On 01/11/2013 08:10 AM, Andy Dills wrote:
On Fri, 11 Jan 2013, Shaun Thomas wrote:
On 01/10/2013 11:49 PM, Andy Dills wrote:
So, it seems to me that even with the no-disk-barrier and no-disk-flushes,
when I am connected, I am limited (write speed) to the speed of the
network connection.
These options are only so you're not *also* constrained by buffer flushing and
barrier operations. In the default protocol C, all writes must be synced on
both nodes before they're successful. That means your writes will be, at most,
the speed of your network interface.
We use dual 10Gb NICs on all of our servers, and bond them to separate
switches for redundancy. I didn't want to go overboard so I gave DRBD a
bandwidth limit, but I can get 350MBps from each of the 2 DRBD devices I have
set up on our servers, and have plenty left over.
I really wouldn't suggest running DRBD *without* a 10Gb NIC.
Thank you, this is what I was starting to suspect, but hadn't seen
explicitly stated anywhere.
Any positive recommendations on 10Gb NICs?
We use Intel x520 DA2 SFP+ cards and they are excellent.
Andy
---
Andy Dills
Xecunet, Inc.
www.xecu.net
301-682-9972
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Regards,
Nik
Nik Martin
nfina Technologies, Inc.
+1.251.243.0043 x1003
http://nfinausa.com
Relentless Reliability
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