HP StorageWorks Storage Mirroring for Linux User's Guide (T2558-96078, February 2008)

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StatsMaxObjects This entry is no longer used.
StatsPort Port used by DTStat to gather Storage Mirroring statistics
Values:
1025 - 65535
Default: 1106
If you change this value, the source daemon must be stopped and restarted to implement the
change.
StatsShmSize This entry is no longer used.
StatsWriteInterval Interval, in minutes, in which statistics are written to the
statistic.sts file
Values: 0 - 65535
Default: 5
SystemMemoryLimit Set by the Storage Mirroring daemon, each time it is started, to record the amount of available
memory.
TargetPaused Internal setting that indicates if the target machine is paused. Do not modify this setting.
TargetPausedVirtual Internal setting that indicates which target machines are paused. Do not modify this setting.
TCPBufferSize Size of the TCP/IP buffer in bytes.
Values: 4096-7500000
Default:
37500
The default setting creates a TCP window that will accommodate most environments. In most
environments, this value will not need to be adjusted. However, if your Storage Mirroring
network has a long end-to-end route and the throughput is not where you would expect it to be,
then adjusting this parameter may have beneficial results. This value is the bandwidth delay
product, which is calculated using the bandwidth of the network (in bits/second) times the round
trip time (in seconds) between the two ends. Some recommended settings to improve Storage
Mirroring throughput performance are:
 Gigabit LAN—The setting should be changed to 375000.
 WAN—The setting should be adjusted to 130000.
While the calculations are fairly straight forward, the values that have been suggested are not
exact because they depend on round trip time. Some improvements could be gained by adjusting
these values either higher or lower. The value suited for your environment can best be
determined through trial and error testing.
TempDir Temporary directory used when replicating encrypted files.
TGCloseDelay The length of time, in milliseconds, a file is held open on the target
Values: 0-2000
Default:
1000
If disk caching on the target is disabled, the target system may be slow during a mirror. If so,
descreasing this setting to 100, 10, and 0 will result in incremental improvements, with 0
returning the system performance to normal.
TGDisableAttribute
Replication
Specifies whether or not the attributes compression, ACL, and file mask are written to the
target during mirroring and replication
Values:
(0) Enable attribute replication
(
1) Disable attribute replication
Default: 0
TGExecutionRetry
Limit
The number of times an unfinished operation will be retried on the target before it is discarded. If
this value is set to zero (
0), an operation will never be discarded and will be retried on the target
until it is applied.
Values: 0 - 65536
Default: 0
Program Setting Description