Sas Subsystem Configuration That Uses A Three-Way Split Backplane - IBM 8412-EAD Manual

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v Each SAS adapter can recognize only three of the disk drives and cannot function in dual storage I/O

adapter (IOA) or high availability (HA) RAID mode. One SAS adapter connects to D1, D2, and D3. The

other SAS adapter connects to D4, D5, and D6.

v The SAS adapters can be assigned to separate partitions for boot devices.

v This configuration supports disks without RAID (referred to as JBOD) or RAID drives. However, RAID

drives are limited to three drives and no write cache.

v RAID 10 with two drives is limited. A RAID 10 array with two drives is equivalent to RAID 1

(mirrored drives). A RAID 0 disk array with one drive is similar to JBOD support. A RAID 10 array

with one or three drives is not allowed.

v Solid-state drives (SSDs) and hard disk drives (HDDs) can be used, but they can never be mixed in the

same disk enclosure.

v SSD and HDD can both be present in a split backplane if each side of the split backplane has only SSD

or HDD.

Example: Two-way split backplane

This example shows a two-way split backplane configuration. Each embedded SAS adapter controls three

disk drives.

Figure 2. Disk bays controlled by each embedded SAS adapter in a two-way split backplane

The following table lists the details of the two-way split backplane configuration.

Table 3. Configuration details

Embedded SAS adapter

Embedded SAS adapter A

Embedded SAS adapter B