From:	CSBVAX::CSBVAX::MRGATE::"SMTP::CRVAX.SRI.COM::RELAY-INFO-VAX" 11-NOV-1988 21:49
To:	MRGATE::"ARISIA::EVERHART"
Subj:	RE: General scratch facility


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Date:     Fri, 11 Nov 88 17:35 N
From:     <MOS%HUTRUU51.BITNET@CUNYVM.CUNY.EDU> (Henk Mos /Fysisch Lab RU Utrecht/)
Subject:  RE: General scratch facility
To:       info-vax@kl.sri.com
X-Original-To:  jack@nrchep,info-vax@kl.sri.com, MOS

To enable the use of scratch space we created an account SCRATCH, with about
the same characteristics as DECnet (network only).

An entry for SCRATCH is created with subdirectories for every user
(directory name == username) of the scratch. Quota is enabled for
SCRATCH (200 Mbyte). In SYLOGIN.COM for every user a logical SCRATCH and
FSCRATCH is defined like:

$ username = F$GETJPI("","USERNAME")
$ DEFINE scratch  "nodename""scratch password""::[.''username']"
$ DEFINE fscratch "LCL$SCRATCH:[''username']"
$ scratch_s*pace == "@SYS$SYSTEM:tell nodename""scratch password"":: show quota"

LCL$SCRATCH is defined as disk:[scratch.]

To use the scratch, all they have to do are things like:

$ copy myfile.dat scratch
$ edit/edt scratch:data.txt
$ etc.

For fast read access (scratch uses decnet) they can use
fscratch. The command scratch_space informs how many blocks are available
in the scratch (using TELL.COM).

Every day at noon we run a selfrestarting batchjob to delete files
in the scratch which are older (modified date) then 7 days. One day
in advance users are informed (by the same batchjob) which of their
files will be deleted the next day (mail).

Advantages: Simple to use, one quota entry, no management
            Can be used from outside the cluster

Disadavantages: Uses DECnet (sometimes many FAL's running)
                Can be used from outside the cluster


        /Henk

--------------------------------------------------
+ Henk J. Mos           ++ Tel: 30 532239        +
+ University of Utrecht ++ MOS@HUTRUU51 (BITNET) +
+ Physics Laboratory    ++ RUUNSC::MOS (SURFNET) +
+ Computer Department   ++ PSI%13401480610::MOS  +
+ P.O. Box 80.000       --------------------------
+ 3508 TA  Utrecht      +
+ The Netherlands       +
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