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Error: read only filesystem - How to resolve it?

Postby chandranjoy » Thu Sep 02, 2010 4:38 pm

Why am I getting "read only filesystem" error messages when the filesystem is mounted rw?

If the kernel finds fatal corruption on the disk or if certain key IOs like journal writes start failing, the kernel may remount the filesystem as read-only. This is because the filesystem can no longer maintain write integrity under these conditions. Any such behavior will be thoroughly logged in /var/log/messages.

Should this happen, backup your recent data as this may be a symptom of an impending disk failure. Perform filesystem checks on the disk using e2fsck as soon as possible and use the -c option to enable badblock checking. The normal fsck may not detect all the errors and return clean. For example:

e2fsck -c /dev/sda3
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