HP-UX Reference (11i v3 07/02) - 7 Device (Special) Files, 9 General Information, Index (vol 10)

s
scsimgr_esdisk(7) scsimgr_esdisk(7)
preferred_path.
infinite_retries
_enable
Enable or disable infinite retry of I/Os. May be:
true: enable,
false: disable.
RW boolean
preferred_path Hardware path of the lunpath to use preferably for
I/O transfer, when I/O load balancing policy is set to
preferred_path.
RW string
Device
Set
Seconds to wait after a LUN transitioned out of
ONLINE state before failling I/Os.
Range: 0-600
transient_secs RW uint32
Timeout in secs of SCSI command FORMAT.
Range: 0-0xFFFFFFFF
format_secs RW uint32
Timeout in secs of SCSI command START UNIT.
Range: 0-0xFFFFFFFF
start_unit_secs RW uint32
Maximum number of I/O retries.
Range: 1-0xFFFFFFFF
max_retries RW uint32
Timeout in secs before declaring a LUN path offline.
Range: 0-600
path_fail_secs RW uint32
Maximum time in secs for the transmission of an I/O.
Range: 0-0xFFFFFFFF
esd_secs RW uint32
Maximum queue depth.
Range: 1-0xFFFFFFFE
max_q_depth RW uint32
I/O load balancing policy. May be:
round_robin,
least_cmd_load,
cl_round_robin,
preferred_path.
load_bal_policy RW string
A set of flags representing SCSI task management
and other functions. If a flag is set, the corresponding
function is disabled for the set of devices. The follow-
ing flags are currently defined:
WCE: Write Cache Enable,
RW16: 16 bytes READ/WRITE CDB,
ABT: SCSI task management function Abort Task Set,
CTS: SCSI task management function Clear Task Set,
LR: SCSI task management function LUN Reset,
WTR: SCSI task management function Warm Target
Reset,
CTR: SCSI task management function Cold Target
Reset,
BR: Bus Reset,
PR: Persistent Reservation,
WERO: Persistent Reservation WERO (Write Exclusive
Read-Only),
AERO: Persistent Reservation AERO (Access Exclusive
Read-Only).
disable_flags RW string
infinite_retries
_enable
Enable or disable infinite retries of I/Os. May be:
true: enable,
false: disable.
RW boolean
I/O Load Balancing Policy
The I/O load balancing policy attribute, load_bal_policy, is a tunable that controls how I/Os are dis-
tributed across the paths to a LUN:
• round_robin
Paths are selected in a round robin manner. This is more appropriate when all the paths to the device
have similar I/O turn-around characteristics.
HP-UX 11i Version 3: February 2007 − 2 − Hewlett-Packard Company 173