NFS4 problems -

[Bob Goodwin - Zuni, Virginia, USA]

On 30/11/12 21:02, Ed Greshko wrote:
> Well....  First of all /nfs4exports doesn't take up any space.  They are bind mounts which is analogous to symbolic links.  I'll illustrate using my nfs server.

    My problem is that saving to /mnt/nfs4exports/home stores the data
    in the 50G root space. I did not realize that was happening until
    writing ground to a halt.

> [egreshko at misty ~]$ df -h
> Filesystem                 Size  Used Avail   Use% Mounted on
> /dev/mapper/icy3-root       16G   11G  4.3G    71% /
> /dev/sda1                   388M  47M  321M    13% /boot
> /dev/mapper/icy5-opt        9.7G  5.6G 3.6G    62% /opt
> /dev/mapper/icy5-syntegra   77G   41G   33G    55% /syntegra
> /dev/mapper/icy3-VMware     308G  231G   62G   79% /opt/VMware
> /dev/mapper/icy5-home       581G  323G  229G   59% /home

    My system:

    [root at box8 bobg]# df -h
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/mapper/vg_box8-lv_root
                            50G   49G     0 100% /
    tmpfs                 1.9G  112K  1.9G   1% /dev/shm
    /dev/sda1             485M   72M  388M  16% /boot
    /dev/mapper/vg_box8-lv_home
                           862G  520M  818G   1% /home

>
> [egreshko at misty ~]$ exportfs -v
> /nfs4exports/syntegra
>                  192.168.0.0/24(rw,wdelay,nohide,insecure,root_squash,no_subtree_check)
> /nfs4exports/myhome
>                  192.168.0.0/24(rw,wdelay,nohide,insecure,root_squash,no_subtree_check)
> /nfs4exports    192.168.0.0/24(ro,wdelay,insecure,root_squash,no_subtree_check,fsid=0)

    My NFS looks like this:

    [root at box8 bobg]# exportfs -v
    /nfsexports
    192.168.1.0/24(rw,wdelay,insecure,no_root_squash,no_subtree_check,fsid=0)
    /nfsexports/data
    192.168.1.0/24(rw,wdelay,insecure,no_root_squash,no_subtree_check)
    /nfsexports/home
    192.168.1.0/24(rw,wdelay,insecure,no_root_squash,no_subtree_check)

>
> And my /etc/fstab contains the following....
>
> /syntegra               /nfs4exports/syntegra   none    rw,bind 0 0
> /home/egreshko          /nfs4exports/myhome     none    rw,bind 0 0

    My fstab:

    [bobg at box7 ~]$ cat /etc/fstab

    #
    # /etc/fstab
    # Created by anaconda on Tue Aug  7 08:37:16 2012
    #
    # Accessible filesystems, by reference, are maintained under '/dev/disk'
    # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for
    more info
    #
    UUID=4ce86523-2d45-4174-85e9-fd298e4516c8 / ext4    defaults        1 1
    UUID=1a9d0937-2247-4cbc-b27d-4775c7453dba /boot ext4   
    defaults        1 2
    UUID=96a666e2-73ac-4f5f-98bc-4a6a9383491f /home ext4   
    defaults        1 2
    UUID=9cb5a7e0-c752-4563-b7f5-663980e090e3 swap swap   
    defaults        0 0


    192.168.1.8:/nfs4exports/     /mnt/BOX8     nfs4     rw      0 0
    192.168.1.8:/nfs4exports/home/   /mnt/HOME1      nfs4    rw,bind 0 0
    192.168.1.8:/nfs4exports/data/   /mnt/DATA1      nfs4    rw,bind 0 0
    192.168.1.48:/SRVR1              /mnt/BOX48      nfs4
    defaults,rw,user 0 0

>
> So, you can see that the /syntegra partition uses 41GB and /home uses 323GB.  None of that space is reflected on the / partition which has only 16GB allocated and 11GB used.  If you combine that with /opt only 17GB is being used by the OS.
>
> On the other hand, you have allocated 50GB to / and have used 49GB while /home is way under-utilized.
>
> I suspect you have non-OS data on the / partition which can be moved to /home.
>
> I would first start out by identifying what directory structure on / is using so much space. For example, you may have a /data directory that you've added which could be moved to /home.

    Yes, I can move the files but I have to get the tree set up
    correctly. I will wait a while until I am fully functional before
    attempting to muddle through that.

    Tnx,

    Bob


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box7