bonomi at mail.r-bonomi.com
Sun Feb 27 21:37:17 UTC 2011
> From owner-freebsd-questions at freebsd.org Sun Feb 27 14:54:09 2011
> From: David <cyber366 at gmail.com>
> Date: Sun, 27 Feb 2011 15:46:03 -0500
> To: freebsd-questions at freebsd.org
> Subject: FreeBSD Performance
> Hello All:
> I am curious... does anyone know of a reasonably priced commodity server
> capable of sourcing/sinking 10 Gbps of data from/to disk via 2 x 10 GE
> network interfaces? Any ideas on how hard this would be to do with
> I know of a proprietary linux-based system, but looking for open-source
> FreeBSD based system.
A lot depends on what you need to do with the data.
Do you need just the 'contents' of the network packets -- i.e. are you
trying to send/recieve a single stream of data -- or do you need
complete headers, augmented with timestamps, such that you can re-
construct/replay what was 'seen on the wire'?
Is the box 'dedicated' to receiving (or sending), and does -nothing-else-
while that operation is in process? or do you need to sample the data in
real-time as well?
Another question is _how_long_ you need to handle the 2x10gbit/sec of
data. a few seconds? a few tens of seconds? minutes? hours?
If you need to 'go to disk' in real-time, you're looking at needing
at least 3-4 gigabyte/sec of bandwith to disk. No commodity drives
provide that kind of capacity, so you're looking at multiple drives
'in parallel' -- the logical equivalent of a 'striped' RAID array.
Probably 12-16 spindles paralleled. Best handled with _hardware_
raid, directly in the disk controller, but I don't know of a commodity
controller that supports enough spindles to give that bandwidth.
This means one is best off doing it in the application softwre itself,
rather than trusting the O/S to get it right.
You're also looking at a _big_ disk array. Around 200 gigs for ONE
MINUTE of data. Need 'only' an hour? That's merely 12 terabytes.
The O/S is -relatively- unimportant. <wry grin>
You need _good_ network cards, with good drivers -- preferably ones where
most of the network stack can be off-loaded onto the card itself.
You also need good disk controllers, ideally semi-autonomous (like SCSI),
with fairly large data buffers.
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