Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 12)

Access Logix is required when the storage system is connected to two or more clusters, two or more
nonclustered systems, or a combination of both clustered and nonclustered systems.
MirrorView
(optional)
Automatically duplicates primary storage system data for a cluster or stand-alone system to a secondary
storage system in a campus environment. MirrorView implements synchronous mirroring, which ensures that
data is updated on both the primary and secondary storage systems at the same time. You can manage up to
100 mirrors per array or 50 mirrors if the Write Intent Log is initiated.
MirrorView is an optional software component that is installed on the storage processors as a nondisruptive
upgrade and is transparent to users and software applications. MirrorView can be used in conjunction with
SnapView and is managed from within Navisphere Manager.
SnapView
(optional)
Captures point-in-time images of a LUN and retains the image independently of subsequent changes to the
files. SnapView images can be used to make shared LUNs available to another system for backups, decision
support, or testing without affecting the contents of the source LUN.
SnapView captures LUN images in one of two formats:
Snapshot — A point-in-time image of the source LUN. Snapshots can be accessed by cluster nodes from
a different cluster or stand-alone systems as an additional mountable disk volume (or LUN) with
read/write access privileges. You can create up to 100 individual snapshots or up to eight snapshots of
the same source LUN. You can create up to 100 individual clones or up to eight clones of the same
source LUN.
Clone — A static image of the original source LUN. Clones can be used to restore corrupted LUNs and
migrate LUNs between RAID groups and SPs, allowing you to fine tune your RAID arrays.
NOTE: Each snapshot or clone must be accessed from a different host.
SnapView is an optional software component that is installed on the DPE or SPE storage processors as a
nondisruptive upgrade and is transparent to users and software applications. SnapView can be used in
conjunction with MirrorView and is managed from within Navisphere Manager.
SAN Copy
(optional)
Allows you to move data between Dell | EMC storage systems without using host processor cycles or LAN
bandwidth.
SAN Copy is an optional software component that is installed on the storage processors as a nondisruptive
upgrade and is transparent to users and software applications. SAN Copy can be used in conjunction with
SnapView or MirrorView and is managed from within Navisphere Manager.
Optional Cluster Configurations
Direct-attached cluster
SAN-attached cluster
The following sections provide detailed information and examples for these options.
Direct-Attached Cluster
In a direct-attached cluster configuration, both nodes of the cluster are directly attached to a single storage system. In this
configuration, the RAID controllers (or storage processors) on the storage systems are connected by cables directly to the
Fibre Channel HBAs in the cluster nodes.
NOTE: A direct-attached cluster configuration does not use a SAN.
Figure 1-1 shows a basic direct-attached, single cluster configuration for a NAS Fibre Channel cluster configuration.
Figure 1-1. Direct-Attached, Single Cluster Configuration