IBM Medium J11, Hardware Installation And Maintenance Manual

Page: 33 / 104

Table 5. Medium Disk Enclosure partially populated configuration (continued)
Disk count
Populated slots
41 0-23, 48-59, 96, 98, 100, 102, 104
53 0-23, 48-71, 96, 98, 100, 102, 104
Figure 12. The following highlights illustrate the slots to be populated in order from left to right as disks are
added for the four configurations noted in the above table.
Note: Note that even though there are more disk bays available, the J11 disk enclosure cannot be
populated to use more than 53 disks.
After adding additional disks to the enclosure, the available system capacity increases. If the disk
enclosure is part of a storage pool with multiple sets, the Manager interface may present the user with an
option to resize the storage pool to take advantage of the additional capacity. To make this resize
operation more efficient, this should not be done until all disk enclosures have been updated with new
disks to avoid the need to resize the pool multiple times. For more information, see the Resizing a storage
pool section in the Manager Administration Guide.
Partially populated Large Disk Enclosure (J12) disk drive slots
The IBM COS Large J12 Disk Enclosure provides support for up to 106 disk drive modules. It can be
partially populated to allow use with fewer than 106 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 Large J12 Disk Enclosure supports four different disk populations. The following table describes
those four configurations.
Chapter 3. System overview 13