On Wed, May 16, 2007 at 12:03:57PM -0500, Steven French wrote: > I thought that until a few days ago, a sequence like the following (two > nfs servers exporting the same clustered data) > > on client 1 lock range A through B of file1 (exported from nfs server 1) > on client 2 lock range A through C of file 1 (exported from nfs server 2) > on client 1 write A through B > on client 2 write A through C > on client 1 unlock A through B > on client 2 unlock A through C > > would corrupt data (theoretically could be fixed as nfsd calls lock > methods > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fd85b8170dabbf021987875ef7f903791f4f181e) Right. > but the more obvious point is that with two nfsd servers exporting the > same file data via the same cluster fs (under nfsd), the latencies can be > longer and the opportunity for stale metadata (file sizes) Hm. How could nfsd get stale metadata? I'm just (probably naively) assuming that a "cluster" filesystem attempts to provide much higher cache consistency than actually necessary to keep nfs clients happy. But, if not, it would be nice to understand the problem. --b. - To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
