topic Re: SCSI read error in Operating System - HP-UX

SCSI read error

Radhakrishnan Venkatara — Tue, 18 Mar 2003 06:01:13 GMT

hi ,

I was getting the following error in the server.

SCSI: Read error -- dev: b 31 0x070000, errno: 126, resid: 2048,
blkno: 8, sectno: 16, offset: 8192, bcount: 2048.

SCSI: Read error -- dev: b 31 0x070000, errno: 126, resid: 2048,
blkno: 8, sectno: 16, offset: 8192, bcount: 2048.

SCSI: Read error -- dev: b 31 0x070000, errno: 126, resid: 2048,
blkno: 8, sectno: 16, offset: 8192, bcount: 2048.

SCSI: Read error -- dev: b 31 0x070000, errno: 126, resid: 2048,
blkno: 8, sectno: 16, offset: 8192, bcount: 2048.

SCSI: Read error -- dev: b 31 0x070000, errno: 126, resid: 2048,
blkno: 8, sectno: 16, offset: 8192, bcount: 2048.

The harddisk /dev/dsk/c7t0d0 was not sensing in ioscan.

Later today the output of dmesg is
LVM: Recovered Path (device 0x1f070000) to PV 0 in VG 2.
LVM: Restored PV 0 to VG 2.

and the harddisk is getting sensed in the ioscan and filesystem is up.

what could be possible reason that have happened to make harddisk not available.
Details :-
hard disk was in fc10 disk array N class server

thanks
radhakrishnan

Re: SCSI read error

Balaji N — Tue, 18 Mar 2003 06:05:06 GMT

hi
make sure you have you all the backups ready. time to repalce the hdd i guess.
-balaji

Re: SCSI read error

T G Manikandan — Tue, 18 Mar 2003 06:10:08 GMT

Looks like the disk has some defective blocks.

The option you can try is to re-create the file system on that disk using newfs and check it.
It still it gives errors then you should go in replacing the disk.

//Make sure that you backup//

Re: SCSI read error

Eugeny Brychkov — Tue, 18 Mar 2003 07:06:39 GMT

Agree you have to have a good recent backup. But before disk replacement you can try reseating disk within FC10 slot (offline) and checking disk surface with 'dd if=/dev/rdsk/c7t0d0 of=/dev/null bs=4096k'.
If there're another disks installed within the same FC10 and you get this error only for this one (considering that you use other FC10 disks on this host) then replace disk
Eugeny

Re: SCSI read error

KCS_1 — Tue, 18 Mar 2003 09:48:05 GMT

hello~

I have seem this message before.

Above posted message are good stuff for solving your problem.

In addition,

Check your h/w(disk : /dev/dsk/c0t8d0) :

# ioscan -funCdisk

look at all disk which are returned correct status or not

# diskinfo -v /dev/dsk/c0t8d0

Returned correct informations from the disk or not

# dd if=/dev/dsk/c0t8d0 of=/dev/null bs=512k

testing of read/write

are they say normal status??
if, all of things are good,
in my opinion, that's ok!

but, one of things returned not ok, swap in/out and then gathering the disk information,again such as above,again.

you have a problem,may it's bad disk!! i think
Call your CE of HP.

finally, look at under thread about wwwName Fc disk replace procedure:

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&admit=-682735245+1047980445589+28353475&docId=200000062908600

have a good day!