HP StorageWorks Storage Mirroring Scripting Guide (T2558-96327, April 2009)

15 - 17
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
MemoryQueueTo
DiskThreshold
A percentage of
QmemoryBufferMax that will trigger queuing to disk.
Values: any valid percentage
Default: 100
GUI Setting: None
MinCompression
FileSize
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: 65536
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.
MirrorEncrypted
Files
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
MirrorOverwrite Determines if the mirror process overwrites existing files
Values: 0 never overwrite
1 always overwrite
2 overwrite if older
Default:
1
GUI Setting: None
Server Setting Description