HP Hitachi Dynamic Link Manager Software - Manual (Page 36)

2. HDLM Functions
14
2.6 Logical Device Files for HDLM Devices
When you install HDLM, a logical device file to be used by HDLM will be created for
each LU on a per-Dev (slice) basis. Setting this logical device file name in an
application, such as volume management software, enables the application to access
an LU by using the HDLM function.
The logical device files existing before HDLM installation (the logical device files of
an sd or ssd) will be deleted.
The following explains the names and locations of the logical device files for HDLM
devices
Logical device file names for HDLM devices
The logical device file name of an HDLM device is a changed version of the
controller number of the logical device file name of the sd or ssd device. For
example, let us assume that an LU has two physical paths, and for one of the Dev
(slices) in that LU, the corresponding logical device file names of the sd or ssd
devices are
c2t1d1s0
and
c3t2d1s0
. In this case, when you install HDLM,
these logical device files will be deleted. Then, a logical device file that has a
different controller number, such as
c4t1d1s0
, is created for the HDLM device.
The following explains each part of the logical device file name format
c
U
t
X
d
Y
s
Z:
U
The controller number reserved by HDLM using a nexus driver
X
The target ID or WWN (World Wide Name) of the sd or ssd device that
corresponds to the HDLM device
Y
The LUN of the sd or ssd device that corresponds to the HDLM device
Z
The device slice number of the sd or ssd device that corresponds to the
HDLM device
Note
In Solaris 9 or Solaris 10, if EFI labels are set for LUs, the format of the
HDLM logical device file name, which represents the entire LU, will be
changed to the
c
U
t
X
d
Y format.
Locations of logical device files for HDLM devices