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[Linux-cluster] CS4 U4 /// HA NFS / problem


We are currently trying to set up a HA NFS Sever (CS4u4, active/active). As
decribed in Cookbook we use "managed nfs service" fonctionnality with ext3 FS
type. During failover process (relocate command) we have the following problem :
On server side everything seems to be OK (exports, IP, mount points), but on
the client side time before ressource is back may last from 3 and 20 min
(apparently  stalled in "rpc_execute"). Are they any specifics options to use in
that case (NFS,ext3)?, or a well-known issue on that kernel ?

                        <fs device="/dev/sdd" force_unmount="1" fstype="ext3"
mountpoint="/tstha" name="nfsha" options=""/>
                        <nfsexport name="nfsexport1"/>
                        <nfsclient name="nfsclient1" target=""
                        <fs device="/dev/sde" force_unmount="1" fstype="ext3"
mountpoint="/tstha1" name="nfsha1" options=""/>
                        <nfsexport name="nfsexport2"/>
                        <nfsclient name="nfsclient2" target=""
                <service domain="NFSHA1" name="nfs_service1" autostart="1"
                        <ip address="" monitor_link="1"/>
                        <fs ref="nfsha">
                           <nfsexport name="nfsha">
                               <nfsclient ref="nfsclient1"/>
                <service domain="NFSHA2" name="nfs_service2" autostart="1"
                        <ip address="" monitor_link="1"/>
                        <fs ref="nfsha1">
                           <nfsexport name="nfsha1">
                               <nfsclient ref="nfsclient2"/>

on the client side:

[root xena8 ~]# ps -ef |grep df
root        85    10  0 Nov27 ?        00:00:00 [pdflush]
root        86    10  0 Nov27 ?        00:00:00 [pdflush]
root      3723     1  0 Nov27 ?        00:00:00 xinetd -stayalive -pidfile
root     31614 31262  0 10:55 pts/4    00:00:00 df
root     31648 28448  0 10:56 pts/2    00:00:00 grep df
[root xena8 ~]# cat /proc/31614/wchan
__rpc_execute[root xena8 ~]# umount /tstha
umount: /tstha: device is busy
umount: /tstha: device is busy

Thanks for help.
Alain Moullé

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