With expanded storage VM provides a multi-level paging structure. More frequently used pages would typically live in expanded storage so that they can be 'paged in' faster. Less frequently used pages will migrate to disk naturally. There should be a fair amount of doc on the VM web site that describes this in much more detail.
Allocating expanded storage to a Linux machine will 'dedicate' that storage to the Linux guest, it can not be used by anyone else. I would think that your current swap concept is the most preferred. On Thu, 2003-10-16 at 07:26, Daniel Jarboe wrote: > With our RH guests we use a 64MB vdisk as our highest priority swap > device, backed up by a 128MB swap minidisk "just in case". The LPAR is > currently configured without expanded storage, BUT this weekend we're > bringing some in with an IPL. > > I presume SuSE SLES 8 includes the xpram driver? I wonder if I should > consider XSTOR for my "backup" swap volume rather than minidisk. Since > it's coming from XSTOR, does it need to be initialized like VDISK does, > with something like the MKSWAP EXEC? > > Presumably if guests don't have XSTOR defined, z/VM will still use it > for something. The LPAR is being reconfigured with XSTOR based on > various recommendations... at the expense of some real storage (no > additional storage is being configured to the LPAR). z/VM is supposed > to be a better performer under this configuration? > > Thanks for any info, > ~ Daniel > > > With the xpram driver Linux can use expanded storage as > > another disk I/O > > device, typically for paging or anything that requires very fast > > access. You might be better off removing it and using VDISK for a > > paging device. > > > ----------------------------------------------------------------------- > > This message is the property of Time Inc. or its affiliates. It may be > legally privileged and/or confidential and is intended only for the use > of the addressee(s). No addressee should forward, print, copy, or > otherwise reproduce this message in any manner that would allow it to be > viewed by any individual not originally listed as a recipient. If the > reader of this message is not the intended recipient, you are hereby > notified that any unauthorized disclosure, dissemination, distribution, > copying or the taking of any action in reliance on the information > herein is strictly prohibited. If you have received this communication > in error, please immediately notify the sender and delete this message. > Thank you. -- Rich Smrcina Sr. Systems Engineer Sytek Services - A Division of DSG Milwaukee, WI rsmrcina at wi.rr.com rsmrcina at dsgroup.com Catch the WAVV! Stay for requirements and the free-for-all. Update your zSeries skills in 4 days for a very reasonable price. WAVV 2004 in Chattanooga, TN April 30-May 4, 2004 For details see http://www.wavv.org
