We have a server used as NFS file server (many servers connected). The complete system frequently freeze under NFS operations. When the freeze occurs, we cannot do anything on the system, even on console.<br />
We have to hard reboot the server to get the server back.<br />
<br />
The problem can occur several times a day then be operation for several days. We have many users with different usages (many small files read/writes or very large file) so we can't know what could trigger this.<br />
<br />
We use NFS over XFS on a kernel 2.6.32-279.11.1.el6.x86_64. We upgraded to this latest kernel version from repo but it had no impact.<br />
<br />
We observed that nfsd processes (we use kernel NFS) are often in D status.<br />
We also observed via Ganglia a cpu high usage before system freeze, though memory is ok and cpu io looks fine too.
↧