On Fri, 8 Dec 2006 07:47:45 -0600, John Benik <[EMAIL PROTECTED]> wrote:
>Every morning we run a job that does an STK CDS backup. About 1/2 hour >after the job starts we start seeing master start pendings on the volume >which holds the primary CDS. Once the backup step starts about 45 minutes >after the first start pending we then see a reserve on that volume while >that step runs, but it only lasts for about 2 - 3 minutes. Once the step >is done the start pendings and the reserve is gone. On occasion we have >seen other times that there are start pendings but the morning one does >happen everyday. > Perhaps something else is also RESERVEing that volume. There should only be a RESERVE while the backup is running (which sounds like 2-3 minutes). Do you have the primary *and* backup CDS on their own volumes or volumes that you are sure no other software issues RESERVEs to? If you run GRS STAR or have MII in a CF (and don't share the CDS across sysplex boundries) it should be safe to convert the reserve to a global ENQ - otherwise don't do it (I tried it once in a MII CTCONLY complex... things got ugly). Have you tried looking at RMFIII data or RMFMON or RMF post processor ENQ reports (you have to be collecting ENQ info) to see if they provide any hints? Mark -- Mark Zelden Sr. Software and Systems Architect - z/OS Team Lead Zurich North America / Farmers Insurance Group - GITO mailto:[EMAIL PROTECTED] z/OS and OS390 expert at http://searchDataCenter.com/ateExperts/ Systems Programming expert at http://expertanswercenter.techtarget.com/ Mark's MVS Utilities: http://home.flash.net/~mzelden/mvsutil.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
