Corrupt GPT header on disk from twa array - fixable?
Dmitry Morozovsky
marck at rinet.ru
Sun Jun 2 21:46:57 UTC 2013
On Sun, 2 Jun 2013, Warren Block wrote:
> > > gmirror is good. GPT is also good. The combination is a problem. gmirror
> > > metadata overwrites the backup GPT, so those disks will show "corrupt"
> > > also.
> > > For now, the recommended workaround is to just use MBR, which doesn't have
> > > any
> > > metadata at the end of the disk.
> >
> > ... or gmirror not whole disks, but GPT partitions (as OP does, as far as I
> > can
> > tell from gmirror dmesg reports)
>
> That works, but if there is more than one partition per disk, rebuilds fight
> with each other for the heads.
Right; OTOH, there is usually no more than one or two partitions which are
under write pressure, so *usually* you'll find rebuilding, say, /dev/mirror/var
and /dev/mirror/db (at least most of our gmirror-setup servers show that)
On the third hand, if you have enough memory, ZFS is both simplier and more
lazy regarding repairs ;)
--
Sincerely,
D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer: marck at FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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