IBM TotalStorage DS5100, Инструкция по установке, использованию и обслуживанию

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Attention: Because the interconnect-battery unit provides electrical signal
connections between the controllers, removing the interconnect-battery unit
interrupts the communications between the controller units in the DS5100 and
DS5300, resulting in a loss of communication between controllers A and B. Data
access is limited to only controller A when the interconnect-battery unit is removed.
Controller B is in an offline state while controller A performs all controller operations.
To prevent any problems as a result of this condition, controller B must be placed
offline before you remove the interconnect-battery unit. See “Replacing the
interconnect-battery unit” on page 187 for more information. Failure to observe the
instructions and prerequisites described in “Replacing the interconnect-battery unit”
on page 187 might result in a loss of data access.
Figure 8 shows how the interconnect-battery unit slides into the front of the storage
subsystem. The levers securing the interconnect-battery units to the storage
subsystem are shown in the released position.
The interconnect-battery unit contains two battery packs that maintain power for up
to thirty minutes to allow the controller to flush all cache data to the USB flash
memory modules, which are installed on each controller. Each battery pack contains
sealed, rechargeable lithium ion batteries.
The battery chargers in the power supply and fan units perform a battery test when
the storage subsystem is started and on a regularly scheduled interval thereafter.
Data caching is suspended during periods when the controllers performed battery
tests.
The interconnect-battery unit is hot-swappable. You can remove the
interconnect-battery unit for servicing and then reinsert it while the DS5100 and
DS5300 continues to perform I/O operations.
Levers
in released
position
Interconnect-
battery unit
ds50017
Figure 8. Interconnect-battery unit
Chapter 1. Introduction
21