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- Newsgroups: comp.sys.mac.system
- Path: sparky!uunet!paladin.american.edu!darwin.sura.net!blaze.cs.jhu.edu!rhombus!scott
- From: scott@rhombus.cs.jhu.edu (Scott Smith)
- Subject: Re: Duo's: Are Redundant Systems A Good Idea?
- Message-ID: <1992Dec24.023508.7839@blaze.cs.jhu.edu>
- Sender: news@blaze.cs.jhu.edu (Usenet news system)
- Organization: Johns Hopkins Computer Science Department, Baltimore, MD
- References: <562@blue.cis.pitt.edu> <1992Dec13.184407.16748@nwnexus.WA.COM> <1992Dec14.000559.271@blaze.cs.jhu.edu> <wallich.725062591@lupine>
- Distribution: na
- Date: Thu, 24 Dec 1992 02:35:08 GMT
- Lines: 54
-
- wallich@ncd.com (Ken Wallich) writes:
-
- >Basically, anything that would waste your RAM disc will hose your
- >machine. When my RAM disc would crash, it still thought it was the
- >boot volume, and hung trying to boot from a now garbage "disc". I had
- >to use a floppy to recover. You'll "usually" be ok, but I'd trust
- >my hard drive more.
-
- I did this once (hosed my RAM system disk intentionally to see what
- would happen), and restarting would not work. However, shutting down
- (by the switch on the back) caused the computer to erase the RAM disk
- and I booted fine.
-
- >Of course, if you had a floppy, or you could hook your machine up via
- >the dock you don't have to another machine, you could create two
- >partitions on your single hard drive, and dedicate one just to be a
- >system volume, and put a backup on the other partition. You can't do
- >that unless you can back up the drive first though. So, once you have
- >the dock, alleviating the worry, you can do something about it :-).
-
- You can in fact do this by backing up over Appletalk or a modem. I
- have thought about doing this. Its actually not so bad as long as you
- go eat dinner during the backup, and you have a destination machine
- with lots of free disk space.
-
- One thing I want to correct. I said in my previous post:
-
- >>The only solution I know of is to create a RAM Disk and put a minimal
- >>system folder there (make aliases for the noncritical stuff, pointing
- >>to the hard disk version), and make the RAM disk your startup disk.
-
- It turns out many things can't be aliased in a system folder. That
- means you need a big (wasteful) RAM disk to do it this way.
-
- My current method is to use a different approach: I just keep a backup
- minimal system on a small RAM disk. I "spend" 1.5M of RAM for this
- insurance. This is the opposite of what I described above, I normally
- use the disk-based system and the RAM one is just a backup in case my
- hard disk crashes. As long as I can restart the computer without
- powering down, the RAM disk should boot if my hard disk won't mount.
- (Right?) Then I would use appletalk or a modem (be sure to have
- approp. files on the RAM disk or there is an accessibility problem) to
- restore.
-
- I think this method will work OK, and should not be any major time
- drain as long as the disk doesn't crash too often (or better yet,
- never!)
-
- Scott
- --
-
- ------------------------------
- Scott Smith, scott@cs.jhu.edu
- ------------------------------
-