In addition to what everyone else has told you about selective maintenance, we have gotten our zLinux customers to accept a weekly outage for consistent disaster recovery backups. Once a set of updates has been applied to the test system, tested there and then approved by the change control process, I can use that backup window to recycle without interfering with the customers. There are other times when I piggyback my changes onto Timezone and z/OS outages.
/Tom Kern /301-903-2211 -------------- original message -------------- > From: "Sikich, Frank J." <[EMAIL PROTECTED]> > > Hello All: > I am wondering how everyone handles maintenance in your VM > environment with your zLinux instances. We are trying to push to move > some of our UNIX servers to zLinux but the argument that arises each > time we apply maintenance we have to cycle VM (when we do a put2prod). > In the last month we went to 5.2, DST maintenance and we found we were > missing a PTF for PerfMon. This cause us to have to cycle VM and drew > some concerns from our zLinux users. The struggle is that our midrange > world claims to apply patches to the UNIX servers only once or twice a > year and they are concern that they will have more interruption on > zLinux. I hope other shops encountered this argument and I am hoping > you can give me insight on combating it. > > Also to note we just implemented z/VM on two CEC's and plan to allow > failover between the two machines. I am hoping this will resolve some > issues. We are in the infant stages of implementing z/VM and z/Linux > but we are trying to get it right the first time. I have searched and > found all the HA doc's and Redbooks but I am looking for any input on > this issue.
