Hi Jim , Since I don't have any more info about your machine and your LPAR configuration ( CPU and Memory ) I could say that you could configure your servers like this .
1) Web Server : I am not sure about of the type of the pages that you have at your web server . But based on my previous experience you could set like this . 1 CPU , 1 GB RAM But you should take care about the Apache ( I suppose that you are using apache ) configuration regarding number of threads and number of user connection . Try to use Sysstat to monitor your processor and your processor queue ( if you get more than 3 process at queue per second maube a second processor is good ) . 2) App Server : Is that a JAVA based APP server ? If is the serve memory size will be related to JAVA HEAP maximum value . The minimum number of process that I would try was 2 virtual CPUs . In a JAVA based server the time dedicated to process system requests ( memory management in the most of the time ) can become a problem. At the same way use sysstat to monitor process queue . I would say that you could set your server with 4Gb to start but maybe 6Gb would be better . 3) DB Server : That is the monster of application . I would recommend that you stay with your 4 CPUs and decrease your memory to 8GB-12GB . And look at careful at IO performance either if you use SAN or ECKD devices don be affraid to use LVM stripe , that will help you a lot . And keep in mind that the logs, datas , backup should be in different filesystem and if better the device are set in different channel address . As already recommended you should try to get your own number , but keep in mind that less resources that you use better the performance that you woulf get . Best Regards , ==================================== Saulo Augusto SIlva [email protected] 2009/3/13 Jim Moling <[email protected]> > Wondering if anyone has some rules-of-thumb for sizing a z/Linux virtual > server for AIX-based workloads, specifically CPU & memory. > All I am looking for are rough guidelines that can be used as a starting > point to estimate resources for moving a workload from a mid-tier platform > (AIX) to a mainframe virtual Linux server. > For example, we have AIX Server based applications that use a 3-tier > architecture that consists of: > > 1) Web Server - 2 CPU, 2 GB RAM > 2) App Server - 4 CPU, 8 GB RAM > 3) DB Server - 4 CPU's, 16 GB RAM, 100 GB Storage > > I realize that it ultimately depends on just how busy a server is in order > to determine resource requirements with any degree of accuracy, and > explained as much to those that asked me about this, and being short of > any empirical data at this point, was hoping that others may have derived > some basic guidelines based on their experience. We're looking at > potentially moving hundreds of AIX servers onto mainframe-based Linux > servers, so trying to get a handle on just what that will mean in terms of > resources. I figure the disk-based requirements would be pretty much > Gig-for-Gig, but not sure how to factor AIX CPU's to z10 IFL's and the > scaling factors going from AIX RAM to central storage. I humbly ask for > any help towards getting a better handle on this, which would be greatly > appreciated. > > Thanks, Jim Moling > > ----------------------------------------- > This E-mail and its attachments (if any) are intended solely for > the use of the addressee(s) and may contain sensitive but > unclassified information. If you are not the intended recipient, > you are hereby notified that any disclosure, copying, distribution, > or use of the information contained herein (including any reliance > thereon) is strictly prohibited. If you have received this E-mail > in error, please notify the sender immediately and destroy the > E-mail and any attachments. > > ---------------------------------------------------------------------- > 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 > ---------------------------------------------------------------------- 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
