"ad0: TIMEOUT - WRITE_DMA" type errors with 7.0-RC1

Henri Hennebert hlh at restart.be
Sat Jan 26 02:54:48 PST 2008

Jeremy Chadwick wrote:
> On Fri, Jan 25, 2008 at 06:17:24PM -0700, Joe Peterson wrote:
>> Glad you got it back!  Yes, when I was first playing with ZFS, I noticed
>> that booting between single and multi user mode could make the pools
>> "invisible".  Import seemed to bring them back...
> I did go into single-user mode and attempt to do ZFS-related commands,
> which might explain the "no datasets available" once I was back in
> multiuser!  I would classify that as a bug, and one which is going to
> cause all sorts of hair-pulling for administrators in the future.  I
> wonder what it's caused by.

In single user / is read only and so /boot/zfs/zpool.cache can't be 


> The "import" technique I found on a forum somewhere, or possibly on a
> Solaris mailing list.  I was really sweating there for a moment...
>> So, is the disk toast, or can you still read anything from it (part
>> table, etc.)?
> The ad6 disk (/backups) fsck'd cleanly without any missing files or
> anomalies.
> The ZFS pool that has two striped disks (ad8 and ad10) is fully intact
> too, with no loss of data that I can see.  I'll have to run a scrub
> after I'm done copying data over to ad6, just to make sure though.

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