Riaan,
        That's interesting, do you think that there may be a compromise
between the two? What size of volumes did you use? Do you think that I'd
suffer the same problems with a volume size of 1TB (and, maybe, a high
water mark of 90% for the staging)?

        This is good stuff, might even save me from making avoidable
mistakes when I set up a similar system next month. Any and all feedback
is valued. Thanks.

Regards
Bob

-----Original Message-----
From: Riaan Louwrens [mailto:riaanl AT sourceconsulting.co DOT za] 
Sent: 28 October 2003 10:27
To: 'Legato NetWorker discussion'; 'Wood, R A (Bob)'
Subject: RE: [Networker] legato "staging" info


At first glance one would think this a good idea - but - we have found
that the adv_file type device just "pauses" when it runs out of space
(we have a nexsan box which I chopped into numerous volumes). 

So it shot our idea of having multiple disk devices apart a bit. 

I am now back to using "one" device - with parallelism (we get the same
effective througput) on one LARGE filesystem (we do have another device
which we use for monthly backups).

So in essence - we dont stage (to difficult & cumbersome to implement) -
we will clone and then run scripts to delete the old savesets (which we
havent got yet).. (See earlier reply from Shawn Cox on the same topic).
T'would be nice if Shawn shared the scripts <hint hint>.

Regards,

Riaan
-----Original Message-----
From: Wood, R A (Bob) [mailto:WoodR AT CHEVRONTEXACO DOT COM]
Sent: Tuesday, October 28, 2003 11:51 AM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] legato "staging" info


Paul

I'd have thought that there are ways to make the system use more than
one tape at a time. On 6.1.3 I was using a couple of disk devices and
had two staging processes, occasionally they would both run at the same
time, worked a treat. OK, so the disk devices (well, file devices
actually) were fairly small, but it still worked fine.

What about if you set up as many adv.disk devices as the number of tape
drives you want to use at one time. You could backup across the whole
set and have multiple staging processes to move from disk to tape.

Regards
Bob



-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTMAIL.TEMPLE DOT EDU]
On Behalf Of Paul Steele
Sent: 27 October 2003 23:39
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] legato "staging" info


On 27 Oct 2003 at 18:19, Evan Gold wrote:

> I rebuilding my legato 7 server and was considering using disk
> staging, has anyone used this? is it worth it?
>
> I backup about 2TB a week, how much space do i need for staging to
> work? Is 100gb disk space too small?
>
> how much will this speed up my backups and clones?
>
> is this a substitute for buying more tape drives?

We looked into this as well and decided not to persue it at this time.
Apparently it's difficult to make the disk-to-tape step of the staging
process to use more than one tape drive...

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