Date: Fri, 13 Jan 2006 12:59:37 -0500 From: Mike Tancsa <mike@sentex.net> To: Doug Ambrisko <ambrisko@ambrisko.com> Cc: freebsd-stable@freebsd.org Subject: Re: 6.0 on Dell 1850 with PERC4e/DC RAID? Message-ID: <6.2.3.4.0.20060113125258.045378d8@64.7.153.2> In-Reply-To: <200601131659.k0DGxmob083744@ambrisko.com> References: <200601122020.59843.jkim@FreeBSD.org> <200601131659.k0DGxmob083744@ambrisko.com>
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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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