HP StorageWorks Storage Mirroring scripting guide (T2558-96074, February 2008)

12 - 13
MaxRetry A generic, application wide setting specifying the number of retry attempts for processes such as
creating sockets, starting the service, and so on
Values: any integer
Default:
5
GUI Setting
: None
MaxWriteChunkSize Maximum merged op size (in bytes) used during replication
Values: 1 - 131072
Default: 65536
GUI Setting: None
MCHelpPath The path and file name to the Management Console online help file
Default: C:\Program Files\StorageWorks\Storage Mirroring\online help\mc\
wwhelp.htm
GUI Setting
: None
Do not change this value or the online help will not work.
MemoryAllocator
CallbackMode
Determines what action is taken when the MemoryQueueToDiskThreshold is met
Values:
0 Auto-disconnect—Auto-disconnect processing is initiated when the
MemoryQueueToDiskThreshold has been met. Connections will be reestablished
when auto-reconnect occurs.
1 Pause—The Storage Mirroring service stops pulling operations from the driver when the
MemoryQueue ToDiskThreshold has been met. The target will pause the source.
The service will resume pulling operations when the target tells the source to
resume.
2 Queue—The source and target begin queuing operations to disk.
Default:
2
GUI Setting
: None
MemoryQueueToDisk
Threshold
A percentage of
QmemoryBufferMax that will trigger queuing to disk.
Values: any valid percentage
Default: 100
GUI Setting: None
MinCompressionFile
Size
The minimum file size, in bytes, that will be compressed. Files smaller than this size will not be
compressed.
Values: any file file size
Default: 1024
GUI Setting: None
MirrorChunkSize Block size, in bytes, used in the mirroring process
Values: 1 - 1048576
Default:
32768
GUI Setting: Server Properties, Source tab, Mirror Queue, Size of Mirror Packets
A higher block size value gives you better throughput, but only to a certain point, then it starts
using more memory (this has to do with the way memory is allocated and deallocated). A lower
block size value produces slower throughput, but uses memory efficiently. The optimal value is
32768.
MirrorEncryptedFiles Specifies if Windows 200x encrypted files are mirrored
Values:
0 Encrypted files are not mirrored
1 Encrypted files are mirrored
Default:
1
GUI Setting
: None
Server Setting Description