Sun Microsystems StorEdge 6320 System 1.0, Справочное и сервисное руководство

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Chapter 2 Hardware and Software Descriptions 2-3
Utilities are provided on the Storage Service Processor that enable users to
reconfigure the Sun StorEdge 6020 arrays to meet workload performance
requirements.
The following features are available on a Sun StorEdge 6320 system:
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Volume support – You can create up to 64 volumes (also called LUNs) from a
storage pool per storage array.
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LUN access control – This restricts host HBA access to the volumes.
The RAID levels supported on the Sun StorEdge 6320 system configurations are:
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RAID 0 – A volume that arranges data across one or more components. Striping
alternates equally-sized segments of data across two or more components,
forming one logical storage unit. These segments are interleaved round-robin, so
that the combined space is made alternately from each component, in effect,
shuffled like a deck of cards. Striping enables multiple controllers to access data
at the same time, which is also called parallel access. Parallel access can increase
I/O throughput because all disks in the volume are busy most of the time
servicing I/O requests.
■
RAID 1 – This version of RAID 1 is considered to be RAID 1+0. Each data block in
a RAID 1 volume is mirrored on two physical drives. If one of the mirrored pair
fails, the data from the other drive is used. Because the data is mirrored in a RAID
1 configuration, the volume has only half the capacity of the assigned drives. For
example, if you create a 4-drive RAID 1 volume with 36-Gbyte drives, the
resulting data capacity is 4 x 36 / 2 = 72 Gbytes.
■
RAID 5 – In a RAID 5 configuration, data is striped across the drives in the
volumes in segments, with parity information being striped across the drives, as
well. Because of this parity, if a single drive fails, data can be recovered from the
remaining drives. Two drive failures in the same storage pool cause all data to be
lost. A RAID 5 volume has the data capacity of all the drives in the logical unit,
less one. For example, a five-drive RAID 5 volume with 73-Gbyte drives has a
capacity of (5 - 1) x 73 = 292 Gbytes.
2.1.4 Ethernet Hub
The Sun StorEdge 6320 system uses an Ethernet hub as the backbone for the internal
service network. The allocation of Ethernet ports is as follows:
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One for the Storage Service Processor (per system)
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Two for each Sun StorEdge 6020 array partner group
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One for the Ethernet hub that is installed in the second Sun StorEdge Expansion
Cabinet in the Sun StorEdge 6320 or 6320 switchless systems (if the second
cabinet is used)