Rob,
thanks for the answer.
i thought it could be possible to lock the v-disk because the performact toolkit shows
"residend" "locked" and "dasd" page numbers on the vdisk display.
I already locked the pages of the linux guests because i found it was fighting for
the storage with the MDC. (i know i can limit the MDC too, but i decided to lock
the linux guest pages). this reduced paging from several hundred pages per second
to almost zero. there is only one linux guest in this vm system.
i am afraid that this fight for storage starts again when i use v-disk for linux swap (V-DISK vs MDC)
Whats the best practice for this? limit MDC size so there is enough "free" storage for the v-disk?
While i am on this: what is the recommendation for the linux swap size? same as linux storage size? half of
linux storage size?
Regards, Stefan
| Rob van der Heij <[EMAIL PROTECTED]>
Sent by: VM/ESA and z/VM Discussions <[email protected]> 02.02.2006 11:13
|
|
On 2/2/06, Stefan Raabe <[EMAIL PROTECTED]> wrote:
> Is it possible to lock the pages of a v-disk in storage?
I don't think so. The address space is owned by system. The virtual
machine gets to the contents only through virtiual I/O, not through
address space functions.
What are you trying to achieve by locking the pages? Is it for
performance reasons that you want to do this? If CP could, then it
would be a Bad Idea (TM) especially before z/VM 5.2.
If you want to be able to peek inside the vdisk, you could define the
VDISK in the directory entry of the virtual machine and link to it
from another virtual machine.
Rob
--
Rob van der Heij rvdheij @ gmail.com
Velocity Software, Inc
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