Chapter 3. IBM System Storage DS3500 Storage System planning tasks 33
Draft Document for Review March 28, 2011 12:24 pm 7914DS3KPlanning_090710.fm
second zone from HBA port 2 of the host to controller A and Controller B through port 2 of the
controllers.
With this configuration if a single path has a fault another path can be used to access the
devices without the need of a controller failover function being done.
3.1.2 Zoning considerations for Enhanced Remote Mirroring
The Enhanced Remote Mirroring (ERM) can only be connected through a Fibre Channel (FC)
connection which must be dedicated for data replication between the subsystems. The ports
used for ERM cannot be used to send or receive I/Os from any host. These requirements are
addressed by defining SAN zoning. There must be two zones defined for the ERM network,
one for controller A and one for controller B. Zones defined must separate the host ports from
the storage system mirroring ports and also separate the mirroring ports between the
controllers.
When using ERM, you must create two additional zones:
The first zone contains the ERM source DS3500 controller A and ERM target DS3500
controller A.
The second zone contains the ERM source DS3500 controller B and ERM target DS3500
controller B.
ERM is detailed further in IBM Midrange System Storage Copy Services Guide, SG24-7822.
3.2 Planning for physical components
In this section, we review elements related to physical characteristics of an installation, such
as rack considerations, fiber cables, Fibre Channel adapters, and other elements related to
the structure of the storage system and disks, including enclosures, arrays, controller
ownership, segment size, storage partitioning, caching, hot spare drives, and Enhanced
Remote Mirroring.
3.2.1 Rack considerations
The DS3500 Storage System and possible expansions are mounted in rack enclosures.
General planning
Consider the following general planning guidelines. Determine:
The size of the floor area required by the equipment:
– Floor-load capacity
– Space needed for expansion
– Location of columns
The power and environmental requirements
Best practice: For MPIO driver solutions it is best to create separate zones for each HBA
port connection from the host to both controllers (one zone for HBA port 1 and one zone for
HBA port 2), which isolates each initiator (HBA port) from the other.
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