We use our DD880s as VTLs and we have 80 imaginary tape drives in each DD.  We 
get this message many times every day:
Mar 21 00:08:41 DD880 ddfs[5400]: WARNING: MSG-NFS-00006: Too many open file 
system streams. 17 files accessed in the past 30-seconds, with 0 files reopened 
for read, and 1 files reopened for write.

Support has told us that we do not have too many streams.  The stream limit is 
not a hard limit.
The message mostly occurs during migration from our disk pools, although this 
one is during the backup window.

Also a front end disk pool is a good idea if you cannot handle an hour outage 
for the code upgrades.


Andy Huebner

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Richard Rhodes
Sent: Tuesday, March 22, 2011 12:25 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] draining a diskpool when using a DD and no copypool

"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 03/22/2011
12:31:53 PM:
>
> Interesting - didn't know there was that session limit on the DD!~
> Thanks for the info!
> W
>

I misspoke . . .we have DD880's.  It's limit is 180 sessions.

The manual states the limit rather strangely . . It says:

Platform  Ram  Total  Max   Max Write    Max    Mixed
                      Write with OptDup  Read
DD880    64gb   180   180      90        50     <= 180 writes and
                                                <= 50 reads

This seems to say there is a MAX of only 50 read sessions.  In asking for
a clarification about this I was told that it's basically 180 sessions max
of any combined type, and this includes replication sessions.  It doesn't
read that way, but that's what I was told.  Oh - "OptDup" is low bandwidth
optimization for replication - something to help really, really slow
replication connections.

Rick


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