[dba-Tech] Security measures

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

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 :-(

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



-----Original Message-----
From: Steven W. Erbach [mailto:serbach at new.rr.com] 
Sent: Thursday, August 28, 2003 1:59 AM
To: Discussion of Hardware and Software issues
Subject: Re: [dba-Tech] Security measures


John,

>> They are costly, a PITA and not really very reliable. <<

Lemme hear ya say, "Amen!"

>> I would think it would be less expensive and easier to
manage than tape backups <<

At the moment I'm cloning to identical drives inside my PCs. If there's
a fire...

So, the advice about removable hard drives is very good.

Regards,

Steve Erbach
Scientific Marketing
Neenah, WI

If architects built buildings the way programmers built applications,
the first woodpecker to come along would cause the end of civilization.


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