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50 Product Overview
Figure 19
RAID 5DP Data Storage Example
Data Availability and AutoRAID
When configured in the AutoRAID mode, the Virtual Array uses a combination
of RAID 1+0 and RAID 5DP. As a result, the disks within a single RG can have
a portion of its data capacity used as RAID 1+0, while the other portion is
used as RAID 5DP.
During disk failures, rebuild is directed to rebuild the most statistically
vulnerable data first. After the first disk failure in an RG, the rebuild process
prioritizes RAID 1+0 data first. If a second disk fails before the rebuild
completes, then RAID 5DP is prioritized first. This logic represents the statistical
availability model for the two failure states. Once the RAID 1+0 data has
been rebuilt, the RAID group is protected against any two simultaneous disk
failures. The status of a RAID 1+0 data rebuild can be displayed using
Command View.
AutoRAID and Dynamic Data Migration
Unlike conventional disk array, the virtual array has the option to self manage
the RAID level selection based on the workload characteristics. In this mode,
the array controller attempts to place data in the RAID level that provides the
best performance based on how the host accesses that data. This RAID level
selection is both automatic and dynamic. Dynamic Data Migration is a
background operation, and gives priority to host operations. It is possible that
Summary of Contents for StorageWorks 7110 - Virtual Array
Page 12: ...12 Contents ...
Page 54: ...54 Product Overview Figure 21 VA 7110 I O Architecture ...
Page 90: ...90 Troubleshooting ...
Page 116: ...116 Servicing Upgrading Figure 45 Removing Installing an Array Controller Filler Panel 1 2 3 ...
Page 129: ...Servicing Upgrading 129 Servicing Upgrading Figure 52 Removing and Installing an LCC 1 2 3 ...
Page 130: ...130 Servicing Upgrading Figure 53 Setting the FC Loop Speed Switch Must be set to 1GB s ...
Page 149: ...Specifications Regulatory Statements 149 Specifications Regulatory Statements ...
Page 151: ...Specifications Regulatory Statements 151 Specifications Regulatory Statements ...
Page 152: ...152 Specifications Regulatory Statements ...
Page 164: ...164 Index ...