From owner-freebsd-geom@FreeBSD.ORG  Thu May 18 07:19:59 2006
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Date: Thu, 18 May 2006 00:19:57 -0700
From: "D X" <dragonx@gmail.com>
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Subject: GEOM, gvinum, and SATA disks in standby
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After idling my gvinum RAID1 array using ataidle on a pair of WD Caviar
250GB SATA disks, I almost always get a READ_DMA timeout when trying to
access the disk (I'm guessing they take too long to spin up).

At this point one of 3 things will happen (which one it is seems random to
me at this point)

1. Both disks retry fine, and everything's great.  Unfortunately, this
happens about 1/3 of the time the disks come out of standby.
2. One of the disks retries fine, but the 2nd disk times out and gets
detached.  And I have a degraded array.  If I try to restart the downed ple=
x
in gvinum, I get a kernel panic.
3. Both of the disks fail, my OS is partly hung, although I still get
responses to ping packets.  My console and terminals are dead though, as is
my httpd.  I usually end up rebooting in this case.

I saw a couple of posts online from last year mentioning similar issues.  I=
s
this a known bug that's going to be fixed anytime soon?