IBM SAS RAID controllers, Manual

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2. Install the SAS storage adapters on the system or partition. For instructions, see the following PCI
adapters topic collections, as applicable to your system type and model:
v
PCI adapters for the 8202-E4B, 8202-E4C, 8202-E4D, 8205-E6B, 8205-E6C, or 8205-E6D systems
v
PCI adapters for the 8231-E2B, 8231-E1C, 8231-E1D, 8231-E2C, 8231-E2D, or 8268-E1D systems
v
PCI adapters for the 8233-E8B or 8236-E8C systems
v
PCI adapters for the 8248-L4T, 8408-E8D, or 9109-RMD systems
v
PCI adapters for the 8412-EAD, 9117-MMB, 9117-MMC, 9117-MMD, 9179-MHB, 9179-MHC, or
9179-MHD systems
Note: Do not attach any cables to the SAS storage adapters.
3.
To prevent errors while connecting the cables, perform a normal shutdown of the system or partition
before you attach the cables.
4. Attach the necessary SAS cables from the shared disk enclosure to the same SAS connector on each
storage adapter. For examples on how to cable the Dual storage IOA configurations, see “SAS cabling
considerations” on page 27.
5. Power on your system or partition.
6. Verify that the cabling and functioning of the storage adapters are correct by using the Dual Storage
IOA configuration screen, see “Viewing dual storage IOA attributes” on page 25.
7. Best performance is achieved when dual storage IOA access characteristics for each disk array are
such that the workload is balanced between the two storage adapters. See “Dual storage IOA access
optimization” on page 28 and create or change the RAID configuration as necessary.
Related concepts
:
“SAS cabling considerations” on page 27
Cabling your system correctly is one of the most important aspects of planning for a dual storage I/O
adapter (IOA) configuration. For RAID configurations that have disk expansion drawers, correct cabling
is required to provide redundancy between each adapter and the disk expansion drawer.
“Dual storage IOA access optimization” on page 28
View the active or passive path of your disk units and controller.
Related tasks :
“Viewing dual storage IOA attributes” on page 25
This topic collection provides the details for using the Auxiliary Storage Hardware Resource Detail
display to obtain dual storage I/O adapter (IOA) configuration information.
Related information
:
Installing PCI adapters
SAS RAID controller maintenance
Ensure optimal performance of your controller by using these maintenance procedures.
To help avoid controller and disk array problems, use the following tips:
v Perform a normal system shutdown before physically replacing or moving the RAID controller or
members of disk arrays. A normal shutdown of the system flushes the controller's write cache and
remove dependencies between the controller and the disks. Powering off the PCI slot using concurrent
maintenance options in Hardware Service Manager (HSM) has the same effect as it would on a single
controller when the Power Down System (PWRDWNSYS) command is used.
Note: Disks that are failed members of an unprotected (exposed) disk array can be replaced and the
disk unit data rebuilt while the system continues to run. No system shutdown is required.
v
You can physically move disks from one controller to another. However, if the disks are members of a
disk array, be sure to move all the disks in the array as a group. Before attempting a disk movement,
SAS RAID controllers for IBM i
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