HP Application Recovery Manager software A.06.10 Administrator's guide (March 2008)

A Appendix
Alternate paths support
For systems with multiple host adapters and connections to a disk array, the alternate
paths solution performs dynamic load balancing and monitors each path to ensure
that I/O completes its transactions. If a path between a disk array and a server fails,
alternate path software automatically switches to an alternate path, removing the
failed path from I/O rotation without data loss. Switchover is transparent to
applications, so they continue unaffected.
NOTE:
On UNIX and with EVA integration, the alternate paths used to import the volume group
on the backup host should be limited to the maximum supported number of paths.
For information on which alternate paths solutions are supported by which ZDB
integration and array type, see supported matrices in the HP Application Recovery
Manager software product announcements, software notes, and references.
With the HP StorageWorks Disk Array XP, you can control AutoPath load balancing
using the OB2AUTOPATH_BALANCING_POLICY variable (by default, AutoPath Round
Robin load balancing policy is used). For more information, see
“ZDB omnirc variables” on page 106.
Cluster configurations
Application Recovery Manager integrations support:
• MC/ServiceGuard (HP-UX)
• Microsoft Cluster Server
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