DESC:The backup is failling due to I/O error for the node XYZ

01/02/2013 13:53:49 ANS4023E Error processing '/': file input/output error
01/02/2013 14:31:47 ANS1999E Incremental processing of '/' stopped.

01/02/2013 14:31:47 ANS4023E Error processing '/': file input/output error
01/02/13 14:32:46 ANS1999E Incremental processing of '/opt/CA' stopped.

01/02/13 14:32:46 ANS1999E Incremental processing of '/' stopped.

01/02/13 14:32:46 ANS4023E Error processing '/': file input/output error
01/02/13 14:32:46 ANS1512E Scheduled event '@2846' failed. Return code = 12.

Can someone help me with this...

Yes...IBM and/or Tivoli support can help you. Those are Tivoli Storage Manager messages.

You didn't tell us any details we'd need to help you, such as what OS the node is running, or even what backup software you were using. If someone didn't know TSM already, they wouldn't know what you were using.

The messages are clear...it can't read from the file systems specified. So, either that node is having a problem, it shut down during backup, or the TSM agent is not running as root, which will not give it permissions to do what it needs to do.

Tivoli Storage Manager is running on this Node (TSM)

Red Hat Enterprise Linux Server release 5.5 (Tikanga)

Will unmounting it and running fsck will resolve this issue, it think that message says that filesystem is readonly and nothing can be done

Ok...again, Tivoli support would be the people to ask. You are in a paid-for-, totally supported environment...you are paying for support from both Red Hat and IBM.

If you're having disk problems on that server, then you will (very obviously), get IO errors on the disk. So yes, rebooting the server from CD/DVD, and running fsck on the corrupted partitions would be a good idea...unless your file systems are mounted read/write, then TSM won't work. If you have problems with that server, you should call Red Hat support...TSM is NOT a cheap piece of software, and I doubt you'd be running it on unsupported servers.