DataKeeper for Windows All Documentation - SIOS

CHKDSKThis command, which is used to move a DataKeeper protected volume to another network location, onlysupports changing the endpoints of a mirrored volume that is configured on 3 nodes or fewer.Workaround:For configurations greater than three nodes, the mirrors must be deleted and recreated with the final endpointat the local site and use route adds to get the mirrors created and resynced before moving the server to thefinal location/address/DR site.CHKDSKDescriptionIf you must run CHKDSK on a volume that is being replicated by SteelEye DataKeeper, it is recommended thatyou PAUSE the mirror before initiating the CHKDSK. After running CHKDSK, CONTINUE the mirror. A partialresync occurs (updating those writes generated by the CHKDSK) and replication will continue.Note: The bitmap file (for non-shared volumes) is located on the C drive which is defined by BitmapBaseDiras the default location. Running CHKDSK on the C drive of the Source system will cause an error due to theactive bitmap file. Therefore, a switchover must be performed so that this Source becomes Target and thebitmap file becomes inactive. The CHKDSK can then be executed on this system as the new target (originalsource).DataKeeper Volume Resize RestrictionThe DataKeeper volume resize procedure should be performed on only one volume at a time.Directory for Bitmap Must Be Created Prior to RelocationDescriptionIf you choose to relocate the bitmap file from the default location (%EXTMIRRBASE%\Bitmaps), you mustfirst create the new directory before changing the location in the registry and rebooting the system.Intensive I-O with Synchronous ReplicationDescriptionDue to the nature of synchronous replication (blocking volume writes while waiting for a response from thetarget system), you may experience sluggish behavior with any applications that are writing to the mirroredvolume. The frequency of these events could be high depending on the ratio of "Volume I/O traffic" to "systemresource". It is recommended that you use asynchronous replication when continuous and intensive I/Otraffic is anticipated for the volume or when SteelEye DataKeeper is used on a low bandwidth network.DataKeeper for Windows Technical DocumentationPage 174