You're using an *old* version of both OpenSolaris and zpool. There have been a
few corruption bugs fixed since then. I'd recommend updating.
- Garrett
On Oct 22, 2011, at 9:27 AM, Robert Watzlavick wrote:
> I've noticed something strange over the past few months with four files on my
> raidz. Here's the setup:
> OpenSolaris snv_111b
> ZFS Pool version 14
> AMD-based server with ECC RAM.
> 5 ST3500630AS 500 GB SATA drives (4 active plus spare) in raidz1
>
> The other day, I observed what appears to be undetected file corruption in 4
> of the files on the raidz. I have two external USB hard drives that I use to
> back up the contents of the ZFS raidz on alternating months. The USB hard
> drives use EXT3 so they are connected to a Linux box which in turn connects
> to the raidz over NFS. Occasionally, I use the checksum option on rsync
> (rsync -ainc) to make sure everything on the USB hard drives match before I
> perform the real rsync back from the raid to the USB disk and that's when I
> noticed the changes. In each file, there was a single byte changed. Running
> zpool status doesn't show any errors and running zpool scrub doesn't show any
> problems either.
>
> One of the changed files was a .ppt file that I downloaded from the web over
> a year ago and the other 3 were Acronis incremental Backup files from my XP
> machine that get stored on the raidz. Since ZFS files aren't supposed to be
> corrupted without notification (right?), I initially assumed the problem was
> with the USB drive. For the 3 Acronis backup files, I had no way of knowing
> which version was the correct one because Acronis shows all of them to be
> valid. The .ppt file was not on the web anymore but with the help of the
> Wayback machine, I was able to re-download it and that's when I confirmed the
> "good" copy from the web matches the copy on my USB hard drive, not the copy
> on the raidz. I know I haven't modified the .ppt file because the date still
> matches the date I downloaded it, 2010-01-12.
>
> What failure scenario could have caused this? The file was obviously
> initially good on the raidz because it got backed up to the USB drive and
> that matches the "good" version from the web.
>
> Thanks in advance,
> -Bob
>
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> zfs-discuss@opensolaris.org
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