Each of the attached SAN Volume Controller LUNs
has a special device file in the Linux® directory
/dev.
Hosts that use Linux 2.4
kernel operating systems have 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.
Hosts that use Linux 2.6
kernel operating systems can have as many fibre-channel disks as the
number allowed by the SAN Volume Controller.
The following Web site provides the most current information about
maximum configuration for the SAN Volume Controller:
www.ibm.com/storage/support/2145
The range of devices for each type of kernel is detailed below:
- Device range without a subsystem
device driver (SDD)
- /dev/sda to /dev/sddx
- Device range with an SDD
- Linux 2.4 kernel operating
systems have the following range:
- /dev/vpatha, vpathb...vpathp
- /dev/vpathaa, vpathab...vpathap
- /dev/vpathba, vpathbb...vpathbp...
- /dev/vpathza, vpathzb...vpathzp
- /dev/vpathaaa, vpathaab...vpathaap...
- Linux 2.6 kernel operating
systems have the following range:
- /dev/vpatha, vpathb...vpathz
- /dev/vpathaa, vpathab...vpathaz
- /dev/vpathba, vpathbb...vpathbz...
- /dev/vpathza, vpathzb...vpathzz
- /dev/vpathaaa, vpathaab...vpathaaz...
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