[Gluster-users] Giving up [ was: Re: read-subvolume]
landman at scalableinformatics.com
Wed Jul 10 18:51:51 UTC 2013
On 07/10/2013 02:36 PM, Joe Julian wrote:
> 1) http://www.solarflare.com makes sub microsecond latency adapters that
> can utilize a userspace driver pinned to the cpu doing the request
> eliminating a context switch
We've used open-onload in the past on Solarflare hardware. And with
Just say no. Seriously. You don't want to go there.
> 2) http://www.aristanetworks.com/en/products/7100t is a 2.5 microsecond
Neither choice will impact overall performance much for GlusterFS, even
in heavily loaded situations.
What impacts performance more than anything else is node/brick design,
implementation, and specific choices in that mix. Storage latency,
bandwidth, and overall design will be more impactful than low latency
networking. Distribution, kernel and filesystem choices (including
layout, lower level features, etc.) will matter significantly more than
low latency networking. You can completely remove the networking impact
by trying your changes out on localhost, and seeing what the impact your
design changes have.
If you don't start out with a fast box, you are not going to have fast
aggregated storage. This observation has not changed since the pre 2.0
GlusterFS days (its as true today as it was years ago).
Joseph Landman, Ph.D
Founder and CEO
Scalable Informatics, Inc.
email: landman at scalableinformatics.com
web : http://scalableinformatics.com
phone: +1 734 786 8423 x121
fax : +1 866 888 3112
cell : +1 734 612 4615
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