Host I/O; Dealing With Hardware Faults; Continuous Operation During Replacement; Firmware Updates - Dell EMC ME4 Series Owner's Manual

3 Click Rescan.
NOTE: The reordering enclosure IDs action only applies to dual-controller mode. If only one controller is available, due to either
single-controller configuration, or controller failure, a manual rescan will not reorder the drive enclosure IDs.

Host I/O

When troubleshooting disk drive and connectivity faults, stop I/O to the affected disk groups from all hosts as a data protection precaution.
As an additional data protection precaution, it is helpful to conduct regularly scheduled backups of your data. See
controller module.

Dealing with hardware faults

Ensure that you have obtained a replacement module of the same type before removing any faulty module.
CAUTION:
• If the enclosure system is powered up and you remove any module, replace it immediately. If the system is used with any modules
missing for more than a few seconds, the enclosure(s) can overheat, causing power failure and potential data loss. Such action can
invalidate the product warranty.
• Observe applicable/conventional ESD precautions when handling modules and components, as described in
Avoid contact with midplane components, module connectors, leads, pins, and exposed circuitry.

Continuous operation during replacement

Your hardware or software enclosure management application determines the capability for replacing a failed disk without the loss of
access to any file system on the enclosure. Enclosure access and use during this period is uninterrupted. If an enclosure is equipped with
redundant PCMs or PSU, sufficient power is provided to the system while the faulty module is replaced.
NOTE: ME4 Series Storage System enclosures support hot-plug replacement of redundant controller modules, power supplies,
and expansion modules. Hot-add replacement of expansion enclosures is also supported.

Firmware updates

After installing the hardware and powering on the storage system components for the first time, verify that the controller modules,
expansion modules, and disk drives are using the current firmware release. Periodically, ensure that the firmware versions used in the
enclosure modules are compatible.

Customer-replaceable units

NOTE: See SBB IOMs used in ME4 Series storage enclosures
form factors supported by ME4 Series Storage System.
Table 28. ME4 Series enclosure models
2.5" (SFF) 24-drive controller enclosures
Model
ME4024
ME4 Series: 4–port controller enclosure matrix - 2U
Description
Fibre Channel (16Gb/s)
1,3
SFP
for pictorial views of IOM CRUs used in the different enclosure
Form
2U24
Description
Fibre Channel (16Gb/s)
1,3
SFP
Troubleshooting and problem solving
Shutting down a
ESD precautions.
Form
2U12
47