Sun Microsystems StorEdge 3000 Series, Инструкция по установке, эксплуатации и обслуживанию

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Chapter 4 Connecting Your Fibre Channel Array 4-19
Similarly, you can connect expansion units to other channels (which are separate
from channels 2 and 3) if you configure channels 0, 1, 4, or 5 as drive channels. For
details, refer to
“Configuring FC Channels as Host or Drive (Optional)” on
page 5-22 .
Caution – To avoid drive assignment conflicts, make sure that each connected array
and expansion unit uses a different loop ID, as described in the following section.
4.10.1 Scaling Beyond 36 Disks
Note –
High capacity Sun StorEdge 3510 FC array configurations with more than
two expansion enclosures are supported, with certain limitations. For example, only
the sequential cache optimization mode can be utilized in most situations. Other
important limitations may exist.
Sun StorEdge 3510 FC arrays typically allow the connection of up to two expansion
units to support a maximum of 36 disks. However, you can create larger
configurations that support as many as eight expansion units and up to 108 disks if
you use the guidelines in this section.
Carefully consider the limitations of these special high-capacity configurations.
Using multiple Sun StorEdge 3510 FC 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
sequential optimization instead. Random cache optimization greatly reduces the
maximum number of supported disks.
■
Only cabling configurations described in the Sun StorEdge 3000 Family Best
Practices Manual for the Sun StorEdge 3510 FC array are supported when
configuring high-capacity Sun StorEdge 3510 FC arrays.
■
Maximize the size of each logical drive (up to 2048 Gbyte) before creating another
logical drive. Otherwise the maximum number of eight logical drives might limit
future expansion.
■
Limiting the maximum number of expansion units to 7 provides much greater
configuration flexibility. Doing so enables using up to 96 disks.