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ioscan hangs - All disk check out OK.

Eric Hagen
Occasional Advisor

ioscan hangs - All disk check out OK.

Reading up on a hung ioscan here seems to point to a disk or SCSI bus problem.
I get no error messages from the syslog, dmesg shows no errors, and all the disk pass stm, diskinfo, and even dd, even the tape drive works and I get no write or read errors.

The only thing that has increased was the seek errors went from 12 to 13, which is a very low number.

With this problem I can not do an ignite backup, and rebuilding this production would be very time consuming and make the wrong people unhappy.

Any other suggestions in troubleshooting to identify the cause?

Basic L2000 system, 4 disk, CDROM, Tape drive.

ioscan -kfn -C disk
Class I H/W Path Driver S/W State H/W Type Description
=====================================================================
disk 0 0/0/1/1.0.0 sdisk CLAIMED DEVICE HP 36.4GMAN3367MC
/dev/dsk/c1t0d0 /dev/rdsk/c1t0d0
disk 4 0/0/1/1.2.0 sdisk CLAIMED DEVICE SEAGATE ST336704LC
/dev/dsk/c1t2d0 /dev/rdsk/c1t2d0
disk 1 0/0/2/0.0.0 sdisk CLAIMED DEVICE HP 36.4GATLAS10K3_36_SCA
/dev/dsk/c2t0d0 /dev/rdsk/c2t0d0
disk 2 0/0/2/0.2.0 sdisk CLAIMED DEVICE SEAGATE ST336704LC
/dev/dsk/c2t2d0 /dev/rdsk/c2t2d0


ioscan without -k still hangs.

< Write Errors: 0 Non-Medium Errors: 12
---
> Write Errors: 0 Non-Medium Errors: 13

-- Information Tool Log for SCSI Disk on path 0/0/1/1.0.0 --
Log creation time: Sun Aug 29 22:55:24 2010
Hardware path: 0/0/1/1.0.0
Product Id: MAN3367MC Vendor: HP 36.4G
Device Type: SCSI Disk Firmware Rev: HP05
Device Qualifier: HP36.4GMAN3367MC Logical Unit: 0
Serial Number: KN029701
Capacity (M Byte): 34732.89
Block Size: 512
Max Block Address: 71132959
Smart Enabled: TRUE
Error Logs
Read Errors: 0 Buffer Overruns: N/A
Read Reverse Errors: N/A Buffer Underruns: N/A
Write Errors: 0 Non-Medium Errors: 13
Verify Errors: 0



# diskinfo /dev/rdsk/c1t0d0
SCSI describe of /dev/rdsk/c1t0d0:
vendor: HP 36.4G
product id: MAN3367MC
type: direct access
size: 35566480 Kbytes
bytes per sector: 512
Mon Aug 30 00:49:00 GMT 2010
dd if=/dev/rdsk/c1t0d0 of=/dev/null bs=512
71132960+0 records in
71132960+0 records out
Mon Aug 30 04:16:21 GMT 2010



# diskinfo /dev/rdsk/c1t2d0
SCSI describe of /dev/rdsk/c1t2d0:
vendor: SEAGATE
product id: ST336704LC
type: direct access
size: 35566480 Kbytes
bytes per sector: 512
date;dd if=/dev/rdsk/c1t2d0 of=/dev/null bs=512 ;date
Mon Aug 30 03:21:17 GMT 2010
71132960+0 records in
71132960+0 records out
Mon Aug 30 05:48:31 GMT 2010

# diskinfo /dev/rdsk/c2t0d0
SCSI describe of /dev/rdsk/c2t0d0:
vendor: HP 36.4G
product id: ATLAS10K3_36_SCA
type: direct access
size: 35566480 Kbytes
bytes per sector: 512
date;dd if=/dev/rdsk/c2t0d0 of=/dev/null bs=512 ;date
Mon Aug 30 03:22:26 GMT 2010
71132960+0 records in
71132960+0 records out
Mon Aug 30 06:00:27 GMT 2010



# diskinfo /dev/rdsk/c2t2d0
SCSI describe of /dev/rdsk/c2t2d0:
vendor: SEAGATE
product id: ST336704LC
type: direct access
size: 35566480 Kbytes
bytes per sector: 512
date;dd if=/dev/rdsk/c2t2d0 of=/dev/null bs=512 ;date
Mon Aug 30 04:18:45 GMT 2010
71132960+0 records in
71132960+0 records out
Mon Aug 30 07:23:19 GMT 2010

# ioscan -funC ext_bus
Class I H/W Path Driver S/W State H/W Type Description
=================================================================
ext_bus 0 0/0/1/0 c8xx CLAIMED INTERFACE SCSI C896 Fast Wide Single-Ended
ext_bus 1 0/0/1/1 c8xx CLAIMED INTERFACE SCSI C896 Ultra Wide Single-Ended
ext_bus 2 0/0/2/0 c8xx CLAIMED INTERFACE SCSI C87x Ultra Wide Single-Ended
ext_bus 3 0/0/2/1 c8xx CLAIMED INTERFACE SCSI C87x Ultra Wide Single-Ended


Path Product Active Tool Status
==================== ========================= =========== =============
system system () Information Successful
0 Bus Adapter (582) Information Successful
0/0 PCI Bus Adapter (782) Information Successful
0/0/0/0 Core PCI 100BT Interface Information Successful
0/0/1/0 PCI SCSI Interface (10000 Information Successful
0/0/1/1 PCI SCSI Interface (10000 Information Successful
0/0/1/1.0.0 SCSI Disk (HP36.4GMAN3367 Information Successful
0/0/1/1.2.0 SCSI Disk (SEAGATEST33670 Information Successful
0/0/2/0 PCI SCSI Interface (10000 Information Successful
0/0/2/0.0.0 SCSI Disk (HP36.4GATLAS10 Information Successful
0/0/2/0.2.0 SCSI Disk (SEAGATEST33670 Information Successful
0/0/2/1 PCI SCSI Interface (10000 Information Successful
0/0/2/1.0.0 SCSI Tape (HPC1537A)
0/0/4/0 RS-232 Interface (103c104 Information Successful
0/0/5/0 RS-232 Interface (103c104 Information Successful
0/1 PCI Bus Adapter (782) Information Successful
0/2 PCI Bus Adapter (782) Information Successful
0/3 PCI Bus Adapter (782) Information Successful
0/4 PCI Bus Adapter (782) Information Successful
0/5 PCI Bus Adapter (782) Information Successful
0/6 PCI Bus Adapter (782) Information Successful
0/7 PCI Bus Adapter (782) Information Successful
8 MEMORY (95) Information Successful
160 CPU (5c5) Information Successful
166 CPU (5c5) Information Successful


1 REPLY
Hakki Aydin Ucar
Honored Contributor

Re: ioscan hangs - All disk check out OK.

try this ;

echo 2400?20X | adb /dev/dsk/c2t2d0

you have to see some non zero blocks, like this:
2400: 44454645 43543031 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0

if you see mıre than non-zero blocks mean that disk has Bad Blocks ,and probably needs changing.