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Figure 11. Top panel module slot index diagram with J11 disk slots highlighted

Populating disk drive slots

The IBM COS Medium and Large Disk Enclosure does not ship with pre-installed disk drive modules.

When installing disk drive modules, be mindful of the slot numbering shown in the gure above. Follow

this rule when populating the Disk Enclosure with disks possessing 12 watts maximum drive power per

slot:

• All disks must have the same capacity.

• When adding disks, all disks must have the same capacity as those that are presently installed in the

enclosure.

• When rack-mounting a Disk Enclosure, install the disks after the enclosure is installed in the rack.

• When installing disks in a Medium (J11) Disk Enclosure conguration, use slots 0-23, 48-71, 96, 98,

100, 102, and 104, as highlighted in the gure above.

• When installing disks in a Large (J12) Disk Enclosure conguration, use all slots.

Partially populated Medium Disk Enclosure (J11) disk drive slots

The IBM COS Medium J11 Disk Enclosure provides support for up to 53 disk drive modules. It can be

partially populated to allow use with fewer than 53 disk drive modules. To ensure proper thermal and

vibrational characteristics are maintained, the disk population must be increased in xed increments and

installed in specic slot locations. These disks can be installed while the enclosure is in use, or when it is

powered down. When installing disks, but while the disk enclosure is powered on, no more than 14 disks

should be added at time. After adding these disks, the operator should ensure that these disks have been

successfully brought online prior to adding additional disks.

The Medium J11 Disk Enclosure supports four different disk populations. The following table describes

those four congurations.

Table 5. Medium Disk Enclosure partially populated

conguration

Disk count Populated slots

14 0-11, 96, 98

28 0-23, 96, 98, 100, 102

12 IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and

Maintenance Manual

IBM Medium J11 User Manual

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