IBM Partner Pavilion DS4100 manual Storage server components

the DS4000 storage expansion units attached to the DS4100 storage server should be plugged into the same two independent external power circuits as the DS4100. This ensures that the DS4100 storage server and all its attached storage expansion units will have power if only one power circuit is available. In addition, having all the right or all the left power supplies plug into the same power circuit enables the components in the storage subsystem to power on simultaneously during an unattended restoration of power. See Figure 56 on page 62 for an example of redundant power connections.

Note: This guideline cannot be followed for the DS4100 single-controller storage server, which does not offer redundant power supplies. However, you can use Uninterruptible Power Supply (UPS) units with the DS4100 single-controller storage server to provide protection against power brown-outs and short power outages.

vBefore any planned system shutdown or after any system additions, removals, or modifications (including logical drive creations, storage partitioning definitions, hardware changes, and so on), save the storage subsystem profile as explained in the DS4000 Storage Manager guide for your operating system. Save the profile in a location other than the logical drives created for the DS4100 storage server.

vEnsure that your system is in an optimal state before you shut it down. Never turn the power off if any fault light is lit; be sure to resolve any error conditions before you shut down the system.

vDuring any maintenance or attended power-up procedure, carefully follow the power-up sequence listed in “Turning on the storage server” on page 66. 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 “Turning on the storage server” on page 66 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 arrays are not displayed in the DS4000 Storage Manager graphical user interface (GUI).

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

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

Storage server components

The following sections show the components of the DS4100 storage server.

Hot-swappable devices enable you to maintain the availability of your system while you remove, install, or replace a hot-swap device. All DS4100 storage server models support hot-swap SATA hard disk drives and cooling fan CRUs, so you can remove and replace these components without turning off the storage server. In addition, the DS4100 base storage server supports hot-swap RAID controllers and power supplies.

Chapter 1. Introduction 7