The Virtualization Cookbook for SLES 10 SP2 - z/VM - IBM

Partition number (1-4): 1
First cylinder (1-8192, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-8192, default 8192):
Using default value 8192
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
► Create an ext4 file system with the mkfs.ext4 command:
# mkfs.ext4 /dev/sda1
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
...
► You should now be able to mount it and see the size:
# mount /dev/sda1 /mnt
# df -h /mnt
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 7.9G 146M 7.4G 2% /mnt
► Create a test file:
# echo “this is the file foo” > /mnt/foo
# umount /mnt
13.4.2 Configuring multipath
It is a best practice to set up multipathing for better availability. Perform the following steps:
► Create a second WWPN
# cd /sys/bus/ccw/drivers/zfcp/0.0.010a
# ls
availability cutype driver online subsystem
cmb_enable devtype modalias power uevent
# echo 1 > online
► Note the second WWPN. In this example it is 0x500507630503c73d:
# ls
0x500507630503c73d devtype in_recovery peer_wwnn status
availability driver lic_version peer_wwpn subsystem
card_version failed modalias port_remove uevent
cmb_enable hardware_version online port_rescan
cutype host2 peer_d_id power
# cd 0x500507630503c73d
► Echo the same LUN into the file unit_add This will enable the same LUN, but from a
different WWPN.
# cd /sys/bus/ccw/drivers/zfcp/0.0.010a
# ls
0x500507630513c73d devtype in_recovery peer_wwnn status
availability driver lic_version peer_wwpn subsystem
card_version failed modalias port_remove uevent
cmb_enable hardware_version online port_rescan
cutype host1 peer_d_id power
# cd 0x500507630513c73d/
Chapter 13. Miscellaneous recipes 203