Today, I had a sudden corruption on the system disk/partition, or rather
the zfs partition where the image file of a VirtualBox VM is located
(i.e. not the rpool):
----------------------------------------
pool: systempool
state: ONLINE
status: One or more devices has experienced an error resulting in data
corruption. Applications may be affected.
action: Restore the file in question if possible. Otherwise restore the
entire pool from backup.
scan: scrub repaired 0 in 0h16m with 1 errors on Sun Feb 19 10:45:28 2012
NAME STATE READ WRITE CKSUM
systempool ONLINE 0 0 2
c2d0p4 ONLINE 0 0 4
errors: Permanent errors have been detected in the following files:
/systempool/images/Windows 7 x64 Ultimate.vdi
----------------------------------------
I don't understand what the "2" and "4" cksum errors mean, why the
numbers are different and why they only lead to "1" error but I
understand that the .vdi file is now corrupt. What is conspicuous is
that there are _no_ errors in iostat:
----------------------------------------
c2d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
Illegal Request: 0
----------------------------------------
So am I to understand that the cause of this is entirely software
related? If there was an error in the hard drive then iostat should have
returned some errors as well. This is not the first time this happens to
me and last time it happened was on another hard drive.
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