Hi,
Em 01-06-2010 08:16, Robert Dunkley escreveu:
Hi Igor,
SDP performance can be measured with the Qperf utility included with
the OFED drivers/utilities. I was testing with single port 3^rd Gen
(Same series as the ones you link) Mellanox DDR (20/16Gbit) cards on
Opterons 2 years ago and was getting 11Gbit/sec. The newer 4^th gen
ConnectX mellanox cards will achieve 13-14Gbit/sec in DDR so if you
are buying new get ConnectX.
I understand what you are trying to tell, but ConnectX it's so much
expensive then the one I mention and the bandwith provided in Mellanox
MHES14-xtc will be more then enought for our setup's.
For comparison in datagram mode I was getting 3.2Gbit/sec and in
connected mode with a 32Kb MTU in connected mode I was getting
7Gbit/sec. This was 2 years ago so new version of OFED may well have
improved performance.
I will have to try myself, I do not know the technology. I'm just trying
to make sure I will not buy anything that don't work out and stuck with
the cards in the closet.
Thanks very much for your help.
Hope this helps,
Rob
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *Igor Neves
*Sent:* 31 May 2010 14:33
*To:* Michael Iverson
*Cc:* [email protected]
*Subject:* Re: [DRBD-user] Infiniband card support and help
Hi,
On 05/31/2010 12:45 PM, Michael Iverson wrote:
Igor,
I'm basically doing the same thing, only with MHEA28-XTC cards. I
wouldn't think you'll have any problems creating a similar setup with
the MHES cards.
I've not attempted to use infiniband sdr, just ipoib. I am running
opensm on one of the nodes. I'm getting throughput numbers like this:
Would be very nice if you could test your setup with drbd infiniband
sdr support, probably you will not need to re-sync anything.
cirrus:~$ netperf -H stratus-ib
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
stratus-ib.focus1.com <http://stratus-ib.focus1.com> (172.16.24.1)
port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.00 7861.61
Nice.
A couple of things to watch out for:
1. Upgrade the firmware on the cards to the latest and greatest
version. I saw about a 25% increase in throughput as a result. The
firmware updater was a pain to compile, but that was mostly due to
Ubuntu's fairly rigid default compiler flags.
Will watch that!
2. Run the cards in connected mode, rather than datagram mode, and put
the MTU at the max value of 65520. My performance benchmarks of drbd
show that this is the best setup.
If I use infiniband sdr support from drbd, should I care about MTU?
The replication rate on my setup is completely limited by the
bandwidth of my disk subsystem, which is about 200 MB/s for writes. I
can share some performance comparisons between this and bonded gigabit
ethernet, if you would like. However, I won't be able to provide it
until tomorrow, as it is a holiday in the US today, and I don't have
ready access to the data.
We have a couple of setups that have I/O performances greater than
500MB/sec, so we really need 10Gbit trunks.
Thanks for the help, but I don't need performance results from Gbit
setup's, we have a couple, and we know the problems! :) Anyway if you
want to paste it here, I guess no one will complain.
On Mon, May 31, 2010 at 6:17 AM, Igor Neves <[email protected]
<mailto:[email protected]>> wrote:
Hi,
I'm looking for a 10Gbit backend for storage drbd replication. I'm
expecting to setup infiniband solution connected back to back, this
means both nodes will be connected together without a switch.
I wonder if I bought two of this cards MHES14-xtc and a cable, I will
be able to produce such setup?
Link to the cards:
http://www.mellanox.com/content/pages.php?pg=products_dyn&product_family=19&menu_section=41
<http://www.mellanox.com/content/pages.php?pg=products_dyn&product_family=19&menu_section=41>
Another question, I intend to use this with infiniband sdr support
added to drbd in 8.3.3, and I found this on the spec's of the card.
"In addition, the card includes internal Subnet Management Agent (SMA)
and General Service Agents, eliminating the requirement for an
external management agent CPU."
This means I don't need to run openSM in any nodes? I will just need
to setup two cards, a cable, connect them, and setup IPoIB to start
replicating in 10Gbit?
Thanks very much,
Thanks, once again.
--
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3GNTW - Tecnologias de Informação, Lda
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Igor Neves<[email protected]>
3GNTW - Tecnologias de Informação, Lda
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