setup get HDD and memory totale and free space wrong (0Mb)

when connecting for the first time to the HTTP setup GUI (http://195.154.218.88:8091/index.html)

I got for the HDD :
Configure Disk Storage
Path: /opt/membase/var/lib/membase/data Free: 0 GB

And for the memory (if creating new cluster):
RAM Available: 0 MB
Per Server RAM Quota: MB (256 MB — 0 MB)

Or for the memory (if joining existing cluster):
Attention - Prepare join failed. This server does not have sufficient memory to support the cluster quota (Cluster Quota is 14968MB per node, this server only has 0MB)!

Joining the cluster with the CLI do the same :
/opt/membase/bin/membase rebalance -c X.X.X.1:8091 -uLOGIN -pPASSWD --server-add=X.X.X.2:8091
ERROR: unable to server-add X.X.X.2:8091 (400) Bad Request
[u'Prepare join failed. This server does not have sufficient memory to support the cluster quota (Cluster Quota is 14968MB per node, this server only has 0MB)!']

On those 2 identical virtual server (Openvz virtualisation) i have :
#free -m
total used free shared buffers cached
Mem: 15992 1054 14937 0 0 0
-/+ buffers/cache: 1054 14937
Swap: 0 0 0
#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/simfs 98G 70G 23G 76% /
tmpfs 7.9G 0 7.9G 0% /lib/init/rw
tmpfs 7.9G 0 7.9G 0% /dev/shm

As you see : The code in charge of detecting hdd and memory space fails and reports 0Mb , thus prevents me from creatingor joining a cluster.

I happy to give you any info you need : just ask.

Kinds regards, Aurelien