I've been trying to debug a problem with USB attached mass-storage 
devices on my friends server.  We originally saw the problem on snv_66 
but still see it on snv_74.

While we saw the problem with a zpool on a USB device (a Maxtor one 
touch) we can reproduce it just using mkfs to create a UFS filesystem as 
well.  We have tried different USB ports on the machine,  and different 
drives (WD drive in a cheap Safecom enclosure).

We get the following messages (regardless of drive/usb enclosure type):

Oct 21 18:45:35 server scsi: [ID 107833 kern.warning] WARNING: 
/[EMAIL PROTECTED],0/pci1849,[EMAIL PROTECTED],1/[EMAIL PROTECTED]/[EMAIL 
PROTECTED],0 (sd10):
Oct 21 18:45:35 server  SCSI transport failed: reason 'tran_err': 
retrying command
Oct 21 18:45:41 server scsi: [ID 107833 kern.warning] WARNING: 
/[EMAIL PROTECTED],0/pci1849,[EMAIL PROTECTED],1/[EMAIL PROTECTED]/[EMAIL 
PROTECTED],0 (sd10):
Oct 21 18:45:41 server  SCSI transport failed: reason 'timeout': 
retrying command
Oct 21 18:46:42 server scsi: [ID 107833 kern.warning] WARNING: 
/[EMAIL PROTECTED],0/pci1849,[EMAIL PROTECTED],1/[EMAIL PROTECTED]/[EMAIL 
PROTECTED],0 (sd10):
Oct 21 18:46:42 server  SCSI transport failed: reason 'timeout': giving up
Oct 21 18:46:54 server scsi: [ID 107833 kern.warning] WARNING: 
/[EMAIL PROTECTED],0/pci1849,[EMAIL PROTECTED],1/[EMAIL PROTECTED]/[EMAIL 
PROTECTED],0 (sd10):
Oct 21 18:46:54 server  SCSI transport failed: reason 'timeout': giving up
Oct 21 18:47:00 server scsi: [ID 107833 kern.warning] WARNING: 
/[EMAIL PROTECTED],0/pci1849,[EMAIL PROTECTED],1/[EMAIL PROTECTED]/[EMAIL 
PROTECTED],0 (sd10):
Oct 21 18:47:00 server  SCSI transport failed: reason 'timeout': giving up
Oct 21 18:47:06 server scsi: [ID 107833 kern.warning] WARNING: 
/[EMAIL PROTECTED],0/pci1849,[EMAIL PROTECTED],1/[EMAIL PROTECTED]/[EMAIL 
PROTECTED],0 (sd10):
Oct 21 18:47:06 server  SCSI transport failed: reason 'timeout': giving up

prtconf, smbios, prtdiag, scanpci output can be found at: 
http://nessieroo.com/usb-timeout

We have tried setting the reduced command set in scsa2usb.conf but that 
didn't change the behaviour on snv_66 or snv_74.

What should we be trying next for debugging this ?  Any known issues ?  
While it would be nice to get the Maxtor onetouch to work if a different 
drive is needed that is fine but the goal is a zpool on a single USB 
device (this is a remote backup written to by rsync and we want ZFS 
features).

--
Darren J Moffat


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