Saturday, March 24, 2007

View vpath's ESS attributes

Use command lsvpcfg to find the vpath serial number.
# lsvp
# lsvpcfg vpathX
example output:
servername:/ $ lsvpcfg vpath1
vpath1 (Avail pv myvg) 00126549 = hdisk4 (Avail ) hdisk10 (Avail )

The serial number of the vpath equals the Shark LUN ID

Friday, March 2, 2007

How to add filebase swapspace on Linux

a) Login as the root user

b) Type following command to create 512MB swap file (1024 * 512MB = 524288 block size):
# dd if=/dev/zero of=/swapfile1 bs=1024 count=524288

c) Set up a Linux swap area:
# mkswap /swapfile1

d) Activate /swapfile1 swap space immediately:
# swapon /swapfile1

e) To activate /swapfile1 after Linux system reboot, add entry to /etc/fstab file. Open this file using text editor such as vi:
# vi /etc/fstab
Append following line:
/swapfile1 swap swap defaults 0 0

So next time Linux comes up after reboot, it enables the new swap file for you automatically.

g) How do I verify swap is activated or not?
Simply use free command:
$ free -m
$ swapon -s