Then again, we use VM:Backup and copy our data to tape. -----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 -------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. --------------------------------------------------------
