Commands to check for read only Linux file system

10 April,2013 by Jack Vamvas

Checking for read only on the Linux file system is required when investigating certain DB2  problems especially disk errors

For example, I  saw an error :

--from db2diag.log 
SQL1042C An unexpected system error occurred. SQLSTATE=58004 . 
--from linux logs
Dec 19 08:02:05 server1 kernel: Buffer I/O error on device dm-18, logical block 1562696
Dec 19 08:02:05 server1 kernel: lost page write due to I/O error on dm-18
Dec 19 08:02:05 server1 kernel: SCSI error : <0 0 2 0> return code = 0x20000
Dec 19 08:02:05 server1 kernel: end_request: I/O error, dev sdc, sector 12503752

 

Some root cause analysis highlighted a disk error causing a Linux mountpoint to become a read only.

Commands to check for read only Linux  file system

 

grep ‘ro’ /proc/mounts

--miss remote mounts
grep ' ro ' /proc/mounts | grep -v ':'

 Read More

Linux multipath command

DB2 and Linux IO testing tools

Display Linux CPU information

 

Author: Jack Vamvas(http://www.dba-db2.com)

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