On 5/29/07, Ray Mansell <[EMAIL PROTECTED]> wrote:
I would echo what David says, and would also add that, although you can share processors with LPAR, you can *not* share memory. Thus, the memory you (by definition) dedicate to your LPAR is no longer available to other LPARs.
Not only would you dedicate memory, you need to dedicate way more than when running on z/VM because in LPAR you cannot create the storage hierarchy we have with main memory and swap to VDISK.
So be aware that even though, as someone has already pointed out, you may well see a performance improvement, nothing is free, and something else on your system will suffer. If it is important for this particular Linux to have certain performance characteristics, then perhaps you could achieve that by using some of z/VM's performance knobs and dials instead?
Or you could see a performance degradation because you don't have MDC anymore, need to implement redundant network stuff or link aggregation yourself, need to go out of the box for traffic between servers, etc. One of the reasons PR/SM appears to have lower overhead is because it has less to do. Once you define a lot of LPARs you will find the overhead of PR/SM increase as well. With Linux on z/VM the emphasis is on overall throughput , scalability and efficiency. This is not the same as single server throughput. Rob -- Rob van der Heij Velocity Software, Inc http://velocitysoftware.com/ ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
