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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!paladin.american.edu!auvm!UMINN1.BITNET!IJIM
- Message-ID: <L-VMCTR%92082817173633@VM1.CC.UAKRON.EDU>
- Newsgroups: bit.listserv.l-vmctr
- Date: Fri, 28 Aug 1992 14:33:56 CST
- Sender: VMCENTER Components Discussion List <L-VMCTR@AKRONVM.BITNET>
- From: Jim Colten <IJIM@UMINN1.BITNET>
- Subject: Re: Last date a minidisk was updated.
- In-Reply-To: Message of Fri, 28 Aug 1992 15:03:06 EDT from <RWWMAINT@MSU>
- Lines: 38
-
- >>Hi,
- >> Am I wrong or does moving a minidisk with VMSECURE change the
- >>"last updated" date you see when you do a MDSKSCAN or run the VMRMUA
- >>report? If so, how do I work around this? I want to clean old minidisks
- >>off a couple of volumes. Thanks. T.S.
- >
- >I believe that date is simply the latest file update timestamp
- >encountered for that minidisk; ie. moving the minidisk will
- >not change the timestamp. We run our Clearvol process (front
- >end to VMSECURE) to clear entire volumes without worrying about
- >changing any data or timestamps within minidisks.
- >
-
-
- Well, that depends. Here is what I see (VMSECURE 4.0, CMS5):
-
- 1) look at the FILE timestamps on a disk
- 2) do a VMSECURE MDSKSCAN for the disk
- 3) move the disk, same device-type, same size
- 4) repeat steps 1 & 2 above, neither the FILE timestamps nor the
- last update timestamp reported by MDSKSCAN show any change.
- 5) move the disk to a different device-type (3380->3370)
- 6) repeat steps 1 & 2 above, the FILE timestamps are preserved, but
- MDSKSCAN indicates that the disk was updated TODAY.
-
- I believe that this is because MDSKSCAN takes its info from a timestamp in
- the CMS file system's directory on the mdisk, not from file timestamps,
- from a directory timestamp.
-
- I also believe that VMSECURE will use DDR to move a disk when DDR is a
- viable option (same device architecture, same size). Otherwise it will
- use COPYFILE (or alternative). With DDR, the entire disk image, including
- the file system directory is moved intact, with no change. With COPYFILE,
- only the data is kept intact, the physical structure of the file system
- will changed, and the file system directory will be re-written (more than once)
- and will contain today's filestamp.
-
- Jim Colten
-