Date: Thu, 19 Jul 2012 18:25:56 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "James Snow" <snow@teardrop.org>, <freebsd-stable@freebsd.org> Subject: Re: Checksum errors across ZFS array Message-ID: <A499D60F20E6403981FE97AA9B0FB3E6@multiplay.co.uk> References: <20120719152909.GL32960@teardrop.org>
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----- Original Message -----
From: "James Snow" <snow@teardrop.org>
>I have a ZFS server on which I've seen periodic checksum errors on
> almost every drive. While scrubbing the pool last night, it began to
> report unrecoverable data errors on a single file.
>
> I compared an md5 of the supposedly corrupted file to an md5 of the
> original copy, stored on different media. They were the same, suggesting
> no corruption.
...
Had this before, has always turned out to be failing hardware. Its
been a mixture of faults for us:-
1. Memory, even though ECC and not reporting failures in use or
via memtest.
2. CPU / Northbridge on old AMD's, not 100% sure which. This started
as ZFS checksum issues and then weeks / months later resulting in
random untraceable panic and watchdog timeouts in bge nic.
Disabling the cores on the second CPU fixed this for us on two separate
machines e.g.
/boot/loader.conf
hint.lapic.2.disabled="1"
hint.lapic.3.disabled="1"
So while ZFS can report errors on files, that aren't errors on the
disks themselves and hence the data, as you confirmed, is fine don't
ignore it.
Regards
Steve
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