Each attached SAN Volume Controller LUN
has a special device file in the Linux® directory /dev.
There is a maximum of 128 fibre-channel disks that are based on
the major numbers that are available. The entries for all 128 devices
are added by the operating system automatically.
The range of devices are detailed below:
- Device range without a subsystem
device driver (SDD)
- /dev/sda (LUN 0) to /dev/sddx (LUN 127)
- Device range with an SDD
- /dev/vpatha, vpathb...vpathp (LUN 0) to /dev/vpathaa,
vpathab... vpathzp (LUN 127)
Figure 1 and
Figure 2 show examples
of the range for the devices.
Figure 1. Example of range of devices
for a host running the Linux operating
system when not using the SDD# ls –l /dev/sda
brw-rw---- 1 root disk 8, 0 Aug 24 2005 /dev/sda
Figure 2. Example of range of
devices for a host running the Linux operating
system when using the SDD# ls –l /dev/vpatha
brw-rw---- 1 root disk 8, 0 Aug 24 2005 /dev/vpatha