NFS processes locking up!!
kris at obsecurity.org
Thu Jun 1 18:06:32 PDT 2006
On Thu, Jun 01, 2006 at 03:02:53PM -0700, Mark Morley wrote:
> Hi all,
> We have an NFS server (amd64) running FreeBSD 6.1-STABLE. It serves a dozen
> or so clients which are a mix of FreeBSD 4.11 and 6.1-STABLE. All NFS traffic
> is on a dedicated gigabit switched network.
> Periodically we have a problem where it will stop serving up files. Running 'ps'
> on the server shows a number of processes stuck in the 'D' state -- "a process in
> disk (or other short term, uninter-ruptible) wait".
> Usually this includes all the nfsd processes as well as any others that are trying
> to access the same disk drive. Any commands issued like 'du', 'sync', etc. go into
> the same state and never exit. It is impossible to kill any of these processes.
> We can pretty much force this to happen by running a large 'find' or something
> similar on the exported file system, although it will happen itself eventually
> without any such commands being run.
> Our only option (as far as we can tell) is to reboot the server, which results in
> a very long fsck period (it's over a terrabyte of disk space).
> This doesn't seem to be a hardware issue. This is a brand new server in all respects
> (all new hardware, new RAID) and we saw the exact same issue on the machine that it
> replaced (which was running 4.11 on i386).
> Any thoughts on this? Any more info I should provide?
Please post your kernel config.
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