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

-- 
--
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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