Originally posted by: Gullio

hello i have a strange problem on an lpar with aix 7.1.

when i present an existing disk form a san the disk size is 0 byte. if i present a new disk the disk have the correct size.

here some info( the disk is hdisk2):

# lspv
hdisk1          0002aa4b0c1966ee                    swap            active      
hdisk12         0002aa4b07d9c9b0                    rootvg          active      
hdisk0          none                                None                        
hdisk2          none                                None                       

# lsattr -El hdisk2
PCM             PCM/friend/fcpother                                 Path Control Module              False
PR_key_value    none                                                Persistant Reserve Key Value     True
algorithm       fail_over                                           Algorithm                        True
clr_q           no                                                  Device CLEARS its Queue on error True
dist_err_pcnt   0                                                   Distributed Error Percentage     True
dist_tw_width   50                                                  Distributed Error Sample Time    True
hcheck_cmd      test_unit_rdy                                       Health Check Command             True
hcheck_interval 60                                                  Health Check Interval            True
hcheck_mode     nonactive                                           Health Check Mode                True
location                                                            Location Label                   True
lun_id          0x1000000000000                                     Logical Unit Number ID           False
lun_reset_spt   yes                                                 LUN Reset Supported              True
max_retry_delay 60                                                  Maximum Quiesce Time             True
max_transfer    0x40000                                             Maximum TRANSFER Size            True
node_name       0x500507680d00de2d                                  FC Node Name                     False
pvid            none                                                Physical volume identifier       False
q_err           yes                                                 Use QERR bit                     True
q_type          simple                                              Queuing TYPE                     True
queue_depth     8                                                   Queue DEPTH                      True
reassign_to     120                                                 REASSIGN time out value          True
reserve_policy  no_reserve                                          Reserve Policy                   True
rw_timeout      30                                                  READ/WRITE time out value        True
scsi_id         0x11000                                             SCSI ID                          False
start_timeout   60                                                  START unit time out value        True
timeout_policy  fail_path                                           Timeout Policy                   True
unique_id       332136005076380810233DC0000000000001704214503IBMfcp Unique device identifier         False
ww_name         0x500507680d08de2d                                  FC World Wide Name               False

# lspath
Enabled hdisk1  vscsi0
Enabled hdisk12 vscsi0
Enabled hdisk0  fscsi0
Enabled hdisk0  fscsi0
Enabled hdisk0  fscsi1
Enabled hdisk0  fscsi1
Enabled hdisk2  fscsi0
Enabled hdisk2  fscsi0
Enabled hdisk2  fscsi1
Enabled hdisk2  fscsi1

# bootinfo -s hdisk2
0

i have mounted this lun in another lpar and it see the correct value:

# bootinfo -s hdisk2
153600
#

please let me understand why this appens(obviously the disk cannot be accessed from the node on 0 byte)