11 In-Service Field Maintenance For 5U Enclosures; Table 18 5U Enclosure Time Limits For Fru Replacement - Quantum QXS Series Hardware Installation And Maintenance Manual

11 In-service field maintenance for 5U enclosures
You may service the identified storage enclosure FRUs and still maintain continuous operation during the
replacement, but with two very important qualifiers:
You must determine whether your system allows for continuous operation during service replacement of
l
the storage enclosure drive modules in their carriers (DDICs) without interrupting access to enclosure file
systems.
You must complete the replacement in the allotted time, replacing only one FRU at a time. The storage
l
enclosure design provides for redundancy, so the loss of a single FRU does not impact functionality for a
limited time.
The tasks identified in this chapter first cover FRUs in the drawers, followed by FRUs accessible from the rear
panel area. It is essential you adhere to all safety precautions when servicing storage enclosure FRUs.
CAUTION When performing maintenance on the storage enclosure or its components:
Observe the caution label affixed to each drive module or FRU prior to handling or replacing it.
l
Do not remove a defective FRU until you have its functional replacement ready for insertion.
l
To adhere to safety precautions when replacing a FRU in a storage enclosure:
1. Replace any defective FRU with a fully operational one as soon as possible.
2. Replace any defective FRU within the identified replacement time to minimize air loss and maintain
optimum cooling within the storage enclosure.

Table 18 5U enclosure time limits for FRU replacement

Defective FRU
Drawers
Drive, LFF or SFF, in carrier (DDIC)
Rear panel area
Fan cooling module (FCM)
Power supply unit (PSU)
Controller module (CM)
Attachments
Rackmount rail kit
Cable kits: Standard HD mini-SAS to HD mini-SAS (SF-
8644)
AC power cord, compatible
3. Prevent electrostatic discharge from damaging the storage enclosure or its components.
a. Keep a static-protected work surface clear of clutter, including plastic, vinyl, and foam.
b. Transport and store FRUs in static-safe containers.
c. Keep FRUs in their containers until reaching a clear, static-protected work surface.
100 Chapter 11 In-service field maintenance for 5U enclosures
Replacement time limit
7 minutes, including drawer closure
7 minutes
7 minutes
7 minutes
N/A
N/A
N/A