Using Dynamic Data Resiliency with Other DataCore Features
Most features are supported with multi-copy virtual disks. Exceptions from the usual behavior of 2-copy (mirrored) virtual disks are noted in the following sections.
Evacuate and Redistribute Operations
The Evacuate and Redistribute operations alter host access between storage sources in the 3-copy virtual disk to maintain high availability while performing maintenance procedures on a server. During these operations, the three storage sources remain associated with the virtual disk, only paths are adjusted for the new storage source. See Maintenance Mode (Evacuate/Redistribute) for more information.
Create Virtual Disk Wizard
The Create Virtual Disk wizard and virtual disk templates do not support 3-copy virtual disks. See Creating 3-Copy Virtual Disks for instructions.
Move Operation
The Move operation cannot be performed on the inactive storage source, (the storage source with host access disabled) but it can be replaced, see Replacing/Moving a Storage Source in a Virtual Disk. The inactive storage source in a 3-copy virtual disk also cannot be moved using the evacuate or redistribute operation, see Maintenance Mode.
Replication
When creating a replication, the server for the destination virtual disk cannot be the inactive storage source in a 3-copy virtual disk since host access is disabled.
Mirror Recovery
The inactive storage source in a 3-copy virtual disk must be split and unserved in order to perform the purge operation when the source disk for the inactive storage source is affected.
The inactive storage source in a 3-copy virtual disk cannot be forced online. The inactive storage source will subsequently perform a full recovery after the active storage sources have been restored.
Mirror recovery of the inactive storage source in the 3-copy virtual disk is linked to an active storage source and cannot be paused.
VVOLs
Preferred Servers
When the Auto select option is selected as the Preferred Server setting for a host, the software will select one of the active storage sources as the preferred server and the selection can change. To ensure that a particular server is selected, it must be explicitly selected at the host level as a preferred server or as preferred paths at the virtual disk level.