At 11:59 AM 13/01/2006, Doug Ambrisko wrote:
|
| That's lame. Under what condition does it happen, do you know?
Running RAID 10, a drive was swapped and the rebuild started on the
replacement drive. The rebuild complained about the source drive
for the mirror rebuild having read errors that couldn't be recovered.
It continued on and finished re-creating the mirror. Then the RAID
proceeeded onto a background init which they normal did and started
failing that and re-starting the background init over and over again.
The box changed the RAID from degraded to optimal when the rebuild
completed (with errors). Do a dd of the entire RAID logical device
returned an error at the bad sector since it couldn't recover that.
The RAID controller reported an I/O error and still left the RAID as
optimal.
We reported this and where told that's the way it is designed :-(
Interesting timing as I ran into this sort of situation on the
weekend on a 3ware drive in RAID1. The card had complained for a week
about read errors on drive 1. We thought we would wait until the
weekend maintenance window to swap it out. Sadly, before that
window, drive zero totally died a horrible death. We popped in a new
drive on port zero, started the rebuild, and it crapped out saying
there was a read error on drive 1. However, there is a check box
that says continue the build, even with errors on the source drive.
This setup seems to give you the best of both worlds. We did a quick
check of the resultant files compared to backups and only a couple
were toasted. (The box is going to be retired in a month, so if there
is other hidden fs corruption if it holds out for another 3 weeks we
dont care too much). The correct approach would be to do a total
restore of course, but this was good enough for us in this
situation. I guess the question is, is this RAID1 in a proper mirror
given that there are hard errors on the drive on port 1 ?
---Mike
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