Thanks for your reply ravager, shockneck, minntekmikey

My oslevel is 5300-06-01-0000

shockneck you mention something about FC (Fibre Channel). Now you mention I think this could be the problem.

My FC adapters go to two switch and then go to the main swith. In a few days the two switch are going to dissapear and all my fc adapters go direct to the main switch.

Because some weeks ago I can do a mksysb. but now in any partition I can´t make a mksysb.

I send the output of the command

$ lsattr -El rmt3
alt_pathing no Enable Alternate Pathing Support True
autoload no Use Autoloading Feature at End-of-Tape True
block_size 0 Block Size (0=Variable Length) True
compress yes Use Hardware Compression on Tape True
debug_trace no Debug Trace Logging Enabled True
dev_status N/A False
devtype ULT3580- Device Type False
location Location True
logging no Activate volume information logging True
lun_id 0x0 Logical Unit Number True
max_log_size 500 Maximum size of log file (in # of entries) True
new_name New Logical Name True
node_name 0x500308c143cae001 World Wide Node Name False
primary_device rmt3 Primary Logical Device False
retain_reserve no Retain Reservation False
rew_immediate no Use Immediate Bit in Rewind Commands True
scsi_id 0x158e8 SCSI Target ID True
space_mode SCSI Backward Space/Forward Space Record Mode True
trace_logging no Trace Logging Enabled True
trailer_labels no Trailer Label Processing True
ww_name 0x500308c143cae002 World Wide Port Name False

Thanks for your tips

Greetings