Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide

4–4 Compaq StorageWorks Data Replication Manager HSG80 ACS Version 8.5P Operations Guide
Maximum of 2 members allowed per
Remote Copy Set (1 on initiator; 1 on target)
Composed of 1 initiator and one target unit
Target unit cannot reside on the same
controller pair as its initiator unit.
One controller pair required for initiator; one
controller pair required for target.
Controller replication conducted through
port 2 on each controller.
■ Link between initiator and target site is made
through Port 2
■ Both links must be up when configured
Maximum 64 connections Effective number of connections is 64 minus the 4
default remote copy connections.
It is not possible to run DILX on units used
by Remote Copy Sets.
Run DILX prior to creating the Remote Copy Set
configuration.
The LUN/unit at the initiator and target sites
must be identical.
Keep the unit number, RAID level, disk geometry
used, etc. the same to eliminate confusion and error
risk.
Controller-based partitions are not
supported within Remote Copy Sets.
Host software may be capable of partitioning units.
Unit at the initiator and target sites cannot
be transportable units.
Units cannot be moved to non-controller
configurations without potential data loss.
Cannot use FRUTIL on remote site while I/O
is in progress to target site.
Max_cached_transfer_size should be set to
one on Target units and to whatever is
optimal for the Initiator host applications.
Write-behind caching allows for the best remote
copy performance.
Log units must:
■ reside at the initiator site.
■ not be moved to the target site.
■ not be a partitioned unit.
■ have write-back cache disabled.
■ have access disabled.
■ must be re-created at target site after
failover.
■ must be a mirrorset.
Table 4–1 Restrictions (Continued)
Restriction Implication