[Gluster-users] Configuration validation on 32 nodes-gluster: expecting 64 TB but I have only 35 TB

[Fedele Stabile]

Hello,
I would ask to you if this configuration is valid:
32 nodes cluster with CentOS 6.6 kernel 2.6.32-504.8.1.el6.x86_64
glusterf version is 3.7.8
I have infiniband working at 40 GBs  
and on each node I have configured two bricks: 
one on a 1 TB disk with a xfs filesystem dedicated to gluster
the other with a 1 TB disk with a ext4 filesystem also dedicated to
gluster
I have configured only one big replicated volume made of 64 bricks
This is the volume configuration in summary:
Volume Name: scratch
Type: Distribute
Volume ID: fc6f18b6-a06c-4fdf-ac08-23e9b4f8053e
Status: Started
Number of Bricks: 64
Transport-type: tcp,rdma
Bricks:
Brick1: ib-wn001:/bricks/brick1/gscratch0
Brick2: ib-wn002:/bricks/brick1/gscratch0
....
Brick31: ib-wn032:/bricks/brick1/gscratch0
Brick32: ib-wn030:/bricks/brick1/gscratch0
Brick33: ib-wn001:/bricks/brick2/gsp2
....
Brick64: ib-wn032:/bricks/brick2/gsp2
Options Reconfigured:
features.inode-quota: off
features.quota: off
features.scrub-freq: daily
features.scrub: Inactive
features.bitrot: off
config.transport: tcp,rdma
performance.readdir-ahead: on
nfs.disable: true

It seems working well, but the output of df -h |grep scratch
gives this output:
ib-wn001:/scratch.rdma
                       35T   13T   22T  36% /scratch

But I expect a volume of 64 TB

Can you help me to understand?

Volume is currently used but the size is different by that expected...

Thank you to all
Fedele Stabile