lockd goes into D state on RHEL5 NFS (xen) server
George Magklaras
georgios at biotek.uio.no
Thu Aug 14 12:45:02 UTC 2008
Yeap. It is a big issue and RedHat bugzilla No:453094 could give
everyone more info. Unfortunately, there is no fix other than rebooting
the NFS server :-( .
https://bugzilla.redhat.com/show_bug.cgi?id=453094
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George Magklaras
Senior Computer Systems Engineer/UNIX Systems Administrator
EMBnet Technical Management Board
The Biotechnology Centre of Oslo,
University of Oslo
http://folk.uio.no/georgios
George Magklaras wrote:
> Hi,
>
> I have a fully patched (firmware plus RHEL distro) Dell PowerEdge 2950
> with a moderate I/O load which is currently running a:
>
> Linux name 2.6.18-92.1.10.el5xen #1 SMP Wed Jul 23 04:11:52 EDT 2008
> x86_64 x86_64 x86_64 GNU/Linux
>
> kernel. My problem is that my lockd daemon goes into the D state:
> ps auxwww | grep lockd
> root 27 0.0 0.0 0 0 ? S< Aug07 0:00
> [kblockd/0]
> root 28 0.0 0.0 0 0 ? S< Aug07 0:00
> [kblockd/1]
> root 29 0.0 0.0 0 0 ? S< Aug07 0:00
> [kblockd/2]
> root 30 0.0 0.0 0 0 ? S< Aug07 0:00
> [kblockd/3]
> root 5183 0.0 0.0 0 0 ? D Aug07 0:00 [lockd]
>
> and as a result all NFS clients report that (dmesg says on the client
> side: lockd: server 192.168.8.2 not responding, still trying) and as all
> home and group areas are NFS mounted, everything appears to be frozen. I
> rule out Ethernet problems as all boxes have other services (samba,
> Apache) running properly and my Cisco switch reports no issues with
> Layer 2. :-(
>
>
> Some details:
> Amongst other things the server box NFS exports a list of large FSes
> (from 200 Gig to 3 Tbytes) to a group of Linux RHEL 4 workstations that
> also fully patched (Linux prometheus.uio.no 2.6.9-78.ELsmp #1 SMP Wed
> Jul 9 15:39:47 EDT 2008 i686 i686 i386 GNU/Linux) So, my NFS server
> export options:
>
> /biotek/dias/storage/groupareas biotroll(rw,sync,no_root_squash)
> panoptis(rw,no_root_squash) intasclepius(rw,sync) biotin(rw,sync)
> intpoetas(rw,sync,no_root_squash) intfrigg(rw,sync)
> /biotek/dias/storage/groupareas/donaldson3 hfaistos(rw,sync)
> intasclepius(rw,sync) intprometheus(rw,sync) biotin(rw,sync)
> athena(rw,sync) cn1(rw,sync,no_root_squash) cn2(rw,sync)
>
> and my RHEL mount options from the clients fstab:
>
> intdias:/biotek/dias/storage/databases /biotek/dias/storage/databases
> nfs ro,bg,hard,intr 0 0
> intdias:/biotek/dias/storage/groupareas/donaldson3
> /biotek/dias/donaldson3 nfs
> rw,bg,hard,intr,rsize=32768,wsize=32768 0 0
>
> Has anyone seen this issue and be able to advise on whether is a config
> issue?
>
> GM
>
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