dmesg errors and disks

[Mike_21]

9000/750
HP-UX 10.20

I was doing a bdf, very, very slow, I actually killed the process as it took too long...... So I did a quick dmesg and got the below mesage. I am not sure of the disk setup, if it's mirrored, etc, just took over the system. It seems like the disks are not set using lvm....... Any things I can start to check to investigate a possible bad disk?

Thanks


DIAGNOSTIC SYSTEM WARNING:
The diagnostic logging facility has started receiving excessive
errors from the I/O subsystem. I/O error entries will be lost
until the cause of the excessive I/O logging is corrected.
If the DEMLOG daemon is not active, use the DIAGSYSTEM command
in SYSDIAG to start it.
If the DEMLOG daemon is active, use the LOGTOOL utility in SYSDIAG
to determine which I/O subsystem is logging excessive errors.

SCSI: Async write error -- dev: b 31 0x022000, errno: 16, resid: 8192,
blkno: 32, sectno: 64, offset: 32768, bcount: 8192.

SCSI: Async write error -- dev: b 31 0x022000, errno: 16, resid: 8192,
blkno: 32, sectno: 64, offset: 32768, bcount: 8192.
4/0/3.2 tgt
4/0/3.2.0 sdis

[Ian Dennison_1]

Mike,

Check /var/adm/syslog/syslog.log, see if any specific errors are appearing there as well as 'dmesg'.

if so, look for possible 'lbolt' errors, which can be resolved to a Disk Device Name /dev/dsk/c1t2d3. Resolve this device to a SCSI address using 'ioscan -fn'.

Multiple failures can indicate a bad SCSI Card (as I just found out today).

Share and Enjoy! Ian Dennison

[Helen French]

Hi,

There are some hardware errors. Use STM for checking all your hardwares.

See this for help:

http://www.docs.hp.com/hpux/onlinedocs/diag/stm/stm_qik.pdf

HTH,
Shiju

[Sanjay_6]

Hi Mike,

Check your disk at /dev/dsk/c2t2d0. Seems like this might be giving problem.

hope this helps.

Regds

[Craig Rants]

Sanjay,
Usually /dev/dsk/c2t2d0 is the cdrom, do you think that could cause a slow bdf? Possibly if it was mounted at the time...


C

[Paula J Frazer-Campbell]

HI Mike
Sanjay has it -- you have a disk with problems.

Paula

[Sanjay_6]

Hi Craig,

I just decoded the device that is giving problem,

SCSI: Async write error -- dev: b 31 0x022000, errno: 16, resid: 8192,

0x -> Major No.
02 -> Controller / bus
2 --> Target device
0 --> Lun No.
00 -> Flags


Hope this helps.

Regds

[Craig Rants]

Sanjay,
I know how you decoded it, I am just bring up the issue of a possible cdrom and will it cause the same problems as a hard disk. Seeing as most disks are on different controllers and buses than a cdrom, what would the implications be?

C

[Sanjay_6]

hi Craig,

I cannot say anything about cdrom being at that address. I have a system where my cdrom is at c7t2d0. We can say anything about cdrom being at that place with certainity only after looking at the ioscan output.

Regards
Sanjay

[Sanjay_6]

Hi Craig,

I'm sorry i didn't answer your question fully. I don't see any reason why a cdrom mounted should interfere with the bdf command. I have not seen something like that.

Regds
Sanjay