Analysis of disk file block with ZFS checksum error

[Joe Peterson]

Julian Elischer wrote:
> it could be an old file..
> what kind of disks?

It's a Seagate ST3500630A parallel ATA drive.

> I had a scenario where 3ware controllers were just failing to write to
> a drive in the array, so old data showed through.

I have an Intel ICH4 controller - nothing unusual.

> the filesystem and the partitions and the raids all were on different
> alignments so teh only part of the system that had a boundary that 
> aligned with the bad data was the physical stripes laid down by the 
> controller.  It was 64k stripes and 64k data missing, exactly on
> stripe boundaries. Due to the fact that FreeBSD had partitioned the 
> drive staring at 63 blocks in, nothing else aligned with the problem.

Hmm, well this is a straight-forward disk situation - never used RAID on
this drive.  Give what is happening, I wonder the changes of it being
HW, OS, or a filesystem issue.

					-Joe