topic Re: File systems become RD only. in Operating System - Linux

File systems become RD only.

skt_skt — Wed, 10 Jun 2009 17:05:09 GMT

RHEL AS 3 RHEL 5.1
ISCSI/Netapp based Ext3 file system.

We often see that file systems become Read Only mounted after losing connection to the files. Only unmount/mount fixes it.

Is there a way we can avoid unmount/mount to recover the situation? Or this is how it is handled by Linux kernels.?

Re: File systems become RD only.

Michal Kapalka (mikap) — Wed, 10 Jun 2009 18:30:53 GMT

hi,

did you try the "remount" option on mount command ???

Attempt to remount an already-mounted file system. This is commonly used to change the mount flags for a file system,especially to make a readonly file system write-able. It does not change device or mount point.

mikap

Re: File systems become RD only.

Ivan Ferreira — Wed, 10 Jun 2009 18:38:50 GMT

>> after losing connection

Â¿Do you have a real connection problem?

You can use the tune2fs to modify the "error-behaviour" with the -e option. Check the man pages.

Use these values with care.

Re: File systems become RD only.

macosta — Thu, 11 Jun 2009 01:26:21 GMT

Even better would be to eliminate the cause of the connection loss. The filesystem should remain intact, since it's journalling, but by default, only metadata is protected. You could possibly end up with file data loss.

You may try as suggested above:
mount -o remount,rw /path/to/mount/point
To see if it re-enables writes.

Re: File systems become RD only.

dirk dierickx — Thu, 11 Jun 2009 05:41:44 GMT

the fs gets remounted RO as a safety feature. imagine the havoc you could create when the system is able to continue to write sometimes, but not always, on a disk with errornous connections. the fast lane to data corruption.

like others said, you need to fix this connection loss issue. the data path to your disk is unreliable.