Here is the Storage Pool message:

[root@node3 ~]# scli --query_storage_pool --protection_domain_name Fab1 --storage_pool_name HDD

Storage Pool HDD (Id: eed4df9d00000000) has 8 volumes and 0 Bytes available for volume allocation

        The number of parallel rebuild/rebalance jobs: 2

        Rebuild is enabled and using No-Limit policy

        Rebalance is enabled and using No-Limit policy

        Background device scanner: Mode: device_only, Bandwidth Limit 1024 KBps per device

        Zero padding is disabled

        Spare policy: 15% out of total

        Uses RAM Read Cache

        RAM Read Cache write handling mode is 'passthrough'

        56.2 TB (57555 GB) total capacity

        90.4 GB (92580 MB) unused capacity

        0 Bytes snapshots capacity

        47.7 TB (48832 GB) in-use capacity

        0 Bytes thin capacity

        47.7 TB (48832 GB) protected capacity

        0 Bytes failed capacity

        0 Bytes degraded-failed capacity

        0 Bytes degraded-healthy capacity

        0 Bytes unreachable-unused capacity

        0 Bytes active rebalance capacity

        0 Bytes pending rebalance capacity

        0 Bytes active fwd-rebuild capacity

        0 Bytes pending fwd-rebuild capacity

        0 Bytes active bck-rebuild capacity

        0 Bytes pending bck-rebuild capacity

        0 Bytes rebalance capacity

        0 Bytes fwd-rebuild capacity

        0 Bytes bck-rebuild capacity

        0 Bytes active moving capacity

        0 Bytes pending moving capacity

        0 Bytes total moving capacity

        8.4 TB (8633 GB) spare capacity

        47.7 TB (48832 GB) at-rest capacity

        0 Bytes decreased capacity

        Primary-reads                            0 IOPS 0 Bytes per-second

        Primary-writes                           0 IOPS 0 Bytes per-second

        Secondary-reads                          0 IOPS 0 Bytes per-second

        Secondary-writes                         0 IOPS 0 Bytes per-second

        Backward-rebuild-reads                   0 IOPS 0 Bytes per-second

        Backward-rebuild-writes                  0 IOPS 0 Bytes per-second

        Forward-rebuild-reads                    0 IOPS 0 Bytes per-second

        Forward-rebuild-writes                   0 IOPS 0 Bytes per-second

        Rebalance-reads                          0 IOPS 0 Bytes per-second

        Rebalance-writes                         0 IOPS 0 Bytes per-second

Volumes summary:

        8 thick-provisioned volumes. Total size: 23.8 TB (24416 GB)

        7 volumes are unmapped

But i can not create the volume :

[root@node3 ~]# scli --add_volume --protection_domain_name Fab1 --storage_pool_name HDD --size_gb 8 --volume_name HDD9

Error: MDM failed command.  Status: Insufficient resources

Thanks a lot!