We use multiple diskbuffers and have set the target sessions to 1 for each
device
Which forces legato to level off
As target session is not a maximum delimiter but just a optional maximum
Legato will first use disk one than disk two and then disk one again.

Just set it to 1 on both and look what happens.
In your case by putting them both on four the first disk will mostly get
four session at once.

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Davina Treiber
Sent: Monday, July 30, 2007 11:21 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Balancing use of multiple adv_file disk devices

Paul Robertson wrote:
> We're running nw_7_3_2_jumbo.Build.11 on Solaris 10.
> 
> If I create two 750GB adv_file disk device volumes and put them into the 
> same pool, is there a way to tell networker to distribute savesets 
> equally between these two volumes? At present, the first volume is 80% 
> used (as reported by "df -k"), while the second is less than 1% full. I 
> know I could have created a 1500GB volume instead of two smaller 750GB 
> volumes, but that solution doesn't scale as well.
> 
> The "Target Sessions" parameter is set to "4" on both devices; however, 
> the usage pattern is such that there will rarely be more than 4 savesets 
> being written at a time. I could reduce the target sessions for the 
> first device until the second one is equally full, but that's an awkward 
> way to control usage over time.
> 
> If an "even distribution policy" isn't possible, can I instead configure 
> a "spillover policy", where it stops writing to the first volume once it 
> reaches a certain usage level?
> 
> I took a look at the staging policy, and there are lots of knobs I can 
> tweak, but I don't think that there's anything that will let me achieve 
> the desired effect.


There is no ideal solution here, but I would start by reducing target 
sessions to 1 on both devices.

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type
"signoff networker" in the body of the email. Please write to
networker-request AT listserv.temple DOT edu if you have any problems with this
list. You can access the archives at
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the body of the email. Please write to 
networker-request AT listserv.temple DOT edu if you have any problems with this 
list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER