#DISKLIBRARY SOFTWARE#
Although the backend disk storage in the SAN can reside on the same disk array, it should be configured in the Commvault ® software as two separate libraries where Logical unit numbers (LUNs) are presented as mount paths in dedicated libraries for specific MediaAgents. When using SAN storage, each building block should use a dedicated MediaAgent, DDB and disk library. In this case, the zoned storage is presented directly to the MediaAgent providing Read / Write access to the disks.
SAN storage can be zoned and presented to MediaAgents using either Fibre Chanel or iSCSI. Storage Area Networks or SANs are very common in many data centers.
The following explanations assume Commvault deduplication is being used.
From the CommCell ® console, validate the mount path speed and document for future reference. If additional mount paths are added later, the streams will spill as expected. Set mount path usage to Spill and Fill, even if using only one mount path. For instance, if there are 10 mount paths, and there is a maintenance job, such as a defrag job running on one, the mount path can be set to read-only, leaving 90% of the disk library available for backup jobs. If using DAS or SAN, try to create multiple mount path. If using DAS or SAN, format mount paths using a 64KB block size. There are three methods that disk library data paths can be configured: Replicated folders are read-only and replication can be configured for use with third party replication hardware. Replicated – disk libraries are configured like a shared disk library with the exception that the Shared Disk Device has a replicated data path defined to a volume accessible via another MediaAgent. NFS shared disks appear to the MediaAgent as local drives. For UNIX hosted MediaAgents, Network File System (NFS) protocol can be used. CIFS protocol is used to manage multiple MediaAgent access to the same directory. One path to the shared folder can be direct while the others are Common Internet File System (CIFS) shared directory paths. A shared disk library can then be created and the 'Shared Disk Devices' added to the library. This enables other MediaAgents access to the same shared volume resource. Shared – disk libraries are libraries with more than one Primary Sharing Folder configured on a Shared Disk Device. The Shared Disk Device in a dedicated disk library has only one Primary Sharing Folder. Mount Paths are configured as Shared Disk Devices. One or more mount paths can be created/added to the library. Dedicated – disk libraries are created by first adding a disk library entity to the MediaAgent using either the right-click All Tasks menu or the Control Panel's Expert Storage Configuration tool. There are three primary types of disk libraries: 
Within each mount path, writers are allocated which defines the number of concurrent streams for the mount path. These paths are defined explicitly to the location of the storage as a drive letter or a UNC path. A disk library is a logical container which is used to define one or more paths to storage called mount paths.
0 kommentar(er)
