On 27 mei 2010, at 01:03, Gill, Geoffrey L. wrote:

> 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.
> 

they must have a very compelling argument for wanting one huge LUN rather than 
say 6 to 12 smaller LUNs. This must have something to do with the inability to 
cut up the data.

At any rate, no matter how many or few files are on that LUN, DR within 24 
hours will only happen if they have some sort of replication. This means that 
they'll be using the backups only for the small disasters.

With tricks like 'virtualmountpount' and incremental by date you may be able to 
run the backups in a more or less timely fashion, even with large amounts of 
files. Now, if they just put on 2 huge files, that would be a challenge. Will 
they ever be 'static' long enough to stream to tape? Or in any usable state if 
you back them up using 'shared dynamic' and then need to restore?

> 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)
> 
> 

-- 

Met vriendelijke groeten/Kind regards,

Remco Post