On 3-Apr-08, at 8:14 PM, Zan Lynx wrote:
On Tue, 2008-04-01 at 15:51 -0400, Jeff Mahoney wrote:
Ric's right about disk drives, though. They'll remap the bad sectors
automatically at the hardware level. When you start to see bad
sectors
at the file system level, it means that the sectors reserved for
remapping have been exhausted and you should replace the disk.
There are a couple of cases where you can see bad block errors on a
good
drive.
If a block is written with a bad CRC for some reason...the write head
got a freak blip or it lost power as it was writing, or the data went
corrupt while sitting on disk, then it will read as a bad block, but
rewriting would fix it.
A RAID media verify or a badblocks -n run can usually fix these.
Only if your RAID uses CRCs (most don't).
ZFS is the real answer to undetected corruption.
--Toby
--
Zan Lynx <zlynx@xxxxxxx>
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