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- Path: sparky!uunet!franvm3.VNET.IBM.COM
- From: kraemerf@franvm3.VNET.IBM.COM (Frank Kraemer)
- Message-ID: <19921106.082746.756@almaden.ibm.com>
- Date: Fri, 6 Nov 92 17:28:32 CET
- Newsgroups: comp.unix.aix
- Subject: Re. A couple of answers
- Reply-To: kraemerf@franvm3.VNET.IBM.COM
- Organization: IBM Germany, BO-89 ACIS South
- Disclaimer: This posting represents the poster's views, not those of IBM
- News-Software: Usenet 3.0
- Lines: 51
-
- paul@acus1.cc.uky.edu (paul linton) writes :
-
- > back when 3.1 wasn't "GOLD" i was getting updates about every week or two
- > and i learned one could 'copy' the install tape to disk and do install/update
- > with the directory being the install device and it saved LOTS of time once
- > the installation began. I wanted to do this with the latest tape I received
- > but I havent done the above in a long time. I tried (restore -Tf/dev/rmt0.1)
- > but it said not in backup format. Any ideas?
-
- Tape format: (Install tape)
- ------------
-
- File 1 | File 2 | File 3 | File 4 | File 5 |.......| File n |
- --------+---------+---------+---------+---------+-------+---------+
- boot | display | toc | bos.obj | lpp-1 |.......| lpp-n |
- --------+---------+---------+---------+---------+-------+---------+
- dd | dd | dd | tar | restore |.......| restore |
- -------------------------------------------------------------------
-
- > what would be the 'brick walls' run into if someone were to want to write
- > a device driver to create a RAMDISK? Is there a way to have a program
- > 'lock down' a block of memory so that it doesn't get swapped? Other than
- > the 'difficulties' in writing a device driver would there be any obvious
- > problems with this particular one? (I'm not worried about the 'data loss'
- > factor invloved with a power loss).
-
- No need to reinvent the wheel. When the machine is started a RAM FS is
- created first in the boot sequence. The same is true if you are booting
- in maint mode from tape or diskettes. Try a 'mount' and you will see
- that the root filesystem is /dev/ram0. But other than that AIX uses a
- memory mapped filesystem - you won't see any more performance if you
- waste memory for filesystem purposes in normal operation mode - at least
- that's my understanding of how the systems works.
-
- frank ;-)
-
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