Honestly Geoff, I think I'd have to tell them to stop smoke'n crack...
In reality, people do what is easiest for them and/or their application.
I'm sure it will be easier on them to make one big ~container~ for all their
~stuff~ rather than spread it out over lots of smaller areas.  They might
say "It will be subdivided via the directory structure" and if so I'd tell
them to then make each subdirectory an independent filespace.
Point out the simple things to them...
Is it quicker for one person to count from 1 to 13194139533312 (12 TB's)
Or for 2 people to each count from 1 to 6597069766656
Or for 4 people to each count from 1 to 3298534883328
Or for 8 people to each count from 1 to 1649267441664?
And remind them that all the paths, keys, locks, etc... of all the
components of "the big picture" have to be considered when designing such a
large environment.  (and sometimes you just have to let people shoot
themselves in the foot but make sure you have logged evidence saying "I told
you so")

Just my two cents worth...

Dwight


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Gill, Geoffrey L.
Sent: Wednesday, May 26, 2010 6:04 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] why create a 12TB LUN

I'm guessing many of you will find this quite odd, I know I did, but I
had someone come to me and say they were going to ask for a 12TB LUN and
wanted to back it up. Without even mentioning the product they want to
use, obviously not TSM though, and I'm not even sure it would make
difference, how would you manage to get a 12TB LUN backed up daily. I
would expect it to be at least 75% full if not more, and even without
knowing what percentage of data changes on it, it would seem to me the
request seems strange. They're thinking of getting a VTL and backing up
through fiber direct, not across the network, but no idea which one or
what sort of throughput to expect.



Have any of you been approached with this sort of request and if so what
was your response? I'm sort of dumbfounded at this point since I've not
heard or seen this anywhere.

Thanks,



Geoff Gill
TSM/PeopleSoft Administrator

SAIC M/S-B1P

4224 Campus Pt. Ct.

San Diego, CA  92121
(858)826-4062 (office)

(858)412-9883 (blackberry)