It's probably because the io was cached in page cache and then flushed and hung after hitting the failure condition which happened to coincide with another file creation operation.
> Then it appears to be a DRBD issue, what if you export via NFS the DRBD
> volume and write a large file to it? Does it also stall out after 700MBs?
i had tested it, and it's, maybe, not exactly the same problem, because
the Traffic stops on new File generation and not in the middle of a file
> Did you config both volumes properly? Maybe set 1 to 10GB but
> accidentally set the other to 1GB and are storing the metadata on the
> volume which takes 256MB off the ceiling making the accidental 1GB
> volume 756MB?
On both Nodes i created the LVs using the command
#lvcreate -n "Testing" -L2G VOLGROUP
I will try now to create a greater LV to see if the problem then goes away.
I suspect you did the right thing and will more then likely see the same problem with a larger LV.
Yes, that will be your best bet.
> Did you also report this to the DRBD list?
No, but i think i will report my problem there too.
Also there is a trade-off one must make with the latest software between performance/features and stability.
As soon as 8.3 becomes production stable CentOS extras will carry it. In the meanwhile I highly recommend using DRBD from CentOS repos. You could also petition the CentOS list for a version upgrade to DRBD the maintainers are very responsive. The advantage of using the packaged version is you do not have to maintain a build environment and stay on top of revisions and updates as that would happen as part of your OS patch process.
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