I've got a customer with multiple Windows servers having multiple LUNS
with over 30M files, one is over 75M.
(and of course, the developers claim there is no way to modify the
architecture...)

Journaling is the ONLY way we can back them up.
(And yes, I've told them they can't restore the puppies in anything
close to a reasonable time period...)

Journaling relies on a Windows facility to monitors file system changes.
If the files change too fast for the monitor, or the change rate is
above 10% per day, that's when journaling is NOT recommended.

W


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Kelly Lipp
Sent: Thursday, May 27, 2010 1:00 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] why create a 12TB LUN

Hmmm.  I don't know about that. I thought that's what journaling was
for!  Now, I suppose if you have a lot of files and a lot of them
changing you could have a problem.  But I'm guessing this beast won't
have that many changes...

Kelly Lipp
Chief Technology Officer
www.storserver.com
719-266-8777 x7105
STORServer solves your data backup challenges. 
Once and for all.


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Fred Johanson
Sent: Wednesday, May 26, 2010 7:44 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] why create a 12TB LUN

Kelly,

Once upon a time, or midnight dreary, journaling was not recommended for
filespaces with lots of files.  Has this changed?


________________________________________
From: ADSM: Dist Stor Manager [ADSM-L AT vm.marist DOT edu] On Behalf Of Kelly
Lipp [lipp AT STORSERVER DOT COM]
Sent: Wednesday, May 26, 2010 8:06 PM
To: ADSM-L AT vm.marist DOT edu
Subject: Re: [ADSM-L] why create a 12TB LUN

Geoff,

As you well know, it isn't the 12TB that's the problem: it's the 40M
files they're going to put on it!

Actually, I think TSM is the only thing that will be able to backup such
a thing.  Incremental forever is the only way.  Put Journaling on and it
gets done.

Now, that's backup.

Forget restoring it!  That won't happen in any reasonable amount of time
now will it?

Kelly Lipp
Chief Technology Officer
www.storserver.com
719-266-8777 x7105
STORServer solves your data backup challenges.
Once and for all.


-----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 5:04 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)