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samkhan83 08-13-2012 04:09 AM
Unable to mount nfs
 
Hi Gurus,

I am using 2.6.32-71.el6.x86_64. I have a volume mounted via NFS on my server. This volume actually resides on my storage (NetApp).

I have two problems.

1) When I create a directory on that partition as root, the owner and group defaults to nfsnobody. But when I create a directory as any other user except root, the owner and group is of that same user through which I created the directory.

2) When I try to make this server as NFS server, by sharing the volume that is already mounted as NFS, i get an error as below

[root@portaltest1 linxnfs]# exportfs -a
exportfs: Warning: /linxnfs/shared does not support NFS export.
[root@portaltest1 linxnfs]#



Can anybody help me in this regard?

Thank a lot in advance.

maniannam 08-13-2012 08:44 AM
Hello,

what is the FileSystem Type?

Regards,
maniannam

samkhan83 08-13-2012 12:40 PM
Hello,

Filesystem is NFS.

Regards.

suicidaleggroll 08-13-2012 12:47 PM
NFS is not a filesystem, it's a network protocol similar to CIFS. Maniannam is asking what the actual filesystem is, such as ntfs, ext3, etc.

#1 is normal behavior, and is caused by rootsquash on the NFS share. This means that "root" on any remote machine does not have the same permissions as "root" on the local machine, so that there is only one "root" with true global permissions on that filesystem...the one on the actual machine on which that filesystem resides.

#2 - I've never tried to re-share a NFS mount, and I don't really see the benefit. Why not just have the clients mount the original share directly instead of doubling your network overhead by daisy chaining the mount?

samkhan83 08-13-2012 12:52 PM
Very sorry to say but strangely the FS in NFS stands for file system. That makes it a filesystem doesn't it?

samkhan83 08-13-2012 12:54 PM
To further prove my point:

Code:
Filesystem    Type  1K-blocks      Used Available Use% Mounted on
/dev/mapper/vg_portaltest1-lv_root
              ext4    15227752  8161956  6292268  57% /
tmpfs        tmpfs    15473904      624  15473280  1% /dev/shm
/dev/sda1    ext4      495844    36406    433838  8% /boot
udntap-n1-sata:/vol/portaltest1_211/qt1
              nfs    54525952  14737216  39788736  28% /linxnfs

suicidaleggroll 08-13-2012 12:54 PM
You can't always take the definition of an acronym at face value.

NFS is a network protocol. Just like RAID stands for redundant array of independent disks...however RAID0, despite being a legitimate RAID implementation, has no redundancy.

samkhan83 08-13-2012 12:58 PM
Thanks suicidaleggroll, always nice to learn from people like yourself.

Can you tell me how can I check the filesystem on this partition that is shared by my storage (NetApp) and mounted on my server via NFS protocol.

According to me i am trying df -T

Regards

suicidaleggroll 08-13-2012 12:59 PM
Easiest way is to log into the server (NetApp) and run df -T there.

For example, on my local machine:
Code:
[user@client ~]$ df -T | grep raid
server:/raid  nfs    37T  326G  37T  1% /server/raid
But on the server:
Code:
[user@server ~]$ df -T | grep raid
/dev/sdc1      xfs    37T  326G  37T  1% /raid
So it's actually an XFS filesystem. NFS is just the protocol that allows me to remotely access it on my client machine.

samkhan83 08-13-2012 01:11 PM
NetApp is my storage server. I dont think df -T will work there.

Code:
udntap-n2-sas> df -T
df: Invalid option - T
usage: df [ -i | -r | -S | -s | -x ] [ -h | -k | -m | -g | -t ] [ -A | -V | -L ] [ <pathname> | <name> ]
udntap-n2-sas>

suicidaleggroll 08-13-2012 01:21 PM
You could try running "mount"

samkhan83 08-13-2012 01:24 PM
Sir, this is not a RHEL system. This is a storage system.

Code:
udntap-n2-sas> mount
mount not found.  Type '?' for a list of commands
udntap-n2-sas>

samkhan83 08-13-2012 01:25 PM
Code:
udntap-n2-sas> uname
uname not found.  Type '?' for a list of commands
udntap-n2-sas> ?
?                  fpolicy            nfsstat            smtape
acpadmin            fsecurity          nis                snap
aggr                ftp                options            snaplock
arp                halt                orouted            snapmirror
backup              help                partner            snapvault
bmc                hostname            passwd              snmp
cdpd                httpstat            ping                software
cf                  ide_savecore        ping6              source
charmap            ifconfig            pktt                sp
cifs                ifgrp              portset            stats
clone              ifstat              priority            storage
config              igroup              priv                sysconfig
date                ipsec              qtree              sysstat
dcb                ipspace            quota              timezone
df                  iscsi              radius              traceroute
disk                key_manager        rdate              traceroute6
disk_fw_update      keymgr              rdfile              ups
dns                license            reallocate          uptime
download            lock                reboot              useradmin
du                  logger              restore            version
dump                logout              rlm                vfiler
echo                lun                route              vlan
ems                man                routed              vmservices
environment        maxfiles            rshstat            vol
exportfs            mt                  sasadmin            vscan
fcadmin            nbtstat            sasstat            wcc
fcnic              ndmpcopy            savecore            wrfile
fcp                ndmpd              sectrace            ypcat
fcstat              ndp                secureadmin        ypgroup
file                netdiag            setup              ypmatch
filestats          netstat            shelfchk            ypwhich
flexcache          nfs                sis
udntap-n2-sas>

suicidaleggroll 08-13-2012 01:41 PM
It doesn't have to be RHEL in order to run mount, many NAS systems run various distributions of linux. Given that list of commands, I'd say yours does too, it's just trimmed things down quite a bit.

Either way, I don't think you need to know the underlying filesystem to answer your questions. #1 is caused by root squash. #2 seems kind of pointless anyway, but there might be a way to get around it. Why can't you simply mount the NAS directly from each machine that needs it instead of daisy chaining the mount from machine to machine?


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