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xen-users
Re: [Xen-users] Bad experience in mounting a domU disk
On Wednesday 04 June 2008, Alain Barthe wrote:
> I don't understand how a read-only mount can corrupt a filesystem. Does it
> mean that something is written on the device, even if it is read-only ? Or
> does the read-only mount disturb the regular disk activity that is mounted
> rw elsewhere ?
remember that even a r/o mount uses cache, so if somebody else (the DomU)
writes to the filesystem, the Dom0 cache will be wrong and inconsistent.
this inconsistency has been known to hang the r/o domain.
i was surprised that the FS was corrupted on disk, but i guess the Dom0
process that serves the block device to DomU have it as r/w, but doesn't know
about DomU's caches. usually it's OK, but it might have interfered with the
r/o FS's cache, on the same Dom0.
--
Javier
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