[fuse-devel] zfs fuse volumes - nfs sharing problems

[Jorge G. <jor...@wh...>]

Hi everybody,

We are facing a tricky problem which involves fuse volumes, zfs and nfs.
We are using linux (debian) and kernel 3.0.8, also latests versions of 
fuse library and zfs-fuse.

We have zfs file systems (working over zfs-fuse library) and we need to 
share them over nfs. In most cases it works fine. But when shared volume 
gets stressed, we start getting "stale file handlers" problems on clients.

We have tried sharing the volume with exports, also with 'zfs set 
sharenfs=on', putting same fsid on server and client, setting a lot of 
combinations of mount options on client 
(defaults,timeo=20,retrans=5,rsize=8192,wsize=8192,intr ...). But, 
although the problem reduces itself with some configurations, ends 
failing always.

To reproduce the error, here is a simple scenario:

/Server /

    zfs set sharenfs=on pool1/vol1


/Client /

    mount x.x.x.x:/mnt/pool1/vol1 testNFS


Execute the little script I post at the end of this mail at the nfs 
volume mountpoint on server.
Wait for the end of directory creation process. A few seconds after, try 
to do several "ls -l" at client and you should get the stales file 
handler errors:

    #!/bin/bash
    BASE_DIR=
    if [ ! -z $1 ]; then
       BASE_DIR=$1
    fi

    for D in  $(seq 1 1 100); do

       if [ -z $BASE_DIR ]; then
         DIR="dir$D"
       else
         DIR="$BASE_DIR/dir$D"
       fi
       if [ ! -d $DIR ]; then
         echo -n "$DIR-> "
         mkdir $DIR
         for F in $(seq 1 1 100); do
           echo -n "."
           FILE=$(seq 1 1 100)
           echo $FILE > $DIR/$F.txt
         done
         echo " done"
       fi
    done
    if [ ! -e $BASE_DIR/lista_ficheros.txt ]; then

       find $BASE_DIR -type f \( ! -iname "backup.cpio" \) >
    $BASE_DIR/lista_ficheros.txt
    fi
    for D in  $(seq 1 1 20); do

       cat $BASE_DIR/lista_ficheros.txt | cpio -o > $BASE_DIR/backup.cpio
    done

Thank you all in advance for any help,

Jorge Gea


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