Connecting Storage Expansion Enclosures To The Ds5100 And Ds5300; Redundant Drive Channel Pair; Removing The Lc-Lc Fibre-Channel Cable From An Lc-Sc Fibre-Channel Cable Adapter - IBM DS5100 Installation, User's, And Maintenance Manual

Figure 34. Removing the LC-LC fibre-channel cable from an LC-SC fibre-channel cable
adapter
3. Replace the protective caps on the cable ends.

Connecting storage expansion enclosures to the DS5100 and DS5300

If the storage expansion enclosures that you want to install currently contain logical
drives or configured hot spares, and you want them to be part of the DS5100 and
DS5300 configuration, refer to the IBM System Storage DS4000/DS5000 Hard
Drive and Storage Expansion Enclosure Installation and Migration Guide. Improper
drive migration might cause loss of configuration and other storage subsystem
problems. Contact your IBM support representative for additional information.

Redundant drive channel pair

For the DS5100 and DS5300, each drive channel (see the Glossary definitions for
drive channels and drive loops) is associated with two ports, and there are four
drive channels and eight associated ports per controller. The total number of drives
per drive channel varies depending on the storage expansion enclosure. See
Table 17 on page 61. One channel from each controller combines to form a pair of
redundant drive channels.
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IBM System Storage DS5100 and DS5300 Storage Subsystem: Installation, User's, and Maintenance Guide
Attention
Before you power on the DS5100 and DS5300, the storage subsystem must
be cabled to at least one storage expansion enclosure populated with the
minimum number of drives for the storage expansion enclosure. Otherwise,
the DS5100 and DS5300 controllers do not successfully complete the
power-on process and operate optimally.
All drives in the connected storage expansion enclosure or enclosures must
contain no prior configuration data. Additionally, if at least two drives are not
installed in each EXP5000 attached storage expansion enclosure, the resulting
insufficient load to the storage expansion enclosure power supplies might
cause the drive expansion enclosure power supplies to intermittently appear
as failed and then reappear in an optimal state, falsely indicating that the
power supplies are bad. In addition, the EXP5060 storage expansion
enclosures require four drives per drawer (20 drives total) for optimal cooling
and power distribution.