DataKeeper for Windows All Documentation - SIOS

WriteQueueHighWater * †WriteQueueHighWater * †Note: Do not change this value while the mirror is actively being resynced; you must pause themirror prior to changing this value.Locations:For New Mirrors:HKEY_LOCAL_MACHINE\SYSTEM\\Services\ExtMirr\Parameters\WriteQueueHighWaterANDFor Existing Mirrors:HKEY_LOCAL_MACHINE\SYSTEM\\Services\ExtMirr\Parameters\Volumes\{Volume GUID}\Targets\{Target IP}\WriteQueueHighWaterNote: If editing this entry under Parameters, all NEW mirrors created will inherit this value. If editing thisentry under Target, the value pertains to that one Target only. Any Target values override Parameter values.Name Type Default DataWriteQueueHighWater REG_DWORD 20000 (0x4e20)Specifies the high water mark of the asynchronous write queue. During intensive I/O traffic, if the queuelength reaches this value, the SteelEye DataKeeper driver momentarily pauses the mirror, drains the queueand automatically starts a partial resync. This value represents the number of write requests in the queue,not the number of bytes. After updating this registry value, execute the READREGISTRY command sothat DataKeeper immediately starts using the new value.Note: This value depends on the available memory in the system. You can monitor the mirroring behaviorusing the SteelEye DataKeeper Performance Monitor counters and set this value accordingly.DataKeeper for Windows Technical DocumentationPage 50