Enclosure variants

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Medium and Large Disk Enclosure variants are described.

The IBM COS Medium and Large Disk Enclosure is configured as an expansion enclosure, as shown in the table below. The enclosure supports 106 qualified disk drive modules installed via the top panel.
  • Hot-swappable expanders support 96 disks attached to four 24 hard disk drive base planes (12 disks x 8 rows)

    If an expander is removed for replacement, the 24 hard disk drive base plane will continue to operate while the high-availability card is replaced.

  • The 10 hard disk drive base plane PCBA supports 10 disks (2 disks x 5 rows).
Table 1. IBM COS Medium and Large Disk Enclosure variants
Description of configuration PSUs1 System fans2 IOMs3 IOM fans2 Disks HS expanders
12 Gb/s direct dock LFF 2 4 1 2 106 4
Enclosure location of CRU variant Rear Rear Rear Top Top Top
  • 1 Redundant PSUs must be compatible modules of the same type (both AC).
  • 2 For adequate cooling, four rear-panel system fans are required, and two IOM fans provide cooling for the IOMs (accessed via the top panel).
  • 3 Hot-swappable expanders support 12 disk drive slots per disk bay (8 bays total).