On Feb 9, 2012, at 10:07 AM, Martin Simmons wrote:

>>>>>> On Wed, 8 Feb 2012 20:22:46 -0600, Mark  said:
>> 
>> Just checking to see if people are having success with storage daemon
>> running on FreeBSD 9.0 with ZFS and compression enabled?  I ask because I'm
>> having issues with the backups completing without any errors reported, but
>> then an immediate restore attempt fails due to block checksum mismatches,
>> or trying something like 'bls -j -v -V Full-0079 FileStorage1' will fail
>> and exit with a block checksum mismatch.
>> 
>> The pool is a raidz1 made up of 5 1.5TB drives.  I can run a scrub, get a
>> clean result, run a backup, then have a restore from that backup fail (only
>> for larger backups, small ones seem fine).  A scrub run after that will
>> also report errors, usually 1 or 2 out of roughly 600GB of data, and it
>> will show them as repaired.  I'm just trying to determine if I'm being
>> bitten by the SATA controller, it's an ' <ATI IXP700 AHCI SATA controller>'
>> and I have to set the storage type to IDE instead of AHCI and set
>> 'hint.ahci.0.msi=0' in loader.conf or the system can't even see the drives.
>> Or maybe what I'm trying here is a bad idea?  I'd just like the
>> compression without the overhead and slowdown on the clients that comes
>> from enabling compression in the fileset.  I'm a FreeBSD neophyte, is the
>> SATA/AHCI stuff just not good yet or would much better results be likely
>> with a newer board/controller?
> 
> I think your ZFS setup should work fine, but I don't know about your specific
> hardware.
> 
> You must have hardware problems -- not necessarily in the SATA controller
> though.  The block checksum mismatches suggest that the wrong data was written
> to the disk.
> 
> Have you got EC RAM?  Have you run Memtest86?

I run a FreeBSD 9.0 setup with ZFS (8 drives in raidz2).  Compression and dedup 
on.

It runs like a champ, no problems at all so far.  I'll second the guess that 
you 
have hardware problems.


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