NSS question
Is it possible to have duplicate, active entries in the NSS? (sort of a trick question; it appears that we do.) See below: *NSS 0014 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT *NSS 0059 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT I am pretty sure I did this by restoring, using SPXTAPE, the NSS twice. My question or assumption is that I thought, when a duplicate entry is restored, it would flagged the existing one as purged/deleted/removable (what ever the correct term is). Could someone explain this? Please and thank you. Steve
Re: NSS question
SPXTAPE LOAD can create multiple active entries. It is in the HELP for SPXTAPE. Regards, Richard Schuh From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Gentry, Stephen Sent: Thursday, July 09, 2009 1:45 PM To: IBMVM@LISTSERV.UARK.EDU Subject: NSS question Is it possible to have duplicate, active entries in the NSS? (sort of a trick question; it appears that we do.) See below: *NSS 0014 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT *NSS 0059 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT I am pretty sure I did this by restoring, using SPXTAPE, the NSS twice. My question or assumption is that I thought, when a duplicate entry is restored, it would flagged the existing one as purged/deleted/removable (what ever the correct term is). Could someone explain this? Please and thank you. Steve
Re: NSS question
Yup, use Q NSS USERS GUICSLIB to see who is accessing which one and then PUR NSS xxx the one not being used. It's a cleanup I've done many times when I've restored all the NSS files and there were still some out there from before whatever happened that made me need to restore them. Bob Bates Enterprise Hosting Services w. (469)892-6660 c. (214) 907-5071 This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation. From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Gentry, Stephen Sent: Thursday, July 09, 2009 3:45 PM To: IBMVM@LISTSERV.UARK.EDU Subject: NSS question Is it possible to have duplicate, active entries in the NSS? (sort of a trick question; it appears that we do.) See below: *NSS 0014 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT *NSS 0059 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT I am pretty sure I did this by restoring, using SPXTAPE, the NSS twice. My question or assumption is that I thought, when a duplicate entry is restored, it would flagged the existing one as purged/deleted/removable (what ever the correct term is). Could someone explain this? Please and thank you. Steve
Re: NSS question
Steve--Yes, it is possible to have duplicates and not have the older
entry flagged as being to be purged. I don't remember which one's have
to be manually handled, perhaps the DCSS's. I know that in resaving
CMS, the older CMS NSS always get flags as being purged and will stay
there in that state until the last user releases it. I've forgotten the
rules or reasons. Alan Altmark explained this several years ago when I
ran into the same problem. Since then I've always made a point of
purging the older one to make sure.
Jim
Gentry, Stephen wrote:
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Is it possible to have duplicate, active entries in the NSS? (sort of a
trick question; it appears that we do.)=20
See below:
=20
*NSS 0014 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT=20
*NSS 0059 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT
=20
I am pretty sure I did this by restoring, using SPXTAPE, the NSS twice.
My question or assumption is that I thought, when a duplicate entry is
restored, it would flagged the existing
one as purged/deleted/removable (what ever the correct term is).=20
Could someone explain this?
Please and thank you.
Steve
=20
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Jim Bohnsack
Cornell University
(972) 596-6377 home/office
(972) 342-5823 cell
jab...@cornell.edu
NSS question
I am pretty sure I did this by restoring, using SPXTAPE, the NSS twice. My question or assumption is that I thought, when a duplicate entry is restored, it would flagged the existing one as purged/deleted/removable (what ever the correct term is).=20 Could someone explain this? By default, SPXTAPE LOAD will load an NSS that may duplicate one that is already active on your system. SPXTAPE will load the NSS from tape with the same class that it was SPXTAPE DUMPed with. SPXTAPE was intentionally designed to operate this way; we didn't want the code to decide for you which of the 2 NSSes you really want to keep. There is a NODUP operand that you can use to prevent SPXTAPE from loading a file from tape the duplicates an existing file: NODUP prevents the loading of any file that would duplicate a file that already exists on the target spooling system queue. For additional information, see usage note 4. Usage Note 4: 4. When using the NODUP operand, the definition of duplicate depends on the type of file. For standard spool files and system trace files, duplicate means that all the file attributes of the file on the tape are identical to a file on the queue. This includes the time stamp for when the file was opened. An identical time stamp indicates that they are identical files. (If some files on the system have been imported from other systems, it is possible that files could have been created on both systems at exactly the same microsecond with all the same file attributes, but contain different data. However, this is not very probable.) For system data files other than system trace files, duplicate means that the file name, file type, and class of the file on the tape are identical to the file on the queue. In addition, for named saved system and saved segment files, class A (active) and class R (restricted) files of the same file name and file type are considered duplicate because they cannot exist on the system at the same time. A file that is found to be a duplicate is identified in the resulting volume log with DUP_FILE in the SEG_STAT field. The FILE field of this entry in the log contains the file ID of the file already on the system. If the file on the system is moved to a different queue or user ID, or its file attributes are changed (for example, its spool class), the file is no longer identified as a duplicate. The NODUP operand helps you recover if a system failure occurs while you are loading files from tape. If you add the NODUP operand to your selection criteria and reprocess all the tapes that have already been processed, all the files that loaded correctly before the system failure are skipped. However, even with NODUP specified, you may still receive duplicate files if you are loading the same file concurrently from more than one tape. Keep in mind when using the NODUP operand that as the number of files in the queue where the files are being loaded increases, the amount of processing required to load the files from the tape increases dramatically. Each file to be loaded is compared to every file in the queue. For example, if the queue contains 1000 files and 1000 files are to be loaded, the result is over one million comparisons. The consequence of loading duplicate files is more serious for system data files than for standard spool files. If the NODUP operand is not used when loading system data files (or all files) from a tape for which no dump log is available, you should check to make sure that duplicate files were not loaded. If this happens, check the files to determine which should be kept and purge the unnecessary files. John Franciscovich z/VM Development
Re: NSS question
Ok, just read the HELP info. Thanks. Why does VM/CP/NSS/? allow both entries to be active? How does it know which one to use? First one it finds? From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Schuh, Richard Sent: Friday, July 10, 2009 8:56 AM To: IBMVM@LISTSERV.UARK.EDU Subject: Re: NSS question SPXTAPE LOAD can create multiple active entries. It is in the HELP for SPXTAPE. Regards, Richard Schuh From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf Of Gentry, Stephen Sent: Thursday, July 09, 2009 1:45 PM To: IBMVM@LISTSERV.UARK.EDU Subject: NSS question Is it possible to have duplicate, active entries in the NSS? (sort of a trick question; it appears that we do.) See below: *NSS 0014 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT *NSS 0059 NSS A 0258 10/23 22:06:14 GUICSLIB DCSS MAINT I am pretty sure I did this by restoring, using SPXTAPE, the NSS twice. My question or assumption is that I thought, when a duplicate entry is restored, it would flagged the existing one as purged/deleted/removable (what ever the correct term is). Could someone explain this? Please and thank you. Steve
Re: NSS question
On Fri, Jul 10, 2009 at 9:10 AM, Gentry, Stephen stephen.gen...@lafayettelife.com wrote: Ok, just read the HELP info. Thanks. Why does VM/CP/NSS/? allow both entries to be active? How does it know which one to use? First one it finds? CP. And you've sort of answered the 2nd (of 4) questions yourself: it allows both to be active because it *doesn't* know which one to use. It uses the first one it finds. Consider someone doing an SPXTAPE RESTORE and loading more NSS files than they realized were on the tape: if it replaced the class A entries with the ones from the tape, all hell would/could break loose. Far better to allow the duplication and let you clean up the mess...
