[Gluster-devel] AFR write speed, ouch!

[Brent A Nelson]

I assume you're using the newly reworked AFR in the 1.4 branch?

The write-behind translator (on the client, at least) and the "o-direct 
on" option of storage/posix seem to bring speeds back to something near 
the old speeds.  When I tried, they weren't quite stable, but I haven't 
tried with the new TLAs from the last week (the last TLA I tried was when 
the dht translator was just introduced).  Last I heard, though, the new 
AFR still needs a cleanup before it's considered stable.

Thanks,

Brent Nelson
Director of Computing
Dept. of Physics
University of Florida

On Sun, 28 Sep 2008, Brandon Lamb wrote:

> I did see a post awhile back about the new AFR killing write speeds,
> any update on this?
>
> I setup a 2 server (both are server/client) and only mounted the afr
> brick on one of them and attempted to untar linux-source-2.6.26.tar...
> what took 5-9 seconds on the local disk took over 5 minutes on the afr
> mount.
>
> Are there any tricks I can employ? Is there an option to use such as
> "i dont care about autonomous locks" or something? Hm I havent tried
> WITHOUT afr, i'll go try that, but this seems kind of odd.
>
> web2:/mnt/test# time tar xf linux-source-2.6.26.tar
>
> real    0m6.393s
> user    0m0.228s
> sys     0m2.928s
> web2:/mnt/test# time tar xf linux-source-2.6.26.tar
>
> real    0m5.655s
> user    0m0.220s
> sys     0m3.836s
> web2:/mnt/test# time tar xf linux-source-2.6.26.tar
>
> real    0m9.639s
> user    0m0.284s
> sys     0m3.788s
> web2:/mnt/test# time tar xf linux-source-2.6.26.tar
>
> real    0m7.505s
> user    0m0.272s
> sys     0m3.792s
> web2:/mnt/test# time tar xf linux-source-2.6.26.tar
>
> real    0m6.865s
> user    0m0.312s
> sys     0m3.948s
> web2:/mnt/test# cd ../gfs-import/
> web2:/mnt/gfs-import# time tar xf linux-source-2.6.26.tar
>
> real    5m26.856s
> user    0m0.772s
> sys     0m3.464s
>
>
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