On 09/07/10 03:04 PM, Greg Freemyer wrote: ..
When I re-ran it, /var/log/messages reported 10 bad logical blocks. And even worse, dd reported 20 bad blocks. I examined the data dd read and it had 80KB of zero'ed out data. So that's 160 sectors worth of data lost because of a single bad sector. At most I was expecting 4KB of zero'ed out data.
.. That's just the standard, undesirable result of the current SCSI EH when used with libata for (mainly) desktop computers. I have patches (against older kernels) to fix it, but have yet to get both myself and James B. interested enough simultaneously to actually get the kernel fixed. :) ..
cmp -bl clean.dd corrupt.dd> delta.log Looking at delta.log, the bytes start disagreeing 4 bytes prior to the sector boundary. How can that be?
.. Dunno. That could be a different problem. I've seen the odd scattered report of data corruption on ext3/ext4 with large data sets, but don't know what the root causes were. Cheers -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
