HP Insight Recovery 6.3 User Guide

assigned to DR Protected logical servers so that they do not automatically power up after an outage.
If, for example, the Primary Site loses power and site failover is invoked, the original Primary Site
will not resume running the DR Protected logical servers when power is restored. The managed
nodes (whether VC blades or virtual machines) assigned to DR Protected logical servers will stay
powered down until the site role is changed to Recovery (and resources are unassigned).
Target selection and parallelism of activation during a Change local site
to Primary Site operation
The Logical Server Management (LSM) component in HP Insight Dynamics supports the concept of
targets that are most suitable for activating a logical server based on various criteria, for example,
an application may need to run on VC hosted logical servers only, to meet a performance
requirement.
DR Protected logical servers that can run on both physical and virtual targets (cross technology
logical servers) will be placed on the target type specified as preferred in the site configuration (P
for physical or V for virtual), based on availability. If the preferred target type is not available, HP
Insight Recovery will ignore the target type preference and place cross technology logical servers
on available supported targets.
LSM allows logical servers to be activated in parallel, exploiting parallelism that is available in
the managed infrastructure. HP Insight Recovery exploits the parallelism of activation available
from LSM when performing a Change Role to Primary operation, to reduce failover time. Two user
accessible settings are available to influence HP Insight Recovery behavior in this area:
• If there are workloads that you want to bring up first during the failover process, the Recovery
Group Start Order values for the associated Recovery Groups can be set lower than the values
you set for workloads that can be brought up later in the failover process. HP Insight Recovery
will ensure that logical servers in a Recovery Group with a lower Recovery Group Start Order
value will be activated before logical servers in a Recovery Group with a higher Recovery
Group Start Order value are activated.
• Use the Recovery Group Power Up Delay parameter, if you want to ensure that the logical
servers in a Recovery Group boot in a staggered fashion during the failover process. The
Recovery Group Power Up Delay parameter sets a minimum delay between the time when
one logical server in the Recovery Group begins its boot process and the time when the next
logical server in the Recovery Group begins its boot process.
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