IBM DS8000 manual Planning

Tip: We recommend that you reserve all LSSs in address group 0 (LSSs 00-0F) for CKD ESCON attachments because ESCON attachments must use address group 0.

10.1.2 Summary of the DS Storage Manager logical configuration steps

It is our recommendation that you review the following concepts before performing the logical configuration. These recommendations are discussed in this chapter.

Planning

When configuring available space to be presented to the host, we suggest that you approach the configuration from the host and work up to the DDM (raw physical disk) level. This is just the opposite way that you would configure the raw DDMs into host volumes. Refer to Figure 10-7 on page 200 to understand the hierarchy in the virtualization layers in the DS8000.

1.Determine the number of hosts and type of hosts (zSeries or Open System) in the environment that will use external capacity.

2.Determine the amount of capacity needed for each host and for each data format type.

3.Determine the number and the size of logical volumes needed to fulfill the capacity requirements for zSeries and open system hosts.

4.Determine the number of rank types (FB or CKD) and the number of ranks per extent pool to be able to build the specific logical volumes. The recommendation is to have one rank per extent pool unless the LUN size requires you to spread the LUN on several ranks in an extent pool.

5.Determine the number of address groups that will be assigned for CKD LSSs and the number of address groups that will be assigned for FB LSSs, and reserve the corresponding address group. Note that address group 0 needs to be reserved for ESCON attachment.

Chapter 10. The DS Storage Manager - logical configuration 199