Scratch partition...

Geraldo Pereira de Souza geraldo at cic.unb.br
Mon Dec 10 14:50:55 EST 2001


Robert,

> Unless you want it to survive a reinstall.  That is, you can create a
> scratch directory inside your basic root partition and give it the
> permissions of /tmp (we often call scratch /xtmp, for example).
Are there the scratch command in linux? I´m using Red Hat Linux 7 and i
can´t found this command...
I understood thar i must create a directory /scratch i the first PC of the
beowulf and than configure the partition, but i can´t execute the scracth
command!!!

> However, /xtmp will then get recreated if you do a full reinstall of /,
> and any data stored there will be lost.
Ok...

Thanks...

Geraldo Pereira de Souza (geraldo at cic.unb.br)
Laboratório de Sistemas Integrados e Concorrentes - LAICO
Universidade de Brasília - UNB

----- Original Message -----
From: "Robert G. Brown" <rgb at phy.duke.edu>
To: "Joel Jaeggli" <joelja at darkwing.uoregon.edu>
Cc: "Geraldo Pereira de Souza" <geraldo at cic.unb.br>; <beowulf at beowulf.org>
Sent: Friday, December 07, 2001 8:15 PM
Subject: Re: Scratch partition...


> On Fri, 7 Dec 2001, Joel Jaeggli wrote:
>
> > >
> > > Ok, but in my case, must i create this partition in the linux
instalation?
> >
> > nope...
>
> Unless you want it to survive a reinstall.  That is, you can create a
> scratch directory inside your basic root partition and give it the
> permissions of /tmp (we often call scratch /xtmp, for example).
> However, /xtmp will then get recreated if you do a full reinstall of /,
> and any data stored there will be lost.
>
> If you create an actual partition for /xtmp, you can easily arrange for
> it to be skipped in subsequent e.g. kickstart reinstalls.  That way if
> you for any reason (say a version upgrade, a corrupted library) need to
> reinstall the root partition you can do so without worrying about
> preserving anything a user may have written to /xtmp.
>
> Another thing to worry about is whether or not you back up "scratch".
> We don't (and I'd say that traditionally one doesn't) -- anything in
> /xtmp won't be cleaned out except on a FIFO basis when it fills and will
> likely survive a reinstall or upgrade, but neither will it be backed up.
> People use it for files that they CAN recreate by e.g. rerunning a
> numerical application but that they would RATHER stick around, or for
> particularly large initialization files.
>
>    rgb
>
> >
> > > Thanks,
> > >
> > > Geraldo Pereira de Souza (geraldo at cic.unb.br)
> > > Laboratório de Sistemas Integrados e Concorrentes - LAICO
> > > Universidade de Brasília - UNB
> > >
> > > ----- Original Message -----
> > > From: "Joel Jaeggli" <joelja at darkwing.uoregon.edu>
> > > To: "Geraldo Pereira de Souza" <geraldo at cic.unb.br>
> > > Cc: <beowulf at beowulf.org>
> > > Sent: Friday, December 07, 2001 6:11 PM
> > > Subject: Re: Scratch partition...
> > >
> > >
> > > > scratch is an old unix convention for a storage space which nobody
owns
> > > > (so using it doesn't affect anyone's quota) but which is more stable
than
> > > > /tmp (ie. it won't get flushed every day, or after reboots, or if it
runs
> > > > out of space)...
> > > >
> > > > joelja
> > > >
> > > > On Fri, 7 Dec 2001, Geraldo Pereira de Souza wrote:
> > > >
> > > > > People,
> > > > >
> > > > > In http://www.cacr.caltech.edu/research/beowulf/tutorial/beosoft/
> > > > > Starling describe how to build a beowulf system using some PC´s.
> > > > > I´m based in the tutorial to construct a beowulf system with 8
Pcs.
> > > Starling describe in the tutorial the the configuration of the nodes
to
> > > export the filesytem.
> > > > > In a point he say:
> > > > >
> > > > > "We decided to export scratch partition from all nodes and use
autofs to
> > > mount these from any node upon rquest. Our exports file looks like:
> > > > > /scratch n???.cacr.caltech.edu(rw,no_root_squash)"
> > > > >
> > > > > I´m new with administration of linux, but my question is: What is
> > > scratch partition?
> > > > > Must i create the directory /scratch ?
> > > > >
> > > > >
> > > > > Thanks,
> > > > >
> > > > >
> > > > > Geraldo Pereira de Souza (geraldo at cic.unb.br)
> > > > > Laboratório de Sistemas Integrados e Concorrentes - LAICO
> > > > > Universidade de Brasília - UNB
> > > > >
> > > >
> > > > --
> > >
> --------------------------------------------------------------------------
> > > > Joel Jaeggli       Academic User Services
joelja at darkwing.uoregon.edu
> > > > --    PGP Key Fingerprint: 1DE9 8FCA 51FB 4195 B42A 9C32 A30D
     --
> > > > The accumulation of all powers, legislative, executive, and
judiciary, in
> > > > the same hands, whether of one, a few, or many, and whether
hereditary,
> > > > selfappointed, or elective, may justly be pronounced the very
definition
> > > of
> > > > tyranny. - James Madison, Federalist Papers 47 -  Feb 1, 1788
> > > >
> > > >
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>
> --
> Robert G. Brown                        http://www.phy.duke.edu/~rgb/
> Duke University Dept. of Physics, Box 90305
> Durham, N.C. 27708-0305
> Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb at phy.duke.edu
>
>

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