HACMP, NFS cross-mount problem. Can not move resource group

UNIX AIX
1

Hi,
I'm new to HACMP. Currently I setup a cluster with nfs cross-mount follow this guide:

kristijan.org  NFS cross-mounts in PowerHA/HACMP

My cluster has two nodes: erp01 and erp02.
I'm using nfs4 with filesystem for nfs is: /sapnfs
Cluster start without problems. But I cannnot move RG (with NFS mount) from erp01 to erp02. hacmp.out shows that erp01 stucks at umount /sapnfs.
Another RGs (without NFS mount) can move smoothly.

Where can I start to debug?

TIA,
giobuon

---------- Post updated 09-14-11 at 01:45 AM ---------- Previous update was 09-13-11 at 07:43 PM ----------

I solved my problem by placing command

rexec   erp01   fuser -kxuc /mount_point
rexec   erp02   fuser -kxuc /mount_point
exit 0

on app stop script.

But I got another problem when mount this share from another host (erp03).

root@erp03# mount /sapmnt
mount: 1831-011 access denied for erp01:/sapnfs
mount: 1831-008 giving up on:
erp01:/sapnfs
The file access permissions do not allow the specified action.

Here's some info:

root@erp01# more /usr/es/sbin/cluster/etc/exports
/sapnfs -public,access=erp03:erp02_stb:erp02_boot:erp02:erp01_stb:erp01_boot:erp01,vers=4,root=erp03:erp02_stb:erp02_boot:erp02:erp0
1_stb:erp01_boot:erp01,hasrv=erp0

root@erp01# lsnfsexp
/sapnfs -public,access=erp03:erp02_stb:erp02_boot:erp02:erp01_stb:erp01_boot:erp01,vers=4,root=erp03:erp02_stb:erp02_boot:erp02:erp01_stb:erp01_boot:erp01,hasrv=erp01

I added the same host entries on all nodes.

Please help!
TIA,
giobuon

2

do you have the same vg major number on both nodes, for the vg you want to export the filesystem from?

ls -l /dev/vgname
3

Is the hostname erp03 registered as such in DNS or in /etc/hosts on erp01?
These type of problems are usually caused by (reverse) DNS resolution.

4

My bad.
In host erp03, I need to specify nfs version is 4 (after set nfs local domain and start nfsrgyd).
Thanks for all your replies.