Table 8. Connecting storage enclosures at the end (bottom) of a SAS drive cable loop
scheme in a DCS3700 and DCS3860 storage subsystems with Gen2 controllers
configuration
Step
Storage subsystem
Drive expansion 2
Drive expansion 3
Controller
A
Controller
B
top ESM
bottom
ESM
top ESM
bottom
ESM
OUT
IN
Drive port
x
(IN)
IN
IN
OUT
Returning the drive/loop channel to optimal state
To return the drive loop/channel to optimal state, complete the following steps:
1.
Reseat the cable.
2.
Use a new cable.
3.
Check the new storage enclosure compatibility with the existing storage
enclosures.
4.
Check for any special cabling requirements.
5.
Perform any additional suggestions as indicated by the Recovery Guru function
in the Storage Subsystem Management window.
6.
If necessary, contact your IBM marketing representative or authorized reseller
for assistance.
7.
If the problem remains, contact IBM support for assistance.
Storage subsystem SAS drive channel/loop schemes for
enclosures in a DCS3700 configuration
The DCS3700 storage subsystem with Gen2 controllers supports up to two
DCS3700 storage enclosures per physical expansion port, so multiple DCS3700
storage enclosures can be connected by chaining them together.
The following illustration shows the supported cabling configuration to connect a
DCS3700 storage subsystem with Gen2 controllers to the storage enclosures, and
between the storage enclosures with SAS drive channels.
Chapter 3. Adding or migrating storage enclosures
33
Summary of Contents for System Storage DCS Series
Page 89: ......
