scsimgr SCSI Management and Diagnostics utility on HP-UX 11i v3 (March 2008)

Preferred paths reported by device = No
Preferred LUN paths = 0
Driver esdisk Status Information :
Capacity in number of blocks = 2097152
Block size in bytes = 512
Number of active IOs = 0
Special properties =
Maximum number of IO retries = 45
IO transfer timeout in secs = 30
FORMAT command timeout in secs = 86400
START UNIT command timeout in secs = 60
Timeout in secs before starting failing IO = 45
IO infinite retries = true
Example of condition where to run ‘scsimgr activate’ command
The following output of ‘scsimgr get_info all_lpt’ shows four lunpaths for disk54. The
asymmetric state of lunpath17 and lunpath45 is ‘ACTIVE/OPTIMIZED’. For lunpath8 and lunpath30
it is ‘ACTIVE/NON-OPTIMIZED’. From the mass storage stack perspective, lunpath8 and lunpath30
are not used for I/O transfer until lunpath17 and lunpath45 become unavailable.
If lunpath45 becomes unavailable, only lunpath17 will be used for I/O transfer to disk54. This may
have a negative impact on the aggregate I/O throughput on certain devices. To maintain the same
aggregate I/O throughput on such devices, run the command ‘scsimgr activate’ on disk54 to
activate lunpath8 and lunpath30 and enable them to be used for I/O transfer.
After the ‘scsimgr activate’ command has executed successfully, the output of ‘scsimgr
get_info all_lpt’ shows that lunpath8 and lunpath30 asymmetric state is now
‘ACTIVE/OPTIMIZED’, lunpath17 asymmetric state is ‘ACTIVE/NON-OPTIMIZED’, and lunpath45
remains unavailable (‘SCSI services internal state’ is ‘FAILED’) The asymmetric state of lunpath45 does
not matter and represents a stale value.
# scsimgr
get_info all_lpt -D /dev/rdisk/disk54
STATUS INFORMATION FOR LUN PATH : lunpath8
Generic Status Information
SCSI services internal state = STANDBY
Open close state = STANDBY
Protocol = fibre_channel
EVPD page 0x83 description code = 1
EVPD page 0x83 description association = 0
EVPD page 0x83 description type = 3
World Wide Identifier (WWID) = 0x600508b300903330ec569c5839ab003c
Total number of Outstanding I/Os = 0
Maximum I/O timeout in seconds = 30
Maximum I/O size allowed = 2097152
Maximum number of active I/Os allowed = 8
Maximum queue depth = 8
Queue full delay count = 0
Asymmetric state = ACTIVE/NON-OPTIMIZED
Device preferred path = No
Relative target port identifier = 2
Target port group identifier = 2
STATUS INFORMATION FOR LUN PATH : lunpath17
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