Returning The Drive/Loop Channel To Optimal State; Storage Subsystem Sas Drive Channel/Loop Schemes For Enclosures In A Dcs3700 Configuration; Connecting Storage Enclosures At The End - IBM System Storage DCS Series Installation And Migration Manual

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
Controller
A
1 on page
31
4 on page
32
6 on page
32

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.
Drive expansion 2
Controller top ESM
B
OUT
Drive port
x
Chapter 3. Adding or migrating storage enclosures
Drive expansion 3
bottom top ESM
ESM
IN
(IN)
IN
bottom
ESM
IN
OUT
33