[Pacemaker] NFSv4 90 sec grace period

[Michael Schwartzkopff]

> On 2011-07-13 23:08, Michael Schwartzkopff wrote:
> > Hi,
> > 
> > I am trying to set up a NFSv4 server cluster. After failover my client
> > has to wait 90 sec to be able to access the data agin.
> > 
> > I already set /proc/fs/nfsd/nfsv4leasetime to 10 but the result ist the
> > same. The server now logs:
> > 
> > Jul 13 22:44:27 debian1 kernel: [ 3512.102296] NFSD: starting 10-second
> > grace period
> > 
> > but the client waits exactly for 90 sec.
> > 
> > Any idea what might be wrong?
> 
> Cosmic rays.
> 
> More seriously, post the configuration and explain _precisely_ how you
> are testing this. May well be a bug, but no way to tell for sure (and
> hence, no way to fix) with the scarce information given. Thanks.

</long description>

I somehow tried so set up a NFSv4 server along your SLES11 tutorial. But I 
user Debian Squeeze and tried to keep it simple without the clone resources. 
So here is my config:

primitive resDRBD ocf:linbit:drbd \
	params drbd_resource="r0"
primitive resExportHome ocf:heartbeat:exportfs \
	params clientspec="192.168.87.0/24" directory="/srv/nfs/export/home" \
                    fsid="1001" options="no_root_squash,rw"
primitive resExportRoot ocf:heartbeat:exportfs \
	params clientspec="192.168.87.0/24" \
                   options="rw,crossmnt,no_root_squash" fsid="0" \               
                   directory="/srv/nfs/export"
primitive resFilesystem ocf:heartbeat:Filesystem \
	params device="/dev/drbd0" fstype="ext4" directory="/srv/nfs"
primitive resIP ocf:heartbeat:IPaddr2 \
	params ip="192.168.87.33" nic="eth0" cidr_netmask="24"
primitive resNFScommon lsb:nfs-common \
	op monitor interval="60s"
primitive resNFSserver ocf:heartbeat:nfsserver \
	params nfs_init_script="/etc/init.d/nfs-kernel-server" \
                    nfs_notify_cmd="/sbin/sm-notify" \
                    nfs_shared_infodir="/srv/nfs/infodir" \
                    nfs_ip="192.168.87.33"
group groupNFS resFilesystem resNFScommon resNFSserver \
         resExportRoot resExportHome resIP
ms msDRBD resDRBD \
	meta notify="true"
colocation col_FS_DRBD inf: groupNFS:Started msDRBD:Master
order ord_DRBD_FS inf: msDRBD:promote groupNFS:start

I can mount the NFS on a client

mount -t nfs4 -o udp 192.168.87.33:/home /mnt/home

accessing the NFS share every second during a failover results in:

while : ; do date; cat /mnt/home/testfile ; sleep 1 ; done

Thu Jul 14 20:59:11 CEST 2011
Hello world
Thu Jul 14 20:59:12 CEST 2011

cat: /mnt/home/testfile: Socket operation on non-socket
Thu Jul 14 20:59:15 CEST 2011
cat: /mnt/home/testfile: Socket operation on non-socket
Thu Jul 14 20:59:17 CEST 2011
cat: /mnt/home/testfile: Socket operation on non-socket
Thu Jul 14 20:59:20 CEST 2011
cat: /mnt/home/testfile: Socket operation on non-socket
Thu Jul 14 20:59:22 CEST 2011
(...)
Hello world
Thu Jul 14 21:01:03 CEST 2011
Hello world

That means there is a 90 sec gap accesing the file. I changed nfsv4leasetime 
already to 10 sec. But It did not help.

Any other ideas? Are the LVS as in your tutorial nescessesary?

Greetings,

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
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