On Jun 16, 2010, at 10:20 AM, john CARMONNE wrote:

>> 
>> Just remember with great disk capacity comes great backup needs. We just 
>> spent $18K to upgrade our tape backup systems to (barely) keep up with our 
>> ever increasing file server space; we really need to spend $30K on a 
>> disk-disk system.
> 
> When you say tape do you mean magnetic tape? or is that just a term for a 
> backup device, I haven't seen a tape backup for fifteen years even on my CNC 
> equipment because virtually no speed and unreliability. But that may pin me 
> to lack of knowledge too.:-)

Brand new HP MSL-2024 LTO-4 cassette tape system, holds 24 LTO-4 tapes capable 
of holding 1.6TB each (compressed). Backs up ~860 GB/hr.

<http://tinyurl.com/24vjxsw>

Tape still rules for backups; when I mentioned Disk-Disk I'm referring to our 
preferred systemof having another large SAN, backup the production volumes to 
the backup SAN, and then run the tape backups off of that. Much faster primary 
backups, sort of like a giant CCC backup, which makes for very fast restores, 
and keeps the production volumes at maximum availability longer.

And then you get into the petabyte territory:

<http://www.arsc.edu/resources/silo.html>


-- 
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs


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