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

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TGFileAlloc Indicates that Storage Mirroring allocates an entire file on the first write of a mirror operation
Values:
(
0) Disabled
(
1) Enabled
Default: 1
To help eliminate file fragmentation on the target server, Storage Mirroring should allocate the
entire file first. With extremely large files, the file allocation may take a long time. Therefore, you
may want to disable the file allocation. If you disable file allocation, you will have more
fragmentation on the target disk.
TGMirrorCapacity
High
Maximum percentage of system memory that can contain mirror data before the target signals
the source to pause the sending of mirror operations.
Values: 2-75
Default: 20
TGMirrorCapacity
Low
Minimum percentage of system memory that can contain mirror data before the target signals the
source to resume the sending of mirror operations.
Values: 1-75
Default: 15
The maximum value forTGMirrorCapacityLow is either 75 or TGMirrorCapacityHigh, which ever
is lower.
TGRetryLocked Minimum number of seconds to wait before retrying a failed operation on a target
Values: 0-65536
Default: 3
TGThreadCount Number of threads actively writing files to disk. This option takes advantage of multi-thread and
multi-processor capabilities. This is generally 2-4 threads per processor.
Values: 0 - x where x can be up to 5 times the number of disks in your system
Default: 4
TGUnfinishedOp
Event
Specifies whether or not unfinished operations on the target are logged to the Linux system log
Values:
(
0) Unfinished operation messages are not logged
(
1) Unfinished operation messages are logged
Default: 0
TGWriteCache Specifies whether or not Storage Mirroring uses the intermediate cache
Values:
(
0) Bypass the intermediate cache and write directly to disk
(
1) Do not bypass the intermediate cache
Default: 1
TGWriteFailure
BeforeNotification
Specifies the number of times an operation will be retried on the target before a notification is
sent to the source to update the
Target Status field of the Management Console.
Values: 0-1024
Default: 10
If you change the setting to 0, the notification will be disabled.
Changing this option will only affect how the status is changed on the
Target Status field of the
Management Console. To solve the underlying issue of why the operations are failing will require
investigation into the Storage Mirroring log files.
Program Setting Description