HP 418800-B21 HP StorageWorks Replication Solutions Manager 4.0.1 user guide ( - Page 432

• In the process of normalizing or being deleted. See normalization. Disk groups Disk group is the term for a named pool of storage on a storage system in which virtual disks can be created. Seeonline and near-online disk group categories. IMPORTANT: Unless noted otherwise, the term disk group applies to storage system disk groups and not to host volume disk groups that are under the control of a host OS or logical volume manager. Storage system disk groups are managed through HP StorageWorks interfaces and not by logical volume managers. See also DR groups maximum log disk size. Cross Vraid replication Cross Vraid replication is a feature that allows the copy of a virtual disk to have a different redundancy level (Vraid) than the source disk. See virtual disk redundancy level. Implementation of cross Vraid is controller software dependent. See controller software features - local replication and controller software features - remote replication. Cross Vraid FAQ Can I use cross Vraid when locally or remotely copying any virtual disk? Generally, yes. However, the source virtual disk must be on a storage system that supports the feature. See controller software features - local replication and controller software features - remote replication. Why would I use cross Vraid? Typically, to create a copy that is smaller than the source virtual disk. For example, if you copy a disk whose redundancy level is Vraid 1 or Vraid 5 and use a cross Vraid assignment of Vraid0, the copy will be smaller. This more efficient use of space can be appropriate when the copy is retained only for a short time and is not intended to be a high availability resource. Disk groups A disk group is a named pool of disk space on a storage array in which individual virtual disks can be created. IMPORTANT: Unless noted otherwise in the help, the term disk group applies to storage array disk groups and not to host volume disk groups that are under the control of a host OS or logical volume manager. Online and near-online disk categories When a disk group is created using HP Command View EVA, it is assigned a disk category of online or near-online. Whenever a virtual disk is created, it assumes the disk category of its disk group. • Online disk category. The online disk category provides first tier performance and reliability. All physical disk drives in this category of disk group are dual ported, high performance fibre channel drives. • Near-online disk category. The near-online disk category provides second tier performance and reliability. All physical disk drives in this category of disk group are lower cost, hybrid fibre channel disk drives. Hybrid drives are dual ported, FATA (Fibre Attached Technology Adapted) drives. Typical uses and recommended category are as follows. 432 Virtual disks