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- From: mark@infocomm.com
- Newsgroups: comp.os.vms
- Subject: Re: SYSDUMP.DMP File Question...
- Message-ID: <1993Jan8.140802.21116@infocomm.com>
- Date: 8 Jan 93 14:08:02 PST
- References: <01GT8GQOG042009SF1@VAXF.COLORADO.EDU>
- Distribution: world
- Organization: INFO COMM - Computer Consulting, Redwood City, Ca
- Lines: 55
-
- In article <01GT8GQOG042009SF1@VAXF.COLORADO.EDU>, DWING@UH01.Colorado.EDU (Dan Wing) writes:
- > Scott R. Daniels, SRD@RCKHRST1.BITNET, writes:
- >
- >> Is there a way to have the system look on a different disk for the
- >>SYSDUMP.DMP file ?
- >
- >No. The crash-dump file must be on the system disk. You can, however, have
- >the system write its crash-dump to the pagefile, but I believe that pagefile
- >must be on the system disk to be used as a crash-dump area. This is done
- >by setting SAVEDUMP to 1.
-
- Bzzt. Wrong. The dump will always be written to the pagefile if there
- is no dump file AND the pagefile is on the system disk and is known as
- SYS$SYSTEM:PAGEFILE.SYS.
-
- SAVEDUMP being one says that given the possibility of a pagefile
- (meeting the above constraints), then the pagefile space which contains
- the system dump will not be used for paging backing store until after
- the dump it contains has been analyzed.
-
- >>And is it also true that enough disk space should be allocated so that
- >>ALL memmory can be dumped into it ?
- >
- >If DUMPSTYLE is 0, you need a dumpfile big enough for all of memory.
-
- Almost right. With DUMPSTYLE as 0, the dump file must be as big as
- memory PLUS the necessary room for the dump header.
-
- >If DUMPSTYLE is 1, use the values that AUTOGEN gives you.
-
- The size of the dump header has floated around (usually up) from one
- release of VMS to another, AUTOGEN knows how to compute the correct dump
- file size.
-
- >AUTOGEN will tell you the appropriate size depending on your setting of
- >DUMPSTYLE (0=dump all memory, 1=selective dump). I'd add about 100 blocks
- >to AUTOGEN's recommendation to ensure it was big enough (AUTOGEN under-
- >calculated the size of a selective dump in some versions of VMS).
-
- Adding an extra 100 blocks is certainly safe, but what probably happened
- here is that you may have tried to continue to use an old dumpfile that
- had been previously defined with an older version of VMS.
-
- >>We just doubled our memory to 128MB, and we
- >>don't really have the room to put a 262,144 block SYSDUMP file on the system
- >>disk. Any ideas would be greatly appreciated.
- >
- >Use DUMPSTYLE=1, or have your crash-dump file go into your page file.
-
- Good advise with the above caveats.
-
- --
- Mark Pizzolato - INFO COMM Computer Consulting, Redwood City, Ca
- PHONE: (415)369-9366 UUCP: decwrl!infopiz!mark or uunet!lupine!infopiz!mark
- DOMAIN: mark@infocomm.com
-