vmunix: SCSI: Async write error -- dev: b 3 0x0c0100, errno: 5, resid: 4096

[Lee Abell]

I am seeing this error periodically in my syslog.log file. I have not noticed any problems, though. My question is how to identify what device this message is referring to? I have 2 internal disks and a fiber connection to an HP EVA SAN.

[Tim Nelson]

first guess.

/dev/dsk/c12t1d0

review the device with xstm for errors.

could also run a dd from it, i would guess reads would also fail.

dd if=/dev/rdsk/c12t1d0 of=/dev/null bs=1024

should get an io error.

either way it probably needs to be replaced.

if it is san storage then more investigation needs to be done as there should be errors on the array or something else going on.

[TTr]

That would be disk c12t0d1.

If you do "ll /dev/dsk" you 'll see that the c12t0d1 has a minor number 0x0c0100.

c12 = 0x0c
t0d1 = 0x0c01

[Steven E. Protter]

Shalom,

If this message is accompanied by an lbolt there is a disk problem.

If this issue is with a local disk, a desk may be failing.

I'd say this message refers to a local disk. To be sure, I'd need to match the device up to an ioscan -fnC disk

command output to identify the problem disk.

SEP

[Tim Nelson]

sorry for my error.

TTr is correct.

My reference would have had a minor number of
/dev/dsk/c12t1d0= 0x0c1000

[Asif Sharif]

Hi Lee,
It sounds like a hardware problem(Disk failed).
Did you try "ioscan -fnC disk" command to see if something is in an NO_HW state ?

Regards,
Asif Sharif

[TTr]

The Async write error is a soft error, it would not show up as a NO_HW device. The disk is probably in the EVA because FC volumes usually have a large number in their controller (c12). Run some read tests as Tim suggested. Is this disk unusually busy? These errors could be caused by SCSI timeouts as well.

[Torsten.]

The "d1" value is a LUN (probably LUN1) - so it is likely in the SAN.

If I assume the vdisk is not in RAID0 it is unlikely a disk error - but maybe a connection error.

I would check the connection from the SAN switch first (error counters etc.).

[Torsten.]

See also a similar thread

http://forums12.itrc.hp.com/service/forums/questionanswer.do?threadId=480130