HP StorageWorks B-Series Remote Replication Solution Best Practices Guide (5697-6731, June 2007)
Solution compon
ents requirements and considerations
This section hi
ghlights information to consider when building the data replication solution.
HP StorageWorks 400 Multi-Protocol Router/MP Router blade
• Use the MP Router blade, if there are available slots in the HP StorageWorks 4/256 SAN
Director; otherwise, use the standalone 400 Multi-Protocol Router. See the HP StorageWorks SAN
Design reference guide at h
ttp://www.hp.com/go /sandesignguide for additional information on
the 400 MP Router and MP Router Blade fabric rules.
• A minimum of two routers (standalone or blade) that communicate with the FCIP protocol must
be installed at each s ite for path redundancy over the WAN.
• 400 MP Router/MP Router blade installed for use with Continuous Access EVA must have the
exchange-based routing feature disabled. Follow the steps below to disable exchanged-based
routing default setting:
1. Open a telnet session.
2. Enter aptpolicy.
Current Policy: 3
3: Default Policy
1: Po r t B as e d R o u t i ng Pol i cy
3: Exchange Based Routing Policy
3. Enter switchdisable.
4. Enter aptpolicy 1.
Policy updated successfully.
5. Enter switchenable .
6. Enter aptpolicy.
Current Policy: 1
• The 400 MP Router or MP Router blade must NOT be con figured for FastWrite acceleration.
• In-order delivery (IOD) of frames during a fabric topology change should be enabled (default).
To verify the setting, enter iod show. If IOD is not set, enter iodset.
• Dynamic Load Sharing (DLS) must be disabled. Use dlsreset to disable DLS. Enter dlsshow
to verify the setting.
HP B-Series SAN infrastructure (switches/directors)
• The defa
ult routing policy for B-Series switches is set to “Exchange Based Routing Policy”. Change
the rout
ing policy to “Port Based Routing Policy” for all switches on the SAN used by Continuous
Access
EVA for replication traffic. Use the following command: aptpolicy 1. (See the
exampl
eunderHP StorageWorks 400 M ulti-Protocol Router/MP Router blade)
• Dynamic Load Sharing (DLS) must be disabled for all switches on the SAN used by Continuous
Access EVA for replication traffic. Use dlsreset to disable DLS.
• In-order delivery of frames during a fabric topology change should be enabled (default).
HP StorageWorks 4x00/6x00/8x00 EVA family
• For enhanced asynchronous remote replication, both arrays must be runing XCS firmware v6.x. With
the enhanced asynchronous mode, Continuous Access EVA uses a buffer-to-disk implementation that
increases the support for long distance replication.
• Replication between all EVA family models (EVA3000/4x00/5000/6x00/8x00) is possible, but
enhanced asynchronous replication is available only on the EVA4x00/6x00/8x00 family arrays.
• For low bandwidth inter-site links, using separate EVA ports for host I/O and replication I/O i s
highly recommended.
B-Series remote replication solution
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