IBM DS4700 manual Storage subsystem components

having all the right or all the left power cables plug into the same power circuit enables the DS4000 devices in the configuration to power on simultaneously during an unattended restoration of power.

Note: Do not overload the circuits that power your storage subsystem and storage expansion enclosures. Use additional pairs of ac power distribution units (PDUs) if necessary. Refer to Table 17 on page 26 for information on storage subsystem power requirements. Contact your IBM service representative for additional information if needed.

vBefore any planned system shutdown or after any system additions, removals, or modifications (including firmware updates, logical drive creations, storage partitioning definitions, hardware changes, and so on), complete the following tasks:

1.Save the storage subsystem profile

2.Save the storage subsystem configuration

Make sure that you save the files in a location other than in the logical drives that were created for the storage subsystem.

For more information on how to complete these tasks, check the DS4000 Storage Manager online help or the Storage Manager guide for your operating system.

vDuring any maintenance or attended power-up procedure, carefully follow the power-up sequence listed in “Powering on the storage subsystem” on page 119. Check that each component of the subsystem is powered-on in the proper order during this entire power-up procedure to ensure the controller will be able to optimally access all of your storage subsystems.

vThe storage subsystem supports simultaneous power-up to the system components; however, you should always follow the power-up sequence listed in “Powering on the storage subsystem” on page 119 during any attended power-up procedure.

vA storage system in an optimal state should recover automatically from an unexpected shutdown and unattended simultaneous restoration of power to system components. After power is restored, call IBM support if any of the following conditions occur:

–The storage subsystem logical drives and subsystems are not displayed in the DS4000 Storage Manager graphical user interface (GUI).

–The storage subsystem logical drives and subsystems do not come online.

–The storage subsystem logical drives and subsystems seem to be degraded.

Storage subsystem components

The storage subsystem has the following removable components. These components, called customer replaceable units (CRUs), are accessible from the front or back of the storage subsystem.

vUp to sixteen 2 or 4 Gbps fibre channel or SATA Enhanced Disk Drive Modules (E-DDMs)

vTwo RAID controllers

vTwo ac power supply and fan units (Models 70A, 70H, 72A, and 72H)

vTwo dc power supply and fan units (Models 70S, 70T, 72S, and 72T)

vTwo battery units

vSFP modules

vBezel

6IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide