On 2005-09-03T01:57:31, Daniel Phillips <phillips@xxxxxxxxx> wrote:
> The only current users of dlms are cluster filesystems. There are zero users
> of the userspace dlm api.
That is incorrect, and you're contradicting yourself here:
> What does have to be resolved is a common API for node management. It is not
> just cluster filesystems and their lock managers that have to interface to
> node management. Below the filesystem layer, cluster block devices and
> cluster volume management need to be coordinated by the same system, and
> above the filesystem layer, applications also need to be hooked into it.
> This work is, in a word, incomplete.
The Cluster Volume Management of LVM2 for example _does_ use simple
cluster-wide locks, and some OCFS2 scripts, I seem to recall, do too.
(EVMS2 in cluster-mode uses a verrry simple locking scheme which is
basically operated by the failover software and thus uses a different
model.)
Sincerely,
Lars Marowsky-Brée <lmb@xxxxxxx>
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High Availability & Clustering
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