>The problem was z/VM has a total 768m of central available. Really? That's so little - does someone want your POC to fail? Or was that an oversite? Verify: From a CLASS B privileged ID (try maint), issue Q STOR and Q XSTOR
>Does a Linux quest really require 768MB of Central? Depends on what it is running... WebSphere AppServer 6.1 - much more! Apache, way less! DB2 -- you might be OK there. How many VM paging volumes do you have? Issue Q ALLOC PAGE Keep %full < 50, prefereably 35 or so. Marcy Cortes "This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation." -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of O'Brien, David W. (NIH/CIT) [C] Sent: Thursday, March 20, 2008 11:12 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: [IBMVM] Performance problem Linux under Zvm The problem was z/VM has a total 768m of central available. The Linux guests (3 total) each had 768m of central allocated, therefore contention. The Linux guests are over allocated and are storage constrained with 768m of central. Understanding the Linux guests would be in contention with each other for this storage VM time sliced what it could for each guest, therefore the symptoms we experienced. My question to this group - Does a Linux quest really require 768MB of Central? Regards, Dave O'Brien ________________________________ From: Romanowski, John (OFT) [mailto:[EMAIL PROTECTED] Sent: Thu 3/20/2008 1:45 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: Performance problem Linux under Zvm If CP INDICATE QUEUES shows an En (like E3) in the 2nd column for one or more userids try CP QUERY SRM (write down response for reviewing ) and do this quick fix CP SET SRM STORBUF 300% 300% 300% -------------------------------------------------------- This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of O'Brien, David W. (NIH/CIT) [C] Sent: Thursday, March 20, 2008 1:37 PM To: IBMVM@LISTSERV.UARK.EDU Subject: Performance problem Linux under Zvm Our shop is new to Zvm and Linux. We have a very small number of Linux users who are reporting significant response time problems. It almost seems as if each stops running for a period of time and is then re-dispatched. Is there a VM parameter that we might have taken the default on that needs tweaking? Any help or advice appreciated as this is a proof of concept endeavour and we would like not to turn off prospective users from the start. Thank you, Dave O'Brien National Institutes of Health
