Hitachi XP P9500 User Manual page 205

• sd or ssd devices (c3t0d0, c4t1d0)
When an HDLM device is created, the logical device file of the
corresponding sd or ssd device will be deleted. However, VxVM recognizes
the sd or ssd device as still existing even if the logical device file was
deleted.
• HDLM devices assumed by VxVM (c6t1d0)
Devices that VxVM virtually recognizes as HDLM devices. These devices
are not actually created.
Only one HDLM device is created for one LU
recognizes the same number of HDLM devices as the number of physical
paths.
#
For logical device files of HDLM devices, the number of such files to be
created is the same as the number of slices for one LU.
Figure 3-23 Devices Recognized by VxVM after Removal of Devices from
VxVM on page 3-141
removal of the non-HDLM devices from VxVM.
Figure 3-23 Devices Recognized by VxVM after Removal of Devices from
Only HDLM devices (c5t0d0) that are actually created are recognized. In this
case, HDLM functions, such as load balancing and failover, work normally.
Note
After VxVM is installed, if the vxdiskadm utility has not been used to
suppress a device or DMP from VxVM, the settings files such as /etc/vx/
vxvm.exclude may be absent. If these settings files do not exist, you
may be unable to suppress devices correctly.
Creating an HDLM Environment
Hitachi Dynamic Link Manager User Guide (for Solaris(R))
shows the devices that are recognized by VxVM after
VxVM
#
. However, for one LU, VxVM
3-141