[CentOS] logical volume over NFS permissions problem

Thu Jun 25 07:52:55 UTC 2009
Tomas Ruprich <ruprich at uikt.mendelu.cz>

Hi all,
i've problem with mounting logical volumes over NFS. 

On NFS server, i have following logical volume
[root at nfs_server ~]# lvdisplay
  --- Logical volume ---
  LV Name                /dev/escience/vv_25
  VGnfs_servernfs_servernfs_servernfs_servernfs_server      escience
  LV UUID                iMhNq7-iC7L-VTDO-Xcwv-a6yv-sEAD-EZWASV
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                5.00 GB
  Current LE             1280
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2


This logical volume is mounted on NFS server, the group information is 
taken from LDAP server.
[root at nfs_server ~]# mount | grep vv_25
/dev/mapper/escience-vv_25 on /export/escience/vv_25 type ext3 (rw)
[root at nfs_server ~]# ls -ld /export/escience/vv_25
drwxrwx--- 3 root vv153 4096 Jun 24 16:04 /export/escience/vv_25


But when i mount /export/escience on the nfs client, i'm missing all the
permissions and ownership informations:
[root at client ~]# mount.nfs nfs_server:/export/escience/ /mnt/escience
[root at client ~]# ls -ld /mnt/escience/vv_25
drwxr-xr-x 2 root root 4096 2009-06-24 16:04 vv_25


The setting of NFS exports is following:
[root at nfs_server ~]# cat /etc/exports
/export/escience     client(rw,sync,no_root_squash)
[root at nfs_server ~]# exportfs -v
/export/escience     client(rw,wdelay,no_root_squash,no_subtree_check,anonuid=65534,anongid=65534)


Server is running latest CentOS 5.3
[root at nfs_server ~]# cat /etc/redhat-release
CentOS release 5.3 (Final)
[root at nfs_server ~]# uname -a
Linux nfs_server 2.6.18-128.1.14.el5 #1 SMP Wed Jun 17 06:38:05 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

No denials from selinux, client's IP is completely opened on firewall. 

Is there some possibility to debug the NFS mount process? I don't see
nothing more then verbose mode in man, which doesn't provide much 
informations :( Or is it some configuration issue?


thanks for help,
  Tomáš Ruprich <ruprich at uikt.mendelu.cz>
  DCD IICT MUAF Brno <www.mendelu.cz, is.mendelu.cz>
  tomyk at jabber.cz