syslog warning message

[Kranti Mahmud]

Hi All,

Our SAP production node syslog having the following warning message:

Oct 14 11:51:15 SAPDBCI cmcld: WARNING: Cluster lock disk /dev/dsk/c21t0d0 has failed: I/O error
Oct 14 11:51:15 SAPDBCI cmcld: Until it is fixed, a single failure could
Oct 14 11:51:15 SAPDBCI cmcld: cause all nodes in the cluster to crash

Info: Server model-rp7420, OS-HPUX 11.11

At present server is running well with all the SAP applications. But, as its our active node of SAP production, I wanna know the root cause of it.

Any suggestion from anyone.

Rgds-Kranti

[Bijeesh]

Hi,
From the log file,
>>disk /dev/dsk/c21t0d0 has failed: I/O error>>

So you can start with checking the status of the mentioned disk, using diskinfo and dd commnds.

[vishnu.khandare]

Hi Kranti,

Please check the I/O hits on that perticular disk by sar and timex by that u may get the root cause of this.

Regards
Vishnu Khandare

[Chandrahasa s]

Hi,
do

#dd if=/dev/dsk/c21t0d0 of=dev/null bs=1024 count=10224

check your getting any error.

do

#diskinfo /dev/rdsk/c21t0d0.

if both above command given failes then you need to take urgent action as this disk is cluster lock.

Replacement of disk can be done online.

Chandra

[singh sanjeev]

This indicate that there might be some problem with your cluster lock device you have to check for the availablity of the cluster disk, otherwise it cause trouble in node polling.
#diskinfo /dev/rdsk/c21t0d
#dd if=/dev/dsk/c21t0d0 of=dev/null bs=1024 count=10224

check your getting any error..
Replacement of disk is advisable.

[Aneesh Mohan]

Hi,

(a) Could be DISK problem
Check using dd
(b) Could the I/O path problem
Check you have any alternative paths to this disk from storage is available.


Aneesh