Best practices is to NEVER use swap disk. Two virtual disks is best practice
and set an
alert on the 2nd one. why dedicate real disks to a function that you never
want to use?
Only makes your hardware vendor happy, doesn't help operations or performance.
Dave Jones wrote:
I believe that the "best practices" for running Linux as a guest of z/VM
is to define 2
swap disks: 1) a primary swap area defined as a v-disk (a ram disk), and
2) a secondary
swap disk defined on a real 3390 device. By monitoring Linux's use of
the secondary swap
area (on real disk), you can see if the amount of swap space defined is
appropriate.
A very handy way of creating and using a VM v-disk for Linux swap is to
use the SWAPGEN
EXEC. It can be found here:
http://www.sinenomine.net/products/vm/swapgen
Eatherly, John D [EQ] wrote:
I am not positive that it will work. But this is what was passed to
us for doing this.
Make Swap File Procedure and Activate: 1. There are three
different types of swap
files. (a.) Swap space on a ramdisk. (b.) Swap space on a
partition. (c.) Swap
file. 2. It is recommended that we use (c.) Swap file. IBM
RedBook "Linux for
S/390" chapter 10.3.4.3 has the procedure that I used. 3. Create
a directory for
the swap file. For example: "mkdir /vol1/swap" Create a swap file of
128 MB: "dd
if=/dev/zero of=/vol1/swap/swapfs1 bs=1M count=128" Set up as swap
area: "Mkswap -c
/vol1/swap/swapfs1" Adjust the access permissions of the file: "chmod 600
/vol1/swap/swapfs1" "chmod 700 /vol1/swap" documented in chapter 5
page 74 Activate
the swap file: "swapon /vol1/swap/swapfs1" Make an entry in /etc/fstab:
/vol1/swap/swapfs1 swap swap defaults
0 0
Thanks John Eatherly
-----Original Message----- From: Linux on 390 Port
[mailto:[EMAIL PROTECTED] On
Behalf Of Martin, Terry R. (CMS/CTR) (CTR) Sent: Wednesday, November
26, 2008 10:58 AM
To: [email protected] Subject: Add a swap file to a running
z/Linux guest
Hi,
Is there a way to add a SWAP file to a running z/Linux guest and have
that guest start
using the SWAP file while that guest is running?
I am running REDHAT 4.6.
Thank You,
Terry Martin
Lockheed Martin - Information Technology
z/OS & z/VM Systems - Performance and Tuning
Cell - 443 632-4191
Work - 410 786-0386
[EMAIL PROTECTED]
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--
DJ
V/Soft
z/VM and mainframe Linux expertise, training,
consulting, and software development
www.vsoft-software.com
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