Date: Sun, 29 Jun 2008 23:43:44 +0930 From: Benjamin Close <Benjamin.Close@clearchain.com> To: Rainer Duffner <rainer@ultra-secure.de> Cc: Garrett Cooper <yanefbsd@gmail.com>, current@freebsd.org, sos@freebsd.org Subject: Re: URGENT: Need help rebuilding iir RAID5 array with failed drive Message-ID: <48679898.3000905@clearchain.com> In-Reply-To: <F8F21D91-0BF9-4525-A397-D2632821C7E5@ultra-secure.de> References: <7d6fde3d0806260649t6619521bv92b65c472ddb7e1@mail.gmail.com> <6.0.0.22.2.20080627170323.02591528@mail.computinginnovations.com> <7d6fde3d0806272057p795277a2ie60ac7d7d10f0a6e@mail.gmail.com> <7d6fde3d0806280129i31874960ofbc7627598e1426f@mail.gmail.com> <735A937C-89A9-411A-AA3F-377F576E635E@freebsd.org> <7d6fde3d0806280348r65875755pf7dc3917bba2bcb5@mail.gmail.com> <7d6fde3d0806280349j7eace513idb5cd81f9e2e4e0a@mail.gmail.com> <6.0.0.22.2.20080628132240.0255ba38@mail.computinginnovations.com> <7d6fde3d0806281410r781a6a77k98ffe237c10e3eee@mail.gmail.com> <D0A03968-B9F2-4EF8-B754-D0EFA90A9C1E@FreeBSD.ORG> <7d6fde3d0806282011x472f8d27s955a8e1ab43a7341@mail.gmail.com> <F8F21D91-0BF9-4525-A397-D2632821C7E5@ultra-secure.de>
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Rainer Duffner wrote:
>
> Am 29.06.2008 um 05:11 schrieb Garrett Cooper:
>
>>
>> Just as you predicted, the disk(s) are unreadable still, even after
>> the rebuild (and I hope to hell that it didn't destroy/disturb any
>> data on the surviving members).
>>
>> I may just have to get it sent off for recovery (after I dd the
>> remaining members because there's still some usable data there --
>> bloody 2.7TB ... grr) -- apart from that I don't think I have a
>> choice.
>
>
> <tongue in cheek>
> If the data was worth so much that it values recovery....
> </tongue in cheek>
>
>>
>> Oh, where's this "document" of which you speak all the time? I don't
>> see anything about parity support not being available in either the
>> geom or iir manpage, or the iir sourcecode. If someone needs a helping
>> hand inserting that logic into the kernel, I'll gladly assist so
>> others don't follow my footsteps and fsck up their data.
>>
>
>
> On our HP DL320G5s, FreeBSD7 didn't even detect the MatrixRAID array
> (RAID1).
> Even the Windoze-guys tell us that they don't trust it.
>
> So we settled for RAID1 via gmirror.
>
> MatrixRAID is a scam, if you ask me - like all the other BIOS-RAIDs we
> have had the displeasure to see over the years.
> I really thought it was common knowledge. But now that you mention
> it, I can't find a reference to this in the FreeBSD docs (at least not
> with a quick look).
> The handbook-example uses RAID1, though.
Perhaps a lesson as developers we should take from this, is to put a
warning in ata about raid5. It's fooled Garret into believing he had a
raid5, how many others are also using ata believing their raid5 is a
raid5. We should warn people in the future rather than just saying 'its
in the docs'. A kernel warning at attach is much more visible.
Cheers,
Benjamin
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