See below -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Donald Likens Sent: Friday, November 22, 2013 1:14 PM To: [email protected] Subject: Managing the OMVS Root zFS FileSystem
We have 5 isolated systems running clones of our z/OS operating system. Our current zFS root file system has not been controlled and now we are now using a Serverpac to upgrade. I am planning to implement the maintenance procedure at the bottom of this message but first here are my questions: 1) How do you control your root file system so that it is not updated? >> always mount it read only 2) How do you clone your root file system? >> using DFDSS at the filesystem level. Even on TECH, the root filesystem is >> mounted read only. You should have a SMPE only base environment that never >> gets IPL'd that you apply your maintenance to. Then clone everything to >> your sandbox for testing. Too easy for unintended changes to get made to a >> root filesystem. When doing maintenance, the maintenance root is mounted at >> /Service for the duration of the apply process, then unmounted when finished. 3) Is it your understanding that /u and /usr/local are made available by IBM for our use? >> possibly, but use those as a mountpoint only, for your own local filesystem. 4) Does anyone see improvements to my planned procedure that follows? >>Keep track of your root filesystem "modifications", and treat them as a >>usermod so that it is a repeatable process with future z/OS upgrades. >>consider making all your filesystems ZFS (if not already) as that is the >>future, HFS is functionally stabilized. With z/OS 1.13 we will name all USS file systems (including the root zFS ie. SYS1.OMVS.ROOT) that migrate with system maintenance to have a HLQ of SYS1 and that nothing other than what is shipped by IBM is located in the root zFS. Exception! To make this less impacting, we will add mount points already created to the root system each upgrade but future mount points will be added to the /u or /usr/local directories. We will have a two volume SYSRES (one containing PDSs the other containing USS files). The implementation process will be to IPL from SMPR13 and SMPF13, Make sure all is working well, Copy SMPR13 and SMPF13 over the production system res volumes, re-catalog the SYS1 zFS datasets, and IPL. To support not having anything in the root, all future non-IBM mount points will be in the /u or /usr/local directories will be pointing to the SYS.U.zFS and SYS.local.zFS respectively. We will also explore making the root system read only on all systems other than the Tech LPAR (for system maintenance). ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
