[dba-Tech] Security measures

I use RAID mirrors (hardware) but a disk mirror is only usefull for a
disk crash, not a system crash.
If your OS crashes your mirror is a mirror of your crashed system :-(

=>Yep, that's why there is a 3rd drive in the system I described.  You just plug in the third, remove the first two and the 3rd will
run.  (This can be readily tested during drive swaps.)
Then overwrite the other two in turn.

Kind regards,
David
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----- Original Message -----
From: "Erwin Craps" <Erwin.Craps at ithelps.be>
To: "Discussion of Hardware and Software issues" <dba-tech at databaseadvisors.com>
Sent: Thursday, August 28, 2003 7:50 PM
Subject: RE: [dba-Tech] Security measures



I once knew a power supply putted more than 5/12 volt on both drives...
And both death...



Number one rule in good backups is:
The backups should be in a other location!!!
For reason of
-Fire
-Water
-Accidents (wire trippling)
-Terrorists acts..
-Hackers
-Virusses
-Stupidities

For what concerns removable disks.
You know that any (ATA) disk above 512MB should be used on the
controller/bios that formatted the drive.
If you write on a disk formatted by an other system (controller) you
risk corrupting the drive.
This is due to the sector translating trics controllers use (or
something).
In my experiance I never had any problem reading a drive (installed as a
second disk). Writing does give problems inmediate or after a while (can
be months).

I don't know the story with USB/Firewire, but I supose the controller is
in the disk box and this should not be a problem.
Erwin