home *** CD-ROM | disk | FTP | other *** search
- Xref: sparky vmsnet.sysmgt:413 comp.os.vms:19701
- Path: sparky!uunet!cs.utexas.edu!zaphod.mps.ohio-state.edu!usc!elroy.jpl.nasa.gov!nntp-server.caltech.edu!SOL1.GPS.CALTECH.EDU!CARL
- From: carl@SOL1.GPS.CALTECH.EDU (Carl J Lydick)
- Newsgroups: vmsnet.sysmgt,comp.os.vms
- Subject: Re: Pagefile size and distribution guidelines desired
- Date: 22 Dec 1992 06:18:46 GMT
- Organization: HST Wide Field/Planetary Camera
- Lines: 55
- Distribution: world
- Message-ID: <1h6c06INN9ks@gap.caltech.edu>
- References: <1992Dec21.092049.1074@beckman.com>
- Reply-To: carl@SOL1.GPS.CALTECH.EDU
- NNTP-Posting-Host: sol1.gps.caltech.edu
-
- In article <1992Dec21.092049.1074@beckman.com>, dsroberts@beckman.com writes:
- >We managed to work out getting a pair of two two gigabyte disks to replace two
- >ra92's for our set of "system" packs. By system packs, in this case, I mean
- >where we put the layered products, page files, etc. As opposed to user data
- >:-). So, for the first time in a while, we can make our page files bigger.
- >And contiguous. WHat guidelines do others use for determining the proper size
- >for pagefiles?
-
- Try to make your pagefiles big enough that they're never more than 2/3 used.
- Or, if you're willing to trust DEC, simply do an AUTOGEN with feedback.
-
- >As we don't have a defragmentor the problem we've run into in
- >the past is that if we make them too small we are not later able to make them
- >contiguous until we can do an image backup and restore (almost never
- >unfortunately).
-
- AUTOGEN will tell you how bit it thinks the files should be. If it can't
- create them, you need to do a BACKUP/RESTORE.
-
- >Currently we have two 100,000 block page files each for our
- >6420 and 6520, and this is a tad small.
-
- Well, based on what you've told us, how were we to know? You might be running
- a system with only one user who only runs stuff he's ported from a CP/M system
- with 64K memory.
-
- THE NECESSARY SIZE OF THE PAGEFILES DEPENDS ON HOW MANY USERS YOU'VE GOT AND
- HOW LARGE THEIR APPLICATIONS ARE!
-
- Geez! I'd've thought that would've been obvious!
-
- Use AUTOGEN!
-
- >Another thing I've never seen
- >guidelines on is number of page files. Does it do any good to put multiple
- >page files for one system on one disk?
-
- Obviously not. All you achieve that way is to fragment your pagefile!
-
- >If we have multiple page files per
- >system on several disks, but those pagefiles are on the same disks as the
- >pagefiles for other systems, isn't that just as bad?
-
- No. For each system, you should have at most one page file on each disk.
- Optimally, you should only have page files on local disks. Once you've got
- page files on non-local disks, optimal placement is *HIGHLY* dependent on the
- characteristics of your particular cluster.
- --------------------------------------------------------------------------------
- Carl J Lydick | INTERnet: CARL@SOL1.GPS.CALTECH.EDU | NSI/HEPnet: SOL1::CARL
-
- Disclaimer: Hey, I understand VAXen and VMS. That's what I get paid for. My
- understanding of astronomy is purely at the amateur level (or below). So
- unless what I'm saying is directly related to VAX/VMS, don't hold me or my
- organization responsible for it. If it IS related to VAX/VMS, you can try to
- hold me responsible for it, but my organization had nothing to do with it.
-