IBM TotalStorage DS4300 Turbo, Инструкция по установке, использованию и обслуживанию

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v When mixing different types of storage expansion enclosures in the same drive
channel pair, the Link Rate Setting must be set at 2 Gbps for each storage
expansion enclosure. IBM does not support different enclosure speed settings in
the same drive loop.
In addition to the previously outlined general rules, it is strongly recommended that
you observe the following rules when connecting storage expansion enclosures to
the storage subsystem:
v
Ensure that the enclosure ID of all enclosures in a DS4300 storage subsystem
configuration (including the DS4300 storage subsystem) is unique. Enclosure IDs
(sometimes known as tray IDs) consist of two digits (x10 and x1). In 14-drive
expansion enclosures, the enclosure ID must be set manually. In 16-drive
expansion enclosures, the enclosure ID is set automatically. Refer to the
Installation, User’s, and Maintenance Guide for your appropriate enclosure for
information on how to manually set the switches. If the enclosure IDs are not
unique, an error will be posted in the DS4300 subsystem Major Event Log (MEL)
and the ID conflict LED on the enclosure with same enclosure ID will be lit.
In addition, ensure that the single digit (x1) of the enclosure ID for every
enclosure (including the DS4300 storage subsystem) in a redundant drive loop
pair is unique. If you do not set the single digit of the enclosure IDs to be unique
among enclosures in a redundant drive loop pair, then drive loop errors might be
randomly posted in the DS4300 subsystem Major Event Log (MEL).
For example, with four enclosures attached to the DS4300, the correct enclosure
ID settings should be x1, x2, x3, and x4 (where x can be any digit that can be
set). Examples of incorrect settings would be 11 , 21 , 31 , and 41 or 12 , 22 , 32 , and
62 . These examples are incorrect because the x1 digits are the same in all
enclosure IDs (either 1 or 2 ).
Important: Changing enclosure IDs on 14-drive enclosures with the mechanical
enclosure ID switch requires the power cycle of the DS4300 subsystem and all
enclosures in the configuration to activate the new settings. Changing the
enclosure IDs on 16-drive enclosures (EXP810s) does not require the power
cycle of all enclosures and the DS4300 subsystem.
If the enclosure IDs in your DS4000 subsystem configuration are not currently set
to have unique single digit values for the enclosures in the same redundant drive
loop pair, make the changes to the enclosure IDs in the next maintenance
schedule. This will prevent unnecessary downtime when you add enclosures of
different type (especially EXP810s) to the existing enclosures in the redundant
drive loop pair.
v When mixing EXP810 and EXP710 enclosures in the same drive loop with
EXP100 enclosures, all of the EXP810s and EXP710s must be grouped together
with the EXP100 connected to either end of the EXP810/EXP710 drive
expansion enclosure group. The primary reason for this grouping is because the
controller firmware considers the EXP810s and EXP710s to be the same
enclosure type (switched disk expansion unit type which have an
ESM-embedded fibre channel loop switch) despite being different models. These
two enclosure models must be grouped together if they are contained within a
drive loop.
Note: When grouping the EXP810s and EXP710s together, you must cable all of
the EXP810s together, followed by all of the EXP710s or vice versa. Do
not randomly cable the EXP710s and EXP810s together in the drive loop.
Figure 37 on page 54 and Figure 38 on page 55 are examples of correctly
cabling the intermix of EXP100 with EXP810 and EXP710 enclosures. Figure 39
on page 56 and Figure 40 on page 57 are examples of incorrectly cabling the
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IBM TotalStorage DS4300 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide
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