And I hear that ReiserFS is faster than ext2.
I wish I had know about this things when I first built this box.
But now that I get to start over ...
My buyer just told me that the Promise FastTrak 100 Ultra
ATA/100 RAID card is $115.00.
Thanks
>>> [EMAIL PROTECTED] 12/7/2000 3:48:10 PM >>>
Hardware aside, you need a journaled filing system, as Jakob
suggested.
Journaling works via transactions, and is used in more than
just
filesystems. Microsoft SQL and Exchange are two products I know
that use
journaling. Here's how it works.
Let's say we want to remove $100 from your bank account and put
it in mine.
First we subtract $100 from yours, then add $100 to mine. If
the computers
crash after removing money from yours that $100 is lost in a
non-journaled
banking system.
If it was journaled, it would go like this:
Begin
Subtract $100 from bob
Add $100 to cory
commit
Either both things happen, or neither. The transactions are put
in to a log
file. Once the begin and commit are in the log, the database(or
filesystem)
is then updated. This enables a filesystem or database to erase
unfinished
transactions, without caring what they did to the filesystem
(because they
didn't do anything, yet).
With ReiserFS, you can pull the plug on it. When it boots up
the filesystem
doesn't check the whole system like ext2fs. Instead it only
looks at it's
transaction log, and either erases or commits transactions.
There is the possibility of the outage happening at just the
wrong
moment.... However, this is clearly a better approach than a
non-journaled
filesystem for a redundant application. The ReiserFS sits on
top of the
ext2fs.
Mike was telling me about the X file system that is coming out.
Also
journaled. (Has nothing to do with XFree86). Perhaps he can
share a bit.
Cory
-----Original Message-----
From: Bob Crandell [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 07, 2000 3:29 PM
To: [EMAIL PROTECTED]
Subject: [EUG-LUG:5216] Mirror
Question:
Is there a mirroring solution for Linux that is reliable? For
example, in the middle of copying a file to the drive, pull the
plug. Do you loose the file? or the whole partition?
Explanation:
I built a NAS box for a client. It interacts with Novell 5.1
and is an FTP server for an Axis scanner. This box also serves
a
CDROM tower. That's why I didn't sell them a SNAP.
The Problem:
The mother board choked on a bone or something and went down.
When I finally got it back up, the mirrored drives were toast.
I'm glad I told them to wait.
