Auxiliary-write cache IOA (FC 5580; CCIN 5708)
Learn about the specifications and installation notes for the auxiliary-write cache IOA adapter and the PCI-X Ultra4 RAID disk-controller adapters used with it.
Feature 5580 includes a 2780 Peripheral Component Interconnect-X (PCI-X) Ultra4 RAID disk-controller adapter, a CCIN 5708 auxiliary-write cache IOA adapter, and the required connection cable.
- A
- SCSI port used to attach the auxilary-write cache IOA to a supported disk-controller. See Installing the SCSI cable.
- B
- Unused SCSI port shown here with a cover over it.
A physical cable connection is required between the 5708 adapter and SCSI port 4 of a 2780 or 2757 adapter. Both the 5708 adapter and the disk-controller adapter it is connected to must be installed in the same physical system unit or expansion unit, and must be installed in the same partition.
The 5708 adapter has 757 MB of auxiliary maximum compressed write cache. The adapter mirrors the write cache of the disk-controller adapter that it is connected to. Protection of data is enhanced by having two copies of the write cache stored on separate adapters. If a failure occurs to the write cache of the disk-controller, the 5708 adapter provides a backup copy during the recovery of the failed IOA.
Considerations for installing or converting to feature 5580
Read the following questions in relation to your system:
- Are you converting from feature 2780 to feature 5580?
- Are you replacing any other existing storage adapters with features 5580?
- Is your server partitioned (LPAR)?
If the answer to any of these questions is yes, or you are unsure of the answers, contact your authorized service provider for planning and deployment services.
For planning information and examples of deployment for features 5580, see Planning for Disk Storage Availability with Cache Solutions
For details about slot priorities and placement rules, see the PCI adapter placement topic collection for your system.
5708 adapter specifications
Item | Description |
---|---|
Adapter FRU number | 39J0686 |
Battery FRU number | 97P4846 |
Cable FRU number | 39J1702 |
Cables | Specific Storage Adapter to Auxiliary Storage Adapter SCSI cable is necessary and is provided with each feature or conversion. |
I/O bus architecture | PCI 2.2 power/bus compliant |
Unit description |
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Operating system or partition requirements | Supported in the IBM® i operating systems or
partitions only, versions V5R2, V5R3, and later. If you are installing a new feature, ensure that you have the software that is required to support the new feature and that you determine whether there are any prerequisites for this feature and attaching devices. To check for the prerequisites, see IBM Prerequisite website . |
Maximum number | For the maximum adapters supported, see the PCI adapter placement topic collection for your system. |
Partition information |
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Related information |
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Installing the adapters
For instructions on how to install PCI adapters, see Installing the PCI adapters topic.
Return here for instruction on installing the SCSI cable.
Installing the SCSI cable
The disk controller adapter and the auxiliary-write cache adapter are connected by a SCSI cable.
To install the SCSI cable, do the following steps:
- Attach the SCSI cable to SCSI bus port 3 (fourth physical port)
of the disk controller adapter. See the following figure.
- Attach the cable to SCSI port A on the auxiliary-write cache adapter. See Figure 1.
- Attaching the cable to the disk controller reduces the number of SCSI buses that support disk drives from four to three.
- Reducing the number of SCSI buses might also reduce the number of disk drives supported by the disk controller, depending on the system unit or expansion drawer in which the disk controller is installed.
- No disk drives are driven by the auxiliary-write cache adapter. This adapter protects against extended outage caused by loss of write cache, but does not protect against a disk controller failure.