z/VM has come with the directory defaulting to MAINT 2c2 disk accessed as c. I have always left it there because the 191 disk has too many accesses and changes. It seem to me that if you leave the directory on 2c2 it would less vulnerable to an accidental deletion or in my case, it would result in one less hole in my foot!
Loren Charnley, Jr. IT Systems Engineer Family Dollar Stores, Inc. (704) 847-6961 Ext. 3327 (704) 814-3327 [EMAIL PROTECTED] -----Original Message----- From: The IBM z/VM Operating System [mailto:[EMAIL PROTECTED] On Behalf Of Kris Buelens Sent: Monday, March 10, 2008 10:33 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: listing active user directory We've got MAINT B91 as backup of MAINT 191 since the VM/SP days. Our DIRBKP EXEC keep the last 9 levels of the CP directory there, as well as SYSTEM CONFIG; the result of a QUERY DASD and Q ALLOC. DIRBKP does not only maintain these backups but also performs some checks each night such as: is MDISK MAINT 298 (i.e. VTAM) still in the directory. Additionally, the 9 copies of the directory & co are also copied to a central SFS: so when a system is down due to disk errors, we know what is lost (touching wood: didn't need this for more than 10 years). 2008/3/10, Mike Walter <[EMAIL PROTECTED]>: > Maybe it would be better to keep the USER DIRECT file (or whatever you're > using as the source directory) off the 191 disk altogether, placing it on > a separate disk, and at "known address"? > > "Known address" could be defined in two parts: > > 1) Perhaps at cylinder 1 of a particular volser that you know and love > (and can remember in a crisis)? > 2) A new MAINT MDISK, maybe "5DD" (following VMSES/E's convention of the > '5' looking a bit like an 'S' when one squints ones eyes - the 5DD reminds > one of the SDD or 'S'ource 'D'irectory 'D'isk )? > > Or, following the "SYSTEM CONFIG" CF1/CF2/CF3 disk standards, a paranoid > sysprog could set up SD1, and SD2 disks. Where the live directory is on > the SD1 directory (at a "known extent on a "known" volume), always make a > backup copy to the SD2 disk (at a "known extent on a "known" volume) > before making any changes. That way if anything goes wrong you can always > go back one generation without needing to mount a tape. It vastly reduces > the chances of formatting *both* disks. It depends on your level of > paranoia. > > By placing it on a disk other than 191 one must be very sure to never copy > or save it to the 191 disk by accident or on purpose (just for a test, of > course) because then you have the "opportunity" to figure out which is the > real "USER DIRECT", or worse - which has some of the real entries and > which has the rest of the real entries. A good "PROFILE EXEC" could > easily check for such duplicate errors. > > Mike Walter > Hewitt Associates > Any opinions expressed herein are mine alone and do not necessarily > represent the opinions or policies of Hewitt Associates. -- Kris Buelens, IBM Belgium, VM customer support ************************************************************ NOTE: This e-mail message contains PRIVILEGED and CONFIDENTIAL information and is intended only for the use of the specific individual or individuals to which it is addressed. If you are not an intended recipient of this e-mail, you are hereby notified that any unauthorized use, dissemination or copying of this e-mail or the information contained herein or attached hereto is strictly prohibited. If you receive this e-mail in error, notify the person named above by reply e-mail and please delete it. Thank you.
