From: Dan Stromberg <strombrg@dcs.nac.uci.edu>
To: LVM general discussion and development <linux-lvm@redhat.com>,
rascal.jumper-747@redhat.com
Subject: Re: [linux-lvm] Re: If one disk fails i loose everything?
Date: Tue, 13 Dec 2005 11:41:10 -0800 [thread overview]
Message-ID: <1134502870.14744.51.camel@seki.nac.uci.edu> (raw)
In-Reply-To: <439F07E3.80804@cox.net>
It really shouldn't work that way. RAID 5 is based on XOR, and I'm
pretty sure XOR can only recover from a single-number failure.
-But-, if you had a hot spare or warm spare configured, then it would've
been possible for one drive to die, the RAID 5 to be resync'd, another
drive to die, and then still be OK.
On Tue, 2005-12-13 at 12:41 -0500, Old Fart wrote:
> Andrew Burgess wrote:
> >> Good discussion....the need to protect data under various contingencies
> >> is why I use raid5 sets as the PVs. You can lose up to two and keep
> >> your data, hot add, have spares, etc.
> >>
> >
> > You mean raid6
> >
> > _______________________________________________
> > linux-lvm mailing list
> > linux-lvm@redhat.com
> > https://www.redhat.com/mailman/listinfo/linux-lvm
> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> >
> >
> Actually I meant raid 5 based on actual 2 disk dropouts experienced on
> test systems and the LVM data was still available. Probably lucky.
> Thanks for the note.
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm@redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
next prev parent reply other threads:[~2005-12-13 19:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-13 16:24 [linux-lvm] Re: If one disk fails i loose everything? Andrew Burgess
2005-12-13 17:41 ` Old Fart
2005-12-13 19:41 ` Dan Stromberg [this message]
2005-12-18 11:44 ` Christopher Hicks
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