DCSS as SWAP disk for z/Linux

[James G. Stracka]

I was reading a document that suggested using DCSS as the SWAP disk for z/LINUX
guests instead of V-DISK. This sounded interesting for several reasons.
Unfortunately, the document did not describe how to implement this.

Has anyone done this or experimented with it?

My guess would be that this DCSS would have to be defined Exclusive Write.

Can the DCSS be inside the guest's Virtual Storage or must it be outside?

How would this be formatted? And, how would it be "mounted"?

Jim

[Adam Thornton]

Post by James G. Stracka
I was reading a document that suggested using DCSS as the SWAP disk for z/LINUX
guests instead of V-DISK. This sounded interesting for several reasons.
Unfortunately, the document did not describe how to implement this.
Has anyone done this or experimented with it?
My guess would be that this DCSS would have to be defined Exclusive Write.
Can the DCSS be inside the guest's Virtual Storage or must it be outside?
How would this be formatted? And, how would it be "mounted"?

I haven't done it with the newer DCSS stuff, but the old way is
something like:

Yes, it's EW. It's inside the guest's storage but outside Linux's
(like with DCSS filesystems, you IPL the guest with "mem=128M" or
whatever to restrict Linux to below where you have the DCSS. Format
it with mkswap, and then swapon /dev/cssblk/whatever.

I think.

This is all from hazy memory. I haven't played with this in a year
or more.

Adam