Compaq ProLiant 1000 User Guide: Online Storage Controller Recovery Option - Page 30

Dual-Channel Configuration Considerations, Knockout Panels

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3-2 Planning and Installing the Online Storage Controller CAUTION: SMART-2 Array Controllers use different disk geometries than standard SCSI adapters. Consequently, disks cannot be interchanged between SCSI adapters and SMART-2 Array Controllers without complete loss of data on the disk. Dual-Channel Configuration Considerations You may want to consider a dual-channel OSCRO configuration when you want mass storage controller redundancy for more than seven spindles of data. There are a few things you should consider when planning for a dual-channel OSCRO configuration or a multiple controller pair configuration that involves a dual-channel controller pair. They are: 1. When forming dual-channel controller pairs, both controllers must be dual-channel controllers. Do not attempt to use a single-channel controller, such as the SMART-2SL, in a dual-channel configuration. 2. You may need a knockout panel(s) (see Figure 3-6) on the back of the server where the External Wide SCSI connectors will be mounted. If the knockout panel has no slots, you can replace it with the knockout panel included in the Recovery Server Option /U kit. Newer ProLiant servers are equipped with knockout slots and thus do not require knockout panel installation Knockout Panels The number of possible controller pairs in your OSCRO implementation may be limited by the number of knockout panels or slots available on the server. Some older ProSignia servers have only one knockout panel with four slots. Such systems are limited to implementing two dual-channel OSCRO configurations. Some servers have integrated knockout slots rather than knockout panels. IMPORTANT: Some older ProSignia systems do not have any knockout panels and cannot be used in dual-channel OSCRO implementations.

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3-2
Planning and Installing the Online Storage Controller
CAUTION:
SMART-2 Array Controllers use different disk geometries than
standard SCSI adapters. Consequently, disks cannot be interchanged
between SCSI adapters and SMART-2 Array Controllers without complete
loss of data on the disk.
Dual-Channel Configuration Considerations
You may want to consider a dual-channel OSCRO configuration when you
want mass storage controller redundancy for more than seven spindles of data.
There are a few things you should consider when planning for a dual-channel
OSCRO configuration or a multiple controller pair configuration that involves a
dual-channel controller pair. They are:
1.
When forming dual-channel controller pairs, both controllers must be
dual-channel controllers. Do not attempt to use a single-channel
controller, such as the SMART-2SL, in a dual-channel configuration.
2.
You may need a knockout panel(s) (see Figure 3-6) on the back of the
server where the External Wide SCSI connectors will be mounted. If the
knockout panel has no slots, you can replace it with the knockout panel
included in the Recovery Server Option /U kit. Newer ProLiant servers
are equipped with knockout slots and thus do not require knockout panel
installation
Knockout Panels
The number of possible controller pairs in your OSCRO implementation may
be limited by the number of knockout panels or slots available on the server.
Some older ProSignia servers have only one knockout panel with four slots.
Such systems are limited to implementing two dual-channel OSCRO
configurations. Some servers have integrated knockout slots rather than
knockout panels.
IMPORTANT:
Some older ProSignia systems do not have any knockout
panels and cannot be used in dual-channel OSCRO implementations.