Table 9 2U Enclosure Time Limits For Fru Replacement - Seagate Exos E 2U12 Series Hardware Installation And Maintenance Manual

9 In-service field maintenance for 2U enclosures
You may service the identified 2U 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 the 2U enclosure
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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 2U enclosure design
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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 2U enclosure FRUs.
CAUTION When performing maintenance on the expansion enclosure or its components:
Observe the caution label affixed to each drive module or FRU prior to handling or replacing it.
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Do not remove a defective FRU until you have its functional replacement ready for insertion.
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To adhere to safety precautions when replacing a FRU in 2U 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 2U enclosure.

Table 9 2U enclosure time limits for FRU replacement

Defective FRU
Front panel area
Drive, LFF or SFF, in carrier (DDIC)
Rear panel area
Power cooling module (PCM)
Input/output module (IOM)
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 2U 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.
d. Always wear a grounded ESD wrist strap that meets a minimum 1 megohm (± 10%) resistance standard and that is snug
against your skin.
e. Use heel straps, toe straps, or boot straps on both feet to ground to your conductive floor or dissipating floor mat or
use a portable field service kit with a grounded, static-dissipating work mat.
f. Use conductive field service tools.
Replacement time limit
5 minutes
5 minutes
5 minutes
N/A
N/A
N/A
Chapter 9 In-service field maintenance for 2U enclosures
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