On 08/09/11 07:23, Emmett Culley wrote:
Today I suddenly have two VMs that have read only file systems. The host is CentOS 6, as are the two VMs with this problem.
Disclaimer: I can't claim this matches your circumstance exactly, but it is something you might check.
I have seen problems with LVM partitions in KVM guests being unwritable, despite being mounted read-write, on CentOS5.6 (host and guest). Specifically, I was booting a guest from the CentOS live CD in order to fix /etc/fstab on the root partition, which was LVM, but I could not save my changes.
Executing 'vgscan' resolved my problem; I'm not clear exactly why, but I could then remount and write successfully. You might also try 'vgchange -ay' if that doesn't work.
Perhaps: - boot with liveCD .iso in a virtual CD drive - check whether VolGroup-lv_root is mounted and writeable (use mount, lvdisplay, touch etc.) - if not, unmount it, run vgscan - remount it, and check for writability again
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