Networker

[Networker] SV: [Networker] What speed can we expect on a Gb network?

2004-05-06 10:10:00
Subject: [Networker] SV: [Networker] What speed can we expect on a Gb network?
From: Ronny Kallioniemi <Ronny.Kallioniemi AT TELIASONERA DOT COM>
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Date: Thu, 6 May 2004 15:59:48 +0200
Hello 

We are running a Legato Networker backupserver on a Sun E450 with 4x400 Mhz and 
2 Gb memory, with 9 LTO2 and 8 LTO1 Drives IBM with fiberinterface.

Thrue the E450 we get a preformence of 58-60 mb/sek when we check with iostat.


#!/bin/ksh
# Ronny Kallioniemi 20030517

iostat -x 1 20 |grep ^st > /tmp/tapespeed.tmp

TOT=0
while read file 
do
I=`echo $file | awk '{print $5}'`
TOT=`echo $TOT+$I | bc`
done < /tmp/tapespeed.tmp

MBSEC=`echo $TOT/20 | bc`
echo "$MBSEC KiloByte/Sec totalt"

 


-----Ursprungligt meddelande-----
Från: David E. Nelson [mailto:david.nelson AT ni DOT com]
Skickat: den 6 maj 2004 15:53
Till: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Ämne: Re: [Networker] What speed can we expect on a Gb network?


Hi Michael,

Sun has a free blueprints doc for maximizing Gb performance:

http://www.sun.com/blueprints/0404/817-6925.pdf

You don't specify how many SCSI busses you are using.  One experience of mine
involves two DLT 8000 on a single HVD bus (40 MB/Sec).  A single drive could
consistently write at ~12 MB/Sec.  As soon as the 2nd drive would start writing
the throughput would drop to 8 MB/Sec (25% decrease) even though the bus could
theoritically support 2 DLT-8000's.  Lesson: If you can, use as many SCSI
busses as you can.

I'm assuming that you are using the on-board 280-R Gb port so this won't apply.
But, the 1st gen of Sun Gb cards SUCKED big time (ge driver if I recall).

I ran some iperf (version 1.7.0) tests between some 280-R's (1 x 1.2 GHx x 4
GB; ce driver) on different subnets.  Out of three runs, I averaged about 260
Mb/Sec (32.5 MB/Sec - not too good).

Between a E-450 (4 x 400 Mhz x 2 GB; ce driver) and a 280-R on different
subnets I get about 255 Mb/Sec (31.8 MB/Sec - again not to hot).

Between a 480-R (4 x 1.05 GHz x 8 GB) and a 280-R on "close" but different
subnets, I get about 505 Mb/Sec (63.1 MB/Sec - fair but plenty of room to
grow).

I can't find two Gb sun hosts on the same subnet so I can't test that.

Regards,
        /\/elson

On Wed, 5 May 2004, Michael Hurst wrote:

> Hi All,
>
> We recently setup a Gb network between 4 Linux 6.1.3 clients and our Solaris
> 6.1.3 NetWorker Server. When we backup the clients to 3 LTO-1 drives we get a
> rate of 14MB/s on each drive. When we add a fourth drive to the backups, the
> rate drops to 10MB/sec on each drive.
>
> We then put a port monitor on the connection to the NetWorker Server. No
> matter how I change the number of clients, target sessions or parallelism we
> top out the connection at just over 40MB/sec.
>
> We were wondering if this is the maximum transfer rate we will see on the Gb
> interface or if we need to tune tcpip. Is anyone seeing better speeds on the
> Gb NIC to their NetWorker Servers?
>
> Note: NetWorker Server is a Sun Fire 280-R with dual 700Mhz CPUs and 1.5GB of
> RAM. Still shows lots of CPU and memory available during the backups.

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