topic SCSI :Read error in Operating System - HP-UX

SCSI :Read error

j773303 — Wed, 10 Sep 2003 05:50:10 GMT

What's happend about below message, I found many such as message in the syslog.log.

vmunix: SCSI: Read error -- dev: b 31 0x07b000, errno: 126, resid: 2048,
Sep 8 07:04:32 deidv02 vmunix: blkno: 8, sectno: 16, offset: 8192, bcount: 2048.

Re: SCSI :Read error

Tom Geudens — Wed, 10 Sep 2003 07:40:04 GMT

Hi,
There's probably an problem with the disk /dev/dsk/c7t11d0.
Is this disk mirrored ?

Regards,
Tom Geudens

Re: SCSI :Read error

j773303 — Wed, 10 Sep 2003 07:53:02 GMT

How do you know the /dev/dsk/c7t11d0 got the problem?
Yes, the disk has an mirror disk.

Re: SCSI :Read error

T G Manikandan — Wed, 10 Sep 2003 08:04:27 GMT

dev: b 31 0x07b000

major device number 31 refers to the disk

you can do a
#lsdev|grep 31

Take off 0x0 from 0x07b00

7b0 this refers to c7t11d0

Thanks

Re: SCSI :Read error

Saurav_1 — Wed, 10 Sep 2003 08:15:33 GMT

Hi,

To test the bad block errors of this disk. Try this command.
# dd if=/dev/rdsk/c7t11d0 of=/dev/null bs=2048

The output of this command will show you total blocks in and out. The values should be equal and no errors should be generated. you can do this online. and it will not harm the system. It will dummy procesure to check the surface of the disk.

Saurav

Re: SCSI :Read error

Denis C-Combe — Tue, 28 Oct 2003 04:10:28 GMT

errno: 126, generic "power failed" message that means that the disk stopped responding to SCSI commands
PS: this comes from an HP-UX expert but I don't know where he got this information from... if someone knows, thanks to tell me.

I got the same message on an internal mirrored disk c2t2d0. Before concluding the disk is nearly dead, I'm going to apply SCSI and LVM patches to see if it doesn't solve the Pb.

How did you solve your Pb ? Have you replaced the disk ?

Rgds,
Sabrina