Removing The 175 Mb Cache Raid - Dual Ioa Enablement Card From The 8248-L4T, 8408-E8D, Or 9109-Rmd - IBM Power Systems Series Manual

Removing the 175 MB Cache RAID – Dual IOA Enablement
card from the 8248-L4T, 8408-E8D, or 9109-RMD
Learn how to remove an 175 MB Cache RAID – Dual IOA Enablement card from the 8248-L4T, 8408-E8D,
or 9109-RMD system.
This feature is used to enable write cache on the two embedded SAS RAID controllers of the disk or
media backplane by providing the necessary rechargeable batteries for memory backup. It also enables
the two embedded SAS RAID controllers to work as dual storage IOAs, that is, high availability (HA)
RAID mode. This feature plugs in to the disk or media backplane and enables a 175 MB write cache on
each of the two embedded RAID controllers by providing two rechargeable batteries with associated
charger circuitry. The write cache can provide additional I/O performance for attached disk or solid-state
drives, particularly for RAID 5 and RAID 6. The write cache contents are mirrored for redundancy
between the two RAID adapters resulting in an effective write cache size of 175 MB. The batteries
provide power to maintain both copies of write-cache information in the event power is lost.
To remove 175 MB Cache RAID – Dual IOA Enablement card, complete the following steps:
1. Perform prerequisite tasks. For instructions, see "Before you begin" on page 21.
2. Begin with the power on.
Note:
To prevent data loss, both cache battery packs must be in an error state before the 175 MB Cache
RAID – Dual IOA Enablement card is removed from the system.
If you have powered the system off, power it on before you continue.
3. Select your operating system:
v AIX: Go to step 4.
v IBM i: Go to step 6 on page 4.
v Linux: Go to step 8 on page 4.
4. Force the cache battery pack into an error state on the AIX operating system (to prevent possible
data loss), as follows:
Attention: This step must be performed for both cache batteries; therefore, each of the embedded
SAS RAID controllers must be selected in the following steps:
a. Navigate to the IBM SAS Disk Array Manager by completing the following steps:
1) At the command prompt, type smit, and press Enter.
2) Select Devices.
3) Select Disk Array.
4) Select IBM SAS Disk Array.
5) Select IBM SAS Disk Array Manager from the menu that has options for configuring and
managing the IBM SAS RAID Controller.
b. Select Diagnostics and Recovery Options.
c. Select Controller Rechargeable Battery Maintenance.
d. Select Force Controller Rechargeable Battery Error.
e. Select the PCI Express x8 Planar 3 Gb SAS RAID Adapter for the battery you want to replace.
This option places the battery into the error state, which requires it to be replaced.
f. Repeat steps a - e for the other PCI Express x8 Planar 3 Gb SAS RAID Adapter in this same
system enclosure.
© Copyright IBM Corp. 2013
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