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- From: JONESD@kcgl1.eng.ohio-state.edu (David Jones)
- Subject: Re: re^2: extending INDEXF.SYS (new idea!)
- Message-ID: <1992Nov18.035253.17533@magnus.acs.ohio-state.edu>
- Sender: news@magnus.acs.ohio-state.edu
- Nntp-Posting-Host: kcgl1.eng.ohio-state.edu
- Organization: The Ohio State University
- References: <9211170506.AA25540@ucbvax.Berkeley.EDU>
- Date: Wed, 18 Nov 1992 03:52:53 GMT
- Lines: 33
-
- In article <9211170506.AA25540@ucbvax.Berkeley.EDU>, moeller@gwdgv1.dnet.gwdg.de writes:
- >Some time ago, there was some discussion re: pre-extending INDEXF.SYS,
- >and the consensus was, that one has to be very careful,
- >so that INDEXF.SYS won't become a multi-header file by any chance.
- >
- >It occurred to me that there is a VMS utility for extending files,
- >which *has* that important check built-in:
- >
- > $ MCR SYSGEN CREATE disk:[000000]INDEXF.SYS/size=<newsize>
- >
- >Successfully tested (on a PDA0: device)!
- >
-
- Did you check that the backup index file headers were updated as well? If the
- backup headers aren't kept current and you lose the primary, you'll lose all
- files in the extended zone. An analyze/disk on the volume might fix
- the backup headers, but I haven't experimented.
-
- A short time ago, a site on campus had the situation where INDEXF.SYS was
- extended into a multi-header file. This is a BAD THING - trying to mount
- the disk in this state caused XQP to lose its mind and crash the system.
- We were able to restore the volume by trashing the block with the primary
- index file header. The mount then used the backup index file header, which
- still had the original mapping pointers. Apparently the file headers in the
- extended region hadn't been used by any created files, so no files were lost.
-
-
- David L. Jones | Phone: (614) 292-6929
- Ohio State Unviversity | Internet:
- 1971 Neil Ave. Rm. 406 | jonesd@kcgl1.eng.ohio-state.edu
- Columbus, OH 43210 | jones-d@eng.ohio-state.edu
-
- Disclaimer: A repudiation of a claim.
-