IBM System Storage DS3500 Introduction And Implementation Manual page 151

Draft Document for Review March 28, 2011 12:24 pm
Attention: You must always implement a SAN zoning configuration when connecting two
or more host bus adapters to a DS3500 storage subsystem through a SAN switched fabric
infrastructure. SAN zoning is mandatory when a SAN includes more than one operating
system type, or when both tape and disk devices are attached.
Because different applications and host operating systems can require different SAN zoning
configurations, the specific SAN zoning requirements for each host operating system are
described in the prerequisite sections of the host implementation chapters later in this book.
A step-by-step description of implementing a specific SAN zoning configuration is beyond the
scope of this book because the method to implement a SAN zoning configuration can differ
greatly between the various switch models supported with DS3500 storage subsystem.
Zone Types
A zone member can be specified using one of the following zone types:
Port Level Zone A type of zone containing members specified by switch ports (domain ID,
port number) only. Port level zoning is enforced by hardware in the switch.
WWPN Zone A type of zone containing members specified by device World Wide Port
Name (WWPN) only. WWPN zones are hardware enforced in the switch.
Mixed Zone A zone containing various members specified by WWPN and certain
members specified by switch port. Mixed zones are software enforced through the fabric
name server.
Zones can be hardware enforced or software enforced:
In a hardware-enforced zone, zone members can be specified by physical port number, or
by WWPN, but not within the same zone.
A software-enforced zone is created when a port member and WWPN members are in the
same zone.
Note: You do not normally need to explicitly specify a type of enforcement for a zone. The
type of zone enforcement (hardware or software) depends on the type of member it
contains (WWPNs or ports).
For more complete information regarding Storage Area Networks, see the following IBM
Redbooks publications:
Introduction to Storage Area Networks, SG24-5470
IBM SAN Survival Guide, SG24-6143
Zoning configuration
Zoning is configured using your switch management software. You can use WWPN zoning to
set up each zone so that it contains one server port, and whatever storage device ports that
host port requires access to. You do not need to create a separate zone for each
source/destination pair. Do not put disk and tape access in the same zone. Also avoid using
the same HBA for disk and tape access.
We cannot stress enough that you ensure that all zoning information is fully documented and
that the documentation is kept up to date. This information must be kept in a safe location for
reference, documentation, and planning purposes. If done correctly, the document can be
used to assist in diagnosing zoning problems.
Chapter 4. IBM System Storage DS3500 and EXP3500 Cabling
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