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Re: xfs data loss

To: "Passerone, Daniele" <Daniele.Passerone@xxxxxxx>
Subject: Re: xfs data loss
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Sat, 29 Aug 2009 18:24:47 -0700
Cc: "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>
In-reply-to: <B9A7B002C7FAFC469D4229539E909760308DA65408@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <B9A7B002C7FAFC469D4229539E909760308DA651DE@xxxxxxxxxxxxxxxxxxxxxxxxxxx> <4A975A35.3060809@xxxxxxxxxxx> <B9A7B002C7FAFC469D4229539E909760308DA65345@xxxxxxxxxxxxxxxxxxxxxxxxxxx> <4A981133.6060009@xxxxxxxxxxx> <B9A7B002C7FAFC469D4229539E909760308DA65408@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
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Passerone, Daniele wrote:
I would like to ask mr. Peter Grandi, whether it is really necessary
to delivery ist vaste knowledge in such a harsh way. Is this the
habit of this mailing list?

Not generally.

Apart from that, thank you for you help. I understand that RAID5 is
not the ideal solution for that system, and I admit that in the
urgence of solving the /md4 problem I miswrote the problem of /md6,
which of course was "erased" and not "repaired".

But apart from that, it is not as easy to backup 20 TB, so we decided
to set it as data storage leaving the responsibilty of the backup to
our users. I do not consider it completely absurd.

I think others have pointed out, though, that you start -increasing- the risk of failure at a certain point...

Moreover, when a raid loses 2 devices, and the devices are still ok,
it is possible to reassemble the raid by assuming the devices clean.

This is not the case for /Raid/md4, where apparently all devices are

This all seems most likely to be a raid failure problem, but it's hard to know. I can't imagine why you're getting suddenly-disappearing directories without a reboot or even a single error message; I just don't know what to make of that.


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