So far, there were 2 problems:
1. a disk in photon11 was giving a smart error. the disk is of 1 TB.
2. it is not possible to access ph00-data3. this is giving a timeout error.
Solutions:
1. we extracted the disk supposed to be out. we will check it and in case resend it back to Seagate, since it's under warranty conditions still. in the meanwhile we have substituted it with a 1.5 TB disk (giving 1 TB of free space)
2. we agreed on shutting down the machines on june, 14th. during that day probably nobody needs to use the disks since we will be in udine. we do that since there's the possibility we simply need to reboot the machine.