Hi Aleskol,
many thanks for suggestion. i've checked DNS resolution for ESX, 3par storage, backup hosts. all are OK - names are resolvable how they should be in small letters.
i've checked debug file and noticed that he is trying to resolve volume to device files at backup host [marked in red color].
but still i couldn't find any solution of this problem.
i see some warning at /var/log/message [backup host] but not sure if it is the reason of failure.
kernel: sd 3:0:6:56: Warning! Received an indication that the LUN assignments on this target have changed. The Linux SCSI layer does not automatically remap LUN assignments.
#### debug logs
[199] 2016-08-18 23:14:02.147 ("/integ/smis/Communication/Connections/IpcConnection.cpp $Rev: 9836 $ $Date:: 2010-06-15 07:30:58 ":317)
23468 [199] <<=== (5) } /* IpcConnection::send */
23469 [199]
23470 [100] *************** SKPrintf [START] ***************
23471 [100] Tokenize the string...
23472 [100] token [0] = ^G[%1$s] From: %3$s@%4$s "%6$s" Time: %2$s
23473 %5$s
23474
23475 [100] token [1] = Major
23476 [100] token [2] = 08/18/2016 11:14:02 PM
23477 [100] token [3] = SMISA
23478 [100] token [4] = backup_host.fqdn
23479 [100] token [5] = ^G[236:52] Failed to resolve a storage volume on the host.
23480 Storage volume: %s
23481
23482 [100] token [6] = DP-2016.08.18-44-057B616AE
23483 [100] token [7] = SMISA
23484 [100] *************** SKPrintf [END] ***************
23485
23486 [ 4] 2016-08-18 23:14:02.147 ("/integ/smis/Resolver/ResolverUxImpl.cpp $Rev: 52654 $ $Date:: 2016-03-23 06:11:33 ":1016)
23487 [ 4] [REPORT 2] in ResolverUxImpl::ResStorageVolumes2DeviceFiles
23488 Marked: ("":Line:0 in '')
23489 Code is:0
23490 [Major] From: SMISA@backup_host,fqdn"SMISA" Time: 08/18/2016 11:14:02 PM
23491 [236:52] Failed to resolve a storage volume on the host.
23492 Storage volume: DP-2016.08.18-44-057B616AE
23468 [199] <<=== (5) } /* IpcConnection::send */
23469 [199]
23470 [100] *************** SKPrintf [START] ***************
23471 [100] Tokenize the string...
23472 [100] token [0] = ^G[%1$s] From: %3$s@%4$s "%6$s" Time: %2$s
23473 %5$s
23474
23475 [100] token [1] = Major
23476 [100] token [2] = 08/18/2016 11:14:02 PM
23477 [100] token [3] = SMISA
23478 [100] token [4] = backup_host.fqdn
23479 [100] token [5] = ^G[236:52] Failed to resolve a storage volume on the host.
23480 Storage volume: %s
23481
23482 [100] token [6] = DP-2016.08.18-44-057B616AE
23483 [100] token [7] = SMISA
23484 [100] *************** SKPrintf [END] ***************
23485
23486 [ 4] 2016-08-18 23:14:02.147 ("/integ/smis/Resolver/ResolverUxImpl.cpp $Rev: 52654 $ $Date:: 2016-03-23 06:11:33 ":1016)
23487 [ 4] [REPORT 2] in ResolverUxImpl::ResStorageVolumes2DeviceFiles
23488 Marked: ("":Line:0 in '')
23489 Code is:0
23490 [Major] From: SMISA@backup_host,fqdn"SMISA" Time: 08/18/2016 11:14:02 PM
23491 [236:52] Failed to resolve a storage volume on the host.
23492 Storage volume: DP-2016.08.18-44-057B616AE
Thanks,
DPX