lockd goes into D state on RHEL5 NFS (xen) server

George Magklaras georgios at biotek.uio.no
Thu Aug 14 12:27:03 UTC 2008


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

-- 
--
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







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