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5
Device Naming
5-7
PowerPath Administration on Solaris
Pseudo (emcpower) devices offer the following advantages:
◆ There is only one pseudo device name for each multipathed
logical device. (There are multiple native device names for each
multipathed logical device, which is harder to manage.)
◆ Pseudo device names are easier to manage because there is a
one-to-one relationship between pseudo device names and
logical volumes. (Native device names are based on HBA, target,
and device assignments as recognized at system startup.)
◆ Implementing PowerPath’s boot-time, boot-path failover feature
requires pseudo devices.
◆ Operations of Sun Microsystem’s Dynamic Reconfiguration (DR)
feature are transparent to applications using pseudo devices.
(With native devices, these operations are not transparent:
c
#
t
#
d
#
s
#
paths are removed, which can be disruptive to
applications using those paths.) Refer to Dynamic Reconfiguration
on page 5-12 for information on using DR to add and remove
HBAs in a PowerPath environment.