[illumos-Developer] ZFS bug question

[Roy Sigurd Karlsbakk]

Hi all

Seems there's a bug in the OI/opensolaris ZFS implementation - see below. Any idea if this is fixed in newer code?

roy

----- Forwarded Message -----
Fra: "Mark Musante" <mark.musante at oracle.com>
Til: "Roy Sigurd Karlsbakk" <roy at karlsbakk.net>
Kopi: "ZFS filesystem discussion list" <zfs-discuss at opensolaris.org>, "Discussion list for OpenIndiana" <openindiana-discuss at openindiana.org>
Sendt: torsdag, 2. juni 2011 02:32:55
Emne: Re: [zfs-discuss] Another zfs issue


Yeah, this is a known problem. The DTL on the toplevel shows an outage, and is preventing the removal of the spare even though removing the spare won't make the outage worse.

Unfortunately, for opensolaris anyway, there is no workaround.

You could try doing a full scrub, replacing any disks that show errors, and waiting for the resilver to complete. That may clean up the DTL enough to detach the spare.

On 1 Jun 2011, at 20:20, Roy Sigurd Karlsbakk wrote:

> Hi all
>
> I have this pool that has been suffering from some bad backplanes etc. Currently it's showing up ok, but after a resilver, a spare is stuck.
>
>          raidz2-5     ONLINE       0     0     4
>            c4t1d0     ONLINE       0     0     0
>            c4t2d0     ONLINE       1     0     0
>            c4t3d0     ONLINE       0     0     0
>            c4t4d0     ONLINE       0     0     0
>            spare-4    ONLINE       0     0     0
>              c4t5d0   ONLINE       0     0     0
>              c4t44d0  ONLINE       0     0     0
>            c4t6d0     ONLINE       0     0     0
>            c4t7d0     ONLINE       0     0     0
>
> So, the VDEV seems ok, the pool reports two data errors, which is sad, but not a showstopper, however, trying to detach the spare from that vdev doesn's seem to easy
>
> roy at dmz-backup:~$ sudo zpool detach dbpool c4t44d0
> cannot detach c4t44d0: no valid replicas
>
> iostat -en shows some issues with drives in that pool, but none on the two in the spare mirror
>
>    0   0   0   0 c4t1d0
>    0  82 131 213 c4t2d0
>    0   0   0   0 c4t3d0
>    0   0   0   0 c4t4d0
>    0   0   0   0 c4t5d0
>    0   0   0   0 c4t6d0
>    0   0   0   0 c4t7d0
>    0   0   0   0 c4t44d0
>
> Is there a good explaination why I can't detach this mirror from the VDEV?
>
> Vennlige hilsener / Best regards
>
> roy
> --
> Roy Sigurd Karlsbakk
> (+47) 97542685
> roy at karlsbakk.net
> http://blogg.karlsbakk.net/
> --
> I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk.
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss


-- 
Vennlige hilsener / Best regards

roy
--
Roy Sigurd Karlsbakk
(+47) 97542685
roy at karlsbakk.net
http://blogg.karlsbakk.net/
--
I all pedagogikk er det essensielt at pensum presenteres intelligibelt. Det er et elementært imperativ for alle pedagoger å unngå eksessiv anvendelse av idiomer med fremmed opprinnelse. I de fleste tilfeller eksisterer adekvate og relevante synonymer på norsk.