Ok, after much gnashing of teeth, I've gotten transfer rates to a normal
level. It seems that "Large Send Offload" was enabled on the NICs
driver options on the mail server. I disabled this and things starting
traveling at respectable speeds.
JLC, I feel your pain. I went to connect the EMU on the MSA to the
network and realized it was dead.
I don't know how long this bottleneck has been going on. I just got
involved when I found out the person managing backups mentioned the
information store backup took 80 hours. No idea how long he had been
taking it for granted that that was normal.
Joseph L. Casale wrote:
Firstly, I will say the 6400 is slow, I had one...
Just for the fact you said 6400/msa30, I am sure your bottle neck lies there,
but if you had good hardware throughout I would have these thoughts:
1. Trunking in switches set right wrt the trunk config in the adapter team?
I've been blown away by what works (sort of) when things aren't right so it
wasn't immediately obvious...
2. Use netperf for windows to see what actual bandwidth is between the hosts?
Transferring files *does* not show this, if the target can't write as fast as
the network, or the source can't read as fast as the network, you get the
picture.
3. Maybe use IOZone or something else to gauge real disc throughput?
BTW, did this once work well? If so, I had a 6400 behind an MSA20 (An even
bigger steaming pile of sh!t) and both the 6400's battery and one of the two
bats in the chassis died without showing an error, it wasn't till I was in the
hpacucli that I caught it...
jlc
-----Original Message-----
From: Bill Humphries [mailto:nt...@hedgedigger.com]
Sent: Friday, September 03, 2010 12:35 PM
To: NT System Admin Issues
Subject: slow transfers:was MSA30 woes
Okay, this one is making my head hurt. I'm still investigating why my 500gig backup is taking 80 hours. It looks like it isn't a disk i/o problem. It looks like I have extremely slow data transfers from the mail server to the backup server. Using perfmon on both machines shows no packet loss or errors. The switches think everything is hunky-dory.
I even moved the two machines to the same physical switch and no change. While transferring a file from the mail server both NICs show 1% utilization. If I move data the other way I see 25-50% utlization and a proper transfer speed. I have stopped any antivirus services on both machines.
What gives? What else should I be looking at?
Thanks.
Bill
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