Unfortunately, the new LTO-3 Drives aren't here yet, I'm stuck with 8 x
SDLT-220 drives, which can only write 22MB/sec (real world, that's
around 18MB/sec.)  So the only storage unit I can write to that allows
me to test for high speed is disk, which is why the disk buffers
settings.  Basically, I'm trying to prove that I can move data across
the wire with our current infrastructure at 45MB/sec+ so I'll have less
to worry about when the LTO-3s actually get here.
 
Thanks for the note though!
 
-J

________________________________

From: Dean [mailto:dean.deano at gmail.com] 
Sent: Sunday, August 27, 2006 9:45 PM
To: Martin, Jonathan (Contractor)
Cc: veritas-bu at mailman.eng.auburn.edu
Subject: Re: [Veritas-bu] Maximzing Gigabit Performance


Jonathon,
 
You do realise that SIZE_DATA_BUFFERS_DISK and NUMBER_DATA_BUFFERS_DISK
only apply to disk storage units?
The settings that apply to tape are SIZE_DATA_BUFFERS and
NUMBER_DATA_BUFFERS.
 
Look in your bptm logs for "waited for xxxxx buffer". 
If xxxxx = "full", then it means the bottleneck is getting data into the
media server from the network. 
If xxxxx = "empty", it means the bottleneck is the write operation (be
it to tape or disk)
 
Regards
Dean
 
On 8/26/06, Martin, Jonathan (Contractor) <JMARTI05 at intersil.com> wrote:


        All, we're tying to maximize our throughput across gigabit
Ethernet and playing with the buffers etc to try and get faster numbers.
         
Client Buffer   NET_BUFFER_SIZE         NUMBER_DATA_BUFFERS_DISK
SIZE_DATA_BUFFERS_DISK  KB/sec  
256      262144  ---     ---     34000  
256      2097152         ---     ---     39500  
256      2097152         16      ---     37000  
256      2097152         16      262144  36000  
512      2097152         64      262144  40480  
1024     2097152         64      262144  37608  
1024     4194304         64      262144  37473  
         
         
        Netbackup 5.1 Client --> Gigabit Copper --> Cisco Switch -->
Gigabit Fiber --> Media Server --> Direct Attached SCSI 320 Drive
         
        Here's the results of some testing from this morning on one of
my fastest servers (as far as disk/processor/memory) are concerned.  It
looks like my "sweet spot" is about 40MB/sec through Netbackup.  If I
try and FTP several files directly from this server to the Media Server
via the same network config to disk I can get close to 60MB/sec.  Am I
missing some setting here?  Why can't I get even close to duplicating
the 60MB/sec I get via FTP?  My perfmon shows the server's nic only
pushing 45MB/sec or less with drops in communication every 10 seconds or
so.  I'm missing something, any ideas? 
         
        -Jonathan

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