On 03/21/2011 04:09 AM, NeilBrown wrote:
On Mon, 21 Mar 2011 03:24:50 +0100 Dennis Jacobfeuerborn
<d.jacobfeuerborn@xxxxxxxxxxxx> wrote:
Hi,
I have a storage system that is exporting many directories to multiple
clients resulting in a lot of mountpoints (156) on each client. What I'm
trying to do is to create a single directory on the server and then use
mount --bind to mount all the different directories (which are stored on
different LVM volumes) into this single export directory and finally export
this directory to the clients.
Now the exports man-page mentions the crossmnt option but it also mentions
that it cannot be used if I want to export the directory to multiple
clients. Is there another way to accomplish something like this?
Just export the top directory with 'crossmnt' - it should work fine.
The 'multiple clients' thing only affects 'nohide' and I think it only
affected it back in 2.4 days.
Lots changed with 2.6, but maybe not enough of the man page changed :-(
So try with 'crossmnt' and if it doesn't work, then come back with details.
I've tried this now but it doesn't seem to work. This is the setup so far:
===========
On the server I've created the bind mounts like this:
/mnt/vg0/vol01/country/de/a on /exports/country/de/a type none (rw,bind)
/mnt/vg0/vol03/country/de/b on /exports/country/de/b type none (rw,bind)
...
Then I put the following line in /etc/exports:
/exports
192.168.0.0/255.255.255.0(rw,anonuid=96,anongid=96,secure,no_root_squash,wdelay,sync,crossmnt,no_subtree_check)
additionally these exports exist for each volume:
/mnt/vg0/vol01/country
213.131.252.0/255.255.255.0(rw,anonuid=96,anongid=96,secure,no_root_squash,wdelay,sync)
===========
On the client I've mounted this export like this:
mount -o rw,noatime,tcp,rsize=8192,hard,intr,nfsvers=3,addr=192.168.0.8
192.168.0.8:/exports/country/de /data/country/de
This succeeds and I can see the letters a-z in /data/country/de however
these directories are all empty so crossing the filesystem border doesn't
seem to work.
===========
The server is an openfiler appliance:
[root@exonas900 ~]# conary q|grep nfs
libnfsidmap=0.20-1.1-1
nfs-client=1.0.10-4.6-1
nfs-server=1.0.10-4.6-1
nfs-utils=1.0.10-4.6-1
[root@exonas900 ~]# uname -a
Linux exonas900 2.6.26.8-1.0.11.smp.gcc3.4.x86.i686 #1 SMP Sat Jan 10
22:09:09 GMT 2009 i686 i686 i386 GNU/Linux
===========
The client I'm testing with is a Centos 5 system:
[root@wmembf10 ~]# rpm -qa|grep nfs
nfs-utils-lib-1.0.8-7.6.el5
nfs-utils-1.0.9-47.el5_5
[root@wmembf10 ~]# uname -a
Linux wmembf10.tmm.cvsn.de 2.6.18-194.11.4.el5xen #1 SMP Tue Sep 21
05:40:24 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
Regards,
Dennis
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