You can also use V-disk for swap. This doesn't use any allocated disk, but
puts your swap into virtual storage, which means into XSTORE and paging
DASD. It requires a little setup, but is much faster than Linux DASD
swapping.
The following example assumes you boot from the 292 disk (dasdb) and use the
293 disk (dasda) for swap. Your /boot/parmfile should reflect this.
In the VM Directory for the Linux server, add
MDISK 293 FB-512 V-DISK 250000 MR LINUX SWAP DASDA
Then in the Linux Server's PROFILE EXEC, you will have to add
queue '1'
queue 'LXSWAP'
'FORMAT 293 E ( BLK 4096'
if rc <> 0 then exit rc
queue '1'
'RESERVE LINUX SWAP E6'
if rc <> 0 then exit rc
'CP IPL 292 CLEAR'
Then you have to modify the /sbin/init.d/boot file as follows: (about line
150 in SuSE 2.2.16)
#cho "Activating swap-devices in /etc/fstab..."#wapon -a &> /dev/nullecho "Formatting
T-DISK swap partition"dasdfmt -b 4096 -y -f /dev/dasdaecho "Creating swap file
signature"mkswap /dev/dasda1echo "Activating swap partition"swapon /dev/dasda1
Then when you IPL CMS for the Linux server, it will create a CMS RESERVED
V-disk for Linux, and then boot the 292 disk. During the Linux boot, Linux
will format the 293 for Linux and create a swap partition on it and use it.
"Problems worthy of attack prove their worth by hitting back."
-Piet Hein, Journal of Irreproducible Results March, 1971
Gordon W. Wolfe, Ph.D
VM Technical SErvices, The Boeing Company, (425)865-5940
> ----------
> From: Post, Mark K
> Reply To: Linux on 390 Port
> Sent: Thursday, January 17, 2002 8:04 AM
> To: [EMAIL PROTECTED]
> Subject: Re: swap file alloc
>
> Jammie,
>
> You can create a swap file on one of those volumes. You won't need to
> allocate the entire volume. 48MB of storage is pretty tight. I don't
> know
> about the new SuSE install, but I ran into problems installing various
> versions of the Red Hat beta without enough RAM, even though I allocated a
> large swap partition. Hopefully that won't be an issue for you. Section
> 16.6.6 of the RedBook you cite talks about how to set up a swap file.
>
> Mark Post
>
> -----Original Message-----
> From: Hall, Jammie [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, January 17, 2002 10:40 AM
> To: [EMAIL PROTECTED]
> Subject: swap file alloc
>
>
> I am running the LPAR and I only have two DASD allocated for this test
> install 0187 & 0188. I read in an article that you could run without a
> swap file. Is this true? I have 48MB Memory allocated. I figure I'll run
> into problems. Can I allocate a partial drive to swap? I do not want to
> be forced to have a full 2GB allocated to swap. That is extreme I think.
> I'm install SuSE 7.3 and reading the SuSE install guide and SG24-6264-00
> they make me believe I have to allocate the full 2GB.
>
> By the way, dasdfmt still going strong.
>
> Thanks, j-me
>
>
