Specifications

Storage and Adapter Configuration
Item Description
Hitachi HDS 9570V, 9970V and 9980V
Certified by SIOS Technology Corp. in a single
path configuration with QLogic 23xx adapters.
Use theqla2300driver, version 6.04 or later.
Note:SIOS Technology Corp. recommends the
use of only single controller (i.e. single loop)
configurations with these arrays, using a fibre
channel switch or hub. However, it is also
possible to configure a LifeKeeper cluster in
which each server is connected directly to a
separate controller or port on the Hitachi array,
without the use of a switch or hub, as long as
each server has only a single path to the
storage. It should be noted that LifeKeeper
behaves quite differently from its normal
behavior in a split-brain scenario using this
configuration. LifeKeeper normally performs a
failover of an active hierarchy in a split-brain
scenario causing the original primary node to
reboot as a result of the stolen SCSI
reservation. When the Hitachi arrays are
configured with the servers directly connected to
multiple controllers or ports, certain timing
peculiarities within the Hitachi arrays prevent
LifeKeeper from acquiring a SCSI reservation on
the backup node and the failover attempt fails,
leaving at least part of the hierarchy running on
the original primary node. For this reason, it is
important thatallLifeKeeper resources in such a
configuration have a direct line of dependencies
to one of the disk resources such that no
resources can be brought in-service if the disk
resources cannot be transferred. This is
particularly true of any IP resources in the
hierarchy.
92Configuration