing to be more precise) - when it re-appears, rebuild it and add back to the mirror It seems that the main problem at the moment is that gmirror doesn't distinguish between a disk getting many errors (e.g. disk going bad) and a disk disappearing (maybe permanently, maybe temporarily). But I could be mistaken about this. -- Andriy Gapon _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-geom To unsubscribe, send any mail to "[email protected]"
