Hello,

Mikael Pettersson wrote:

On Sat, 16 Jun 2007 15:52:33 +0400, Brad Campbell wrote:

quoted

I've got a box here based on current Debian Stable.
It's got 15 Maxtor SATA drives in it on 4 Promise TX4 controllers.

Using kernel 2.6.21.x it shuts down, but of course with a huge "clack" as 15 drives all do emergency 
head parks simultaneously. I thought I'd upgrade to 2.6.22-rc to get around this but the machine 
just hangs up hard apparently trying to sync cache on a drive.

I've run this process manually, so I know it is being performed properly.

Prior to shutdown, all nfsd processes are stopped, filesystems unmounted and md arrays stopped.
/proc/mdstat shows
root@storage1:~# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
unused devices: <none>
root@storage1:~#

Here is the final hangup.

http://www.fnarfbargle.com/CIMG1029.JPG

Something sent a command to the disk on ata15 after the PHY had been
offlined and the interface had been put in SLUMBER state (SStatus 614).
Consequently the command timed out. Libata tried a soft reset, and then
a hard reset, after which the machine hung.

Hmm... weird.  Maybe device initiated power saving (DIPS) is active?

I don't think sata_promise is the guilty party here. Looks like some
layer above sata_promise got confused about the state of the interface.

But locking up hard after hardreset is a problem of sata_promise, no?

Thanks.

-- 
tejun