Scaling Arrays Into High Capacity Configurations; Limitations - Sun Microsystems StorEdge3000 Series Manual

Scaling Arrays Into High Capacity
Configurations
Note – High capacity Sun StorEdge 3500 series configurations are supported, with
certain limitations. For example, only the sequential cache optimization mode can be
used. Other important limitations may exist. Consult the Sun StorEdge 3510 and
3511 FC array documentation for additional information. A Sun StorEdge 3510 FC
array with more than two expansion units is a high capacity configuration. A Sun
StorEdge 3511 SATA array with one expansion unit or more is a high capacity
configuration.
Carefully consider the limitations of these special high-capacity configurations.
Using multiple arrays connected to the same SAN normally provides significantly
better performance than one high-capacity configuration.

Limitations

Random optimization should not be used with high-capacity configurations. Use
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sequential optimization instead. Random cache optimization greatly reduces the
maximum number of supported disks.
Only the cabling configurations detailed in this section are supported when
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configuring high-capacity Sun StorEdge 3500 series arrays.
Maximize the size of each logical drive (up to
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drives) before creating another logical drive. Otherwise the maximum number of
eight logical drives might limit future expansion.
Limiting the maximum number of expansion units on a Sun StorEdge 3510 FC
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array to 7 provides much greater configuration flexibility. Doing so enables the
use of up to 96 disks.
If you stack a tabletop array and expansion units on top of each other, you can
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stack up to five physical units. Do not stack more than five physical units.
Many of these configurations require the use of optional extended-length cables,
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part number X9732A. Other items may also be required. Refer to the Sun StorEdge
3000 Family FRU Installation Guide for information about supported cables, SFPs,
and other user-replaceable items.
Best Practices for the Sun StorEdge 3510 and 3511 FC Arrays
Gbyte for RAID 5 logical
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