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Old 08-14-2008, 12:27 PM
George Magklaras
 
Default lockd goes into D state on RHEL5 NFS (xen) server

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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Old 08-14-2008, 12:45 PM
George Magklaras
 
Default lockd goes into D state on RHEL5 NFS (xen) server

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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