scsimgr_esdisk.7 (2010 09)

s
scsimgr_esdisk(7) scsimgr_esdisk(7)
sistent Reservation
ALL: Disable all functions
NONE: Enable all functions
infinite_retries
_enable
Enable or disable infinite retries of I/Os
May be:
true (1): enable
false (0): disable
RW Boolean
retry_delay
_enabled
Enables or disables support of retry delay timer
codes returned by devices complying with
SAM-4 (SCSI Architecture Model 4), in case of
congestion. If set to false (0), retry delay timer
codes are ignored. If set to true (1), retry delay
timer codes are taken into consideration, when
handling congestion.
May be:
true (1): enable retry delay timer codes.
false (0): disable disable retry delay timer
codes.
RW boolean
Failed LUN path connectivity test. Determines
whether the system should automatically test
the connectivity of a failed LUN path and if so
which kind of test must be performed.
May be set to:
none: No connectivity test should be per-
formed.
basic: Basic connectivity test including Stan-
dard Inquiry command, should be performed.
extended: Extended connectivity test includ-
ing Standard Inquiry and Test Unit Ready
(TUR) commands should be performed.
ping_type RW string
Failed LUN path recovery policy. Determines
when a failed LUN path should be considered
back online when automatic connectivity test is
enabled.
May be set to:
immediate: Upon a successful connectivity
test.
count_based: after a number of consecutive
successful onnectivity tests specified by the
attribute ping_count_threshold
.
time_based: Upon sustained successful con-
nectivity tests within the time period specified
in the attribute ping_time_threshold.
ping_recovery RW string
ping_time _thres-
hold
Minimum time in seconds, of sustained success-
ful connectivity tests before a failed LUN path
is considered back online.
Range: 0 - 0xFFFFFFFF
RW uint32
ping_count _thres-
hold
Minimum number of consecutive successful
connectivity tests before a failed LUN path is
considered back online.
Range: 0 - 0xFFFFFFFF
RW uint32
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
LUN 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: September 2010 − 5 − Hewlett-Packard Company 5