Alan Cox wrote:
> On Tue, Jun 10, 2008 at 09:46:33AM -0400, Chuck Anderson wrote:
>> filesystem metadata being written out to disk that jounaling
>> filesystems rely on? If so, should we perhaps rethink the decision to
>> use LVM by default on Fedora installs?
>
> I would agree with that regardless (although LVM barrier handling if it is
> broken does want fixing - I was under the impression it was ok). My boxes
> are much faster without LVM so I always turn it off.
LVM barriers aren't so much broken as simply un-implemented by design.
static int dm_request(struct request_queue *q, struct bio *bio)
{
...
/*
* There is no use in forwarding any barrier request since we can't
* guarantee it is (or can be) handled by the targets correctly.
*/
if (unlikely(bio_barrier(bio))) {
bio_endio(bio, -EOPNOTSUPP);
return 0;
}
... and somebody should probably measure the lvm overhead in general, I
suppose. :)
-Eric
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