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Collaborative Computational Project Number 14

for Single Crystal and Powder Diffraction


Default SGI O2 root crontab file and misc other things

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default SGI O2 IRIX 6.5.11 root crontab file

Sometimes a guy gets lonely . . . . Sometimes a guy gets confused . . . Sometimes a guy accidentally does crontab .crontab when he thinks he is in user mode when he is really in root mode.

Then (after some very quick patching up of the damage) a guy wonders how he can quickly get his default root crontab file back (/var/spool/cron/crontabs/root). Thus:

Booting an SGI O2 without a graphics screen

Subject:  Re: O2 upgrade to 6.5.11m with 1600SW: nogo
Date:   Tue, 27 Mar 2001 10:10:24 +0200
From:   Alexis Cousein [al@brussels.sgi.com]
Organization:   Silicon Graphics Inc., Mountain View, CA
Newsgroups:   comp.sys.sgi.admin

malin@bic.mni.mcgill.ca wrote:

> Hello,
> I just upgraded an O2 from 6.3 to 6.5.11m with a Flatpanel 1600SW and a
> MLA. I did the upgrade using a normal crt (because of high magnetic
> fields I cannot do them in place) and without cleaning the disk (no
> mkfs) and upon returning the O2 to its normal location and reconnecting
> the flatpanel, the machine does not boot anymore! The leds are yellow on
> the unit and flatpanel, but the 1600sw just stays blank. 

[this] Doesn't mean the machine doesn't boot.

Connect a terminal to serial port #1 and see whether it really boots. If 
it does, use /usr/gfx/setmon -x 1600x1024_60p and restart gfx 
(/usr/gfx/stopgfx; /usr/gfx/startgfx) and see what that does.

Alexis Cousein                          Senior Systems Engineer
SGI Belgium and Luxemburg               al@brussels.sgi.com

How to make software run fast

Subject:  Re: Some signs SGI is not as cool as once before
Date:  Tue, 27 Mar 2001 11:42:09 +0000
From:  Ian Mapleson [i.mapleson@salford.ac.uk]
Organization:    University of Salford
Newsgroups: comp.sys.sgi.misc

"Ben Cannon (on hey)" wrote:
> or simply a 35mm VISTA frame in 16bit rgba is around 200MB/frame.....
> Damn ir3 rules :)

I know of one studio who arranged to have one of the more widely known
sw packages (Flame, whatever. Forget which) blown onto custom ASICs
and shoved onto an XIO board. Badoom, now in hw not sw, runs 100X faster
than normal. :D

Charge $1000/hour for video editing services, several users at once,
the Onyx2 pays for itself in a few weeks, buy another one...

Rock on Ben!


Scrubbing an SGI Hard-disk

Subject:  Re: Help: blank SGI Indy HD, IRIX 5.3
Date:  Thu, 5 Apr 2001 14:56:06 -0500
From:   Brent Casavant 
Organization:   "Silicon Graphics, Inc."
Newsgroups:   comp.sys.sgi.admin

On Thu, 5 Apr 2001, ckb wrote:

> Unfortunately, I have no idea how to even go about doind this.  Would anyone
> here be willing to help me?
> I can turn them on and log on as root, but that's about as far as I know how
> to get.
> I would assume that something like
> rm *
> would work, but I do not know if this is my best option.  Maybe a reformat?
> Or repartition?

The most thorough "easy" way would be to use dump /dev/zero over the
entire contents of the hard drive. I would go into more detail, but
since I can't expose SGI to liability in the case that this does or
does not work or fails in some way, I won't say any more than that.

Also, any malicious and well-funded organization can probably still
recover the data from residual magnetic fields on the disk surface.
It's enough for the casually paranoid however.


Brent Casavant            bcasavan@sgi.com
Kernel Engineer           http://reality.sgi.com/bcasavan
Silicon Graphics, Inc.

Scrubbing an SGI Hard-disk

Subject:    Re: How to boot & install from a local disk?
Date:   4 Apr 2001 19:16:41 GMT
From:   wolfi@munich.sgi.com (Wolfgang Szoecs)
Organization:  Silicon Graphics - Munich, Germany
Newsgroups:   comp.sys.sgi.hardware, comp.sys.sgi.admin

In article [3ACB4D6E.27A81270@salford.ac.uk],
        Ian Mapleson [i.mapleson@salford.ac.uk] writes:
> I want to install IRIX (6.5) from a locally attached disk. I have the
> volume header correctly setup (fx runs fine) and the rest of the
> CD data is ready to read, but how does one get the PROM sw installation
> section to begin the miniroot installation from a disk instead of local
> CDROM, local tape, or remote-whatever? The disk is a 9GB attached
> externally to an Indigo2. Path to the base OS CD is /cds/6.5inst/dist,
> while the others are at /cds/6.5F1, /cds/6.5F2 and /cds/6.5A.
> Nice to see fx loading so fast though. 8)

several possible ways, here my so called 'simple-setup' one:

a.) your disk's layout should look like this:
    (let's assume /inst - shorter to type)

        /inst/mr <--- obtained via: mkboottape -f sa -x mr

1.) sash
2.) cp -b 32k dksc(0,1,0)/inst/mr dksc(0,1,1)
3.) boot -f dksc(0,1,0)/inst/miniroot/unix.IP30 --m

voila, miniroot from xfs-disk !


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