TIA, The z10BC IFLs are about 50% faster that the z9BC IFL. So, you are already getting more CPU power. If you over assign IFLs to a guest, it may just cause spin locks preventing other guests from getting CPs that the first guests has been assigned but is not using. See if they really need the third IFL (i.e. are they running 100% on two IFL) before adding a third to their user directory entry.
Roger ________________________________ From: The IBM z/VM Operating System [mailto:[email protected]] On Behalf Of Harris, Nick J. Sent: Tuesday, January 05, 2010 10:32 AM To: [email protected] Subject: 2 to 3 IFLs Hello All, We are upgrading our z9BC to a z10BC and increasing the IFLs from two to three. I am planning on modifying the Linux guest definitions to utilize the third IFL. Are there any performance issues or problems adding a third IFL? I can't imagine this would do anything but help, I'm just checking. We are running z/VM 5.4 in support of Linux guests. TIA! Nick Harris Lead Systems Programmer, Information Systems [email protected] Texas Farm Bureau Insurance Companies P. O. Box 2689 Waco, TX. 76702-2689 Phone 254.751.2259 <http://www.txfb-ins.com/><http://www.txfb-ins.com> <http://www.txfb-ins.com>[cid:resize_txfb_logo15af1.jpg]<http://www.txfb-ins.com> CONFIDENTIALITY STATEMENT: The foregoing message (including attachments) is covered by the Electronic Communication Privacy Act, 18 U.S.C. sections 2510-2521, and is CONFIDENTIAL. If you believe that it has been sent to you in error, do not read it. If you are not the intended recipient, you are hereby notified that any retention, dissemination, distribution, or copying of this communication is strictly prohibited. Please reply to the sender that you have received the message in error, then delete it. Thank you. . <http://www.txfb-ins.com>
