Medium Disk Enclosure Partially Populated Configuration - IBM Medium J11 Hardware Installation And Maintenance Manual

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 figure 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 configuration, use slots 0-23, 48-71, 96, 98,
100, 102, and 104, as highlighted in the figure above.
• When installing disks in a Large (J12) Disk Enclosure configuration, 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 fixed increments and
installed in specific 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 configurations.
Table 5. Medium Disk Enclosure partially populated configuration
Disk count
14
28
12 IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and
Maintenance Manual
Populated slots
0-11, 96, 98
0-23, 96, 98, 100, 102