Michael Hurst wrote:

Here is some more info:

We have 2 Antares - dual channel, SCSI-2, Ultra-3, Wide LVD Host adapters in 
the box.
They are in PCI slots, on a shared 64 bit - 33MHz bus.
Each channel goes to a separate drive with only one channel being shared with 
the robot arm.
They should run at 40MB/sec per channel to each drive so in theory we should be 
able to get 160MB/sec total to our 4 drives.
This is then limited by the drives rated at 15MB/sec native or 30MB/sec 
compressed so 60MB/sec to 120MB/sec not 40MB/sec.
We do see good performance on the drives when cloning and staging from local 
disk - about 24-28MB/sec.

We haven't tried Iperf yet as the VLAN configuration on the Sun GigaSwift NIC 
doesn't like tcpdump or other software monitoring.
That is one reason why we had to use port monitoring on the switch.
The NIC is in a PCI slot, on it's own 64 bit - 66MHz bus.
We have tried Legato's "blaster" utility from several other clients with the 
same 40MB/sec limit.

So our initial testing appears to be pointing to network but like mentioned, it 
could be a bus limit as well.
Before we dive into this to deep I was hoping to confirm that we can get over 
40MB/sec on Gb.

I did some extensive speed testing on a setup similar to this a couple
of years back. We had Seagate HVD LTO-1 drives connected via fibre and
fibre/SCSI routers. There was one drive on each SCSI drive of the
router, so two drives on each 1Gb fibre. I was using bigasm to find the
optimum number of drives to co nnect to a server. On an IBM Intel server
box with gig ethernet and W2K it topped out at about 65MB/s, so optimum
was between 2 and 3 drives. On this the CPUs were maxed out. I tried the
same hardware with Linux, found the same performance except that there
was a bit of CPU to spare. A Sun box (SBUS) showed slightly higher total
throughput, about 70MB/s IIRC.

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