[OpenAFS] Server disk operations speed

Måns Nilsson mansaxel@besserwisser.org
Tue, 9 Apr 2013 00:41:50 +0200

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Subject: Re: [OpenAFS] Server disk operations speed Date: Mon, Apr 08, 2013=
 at 07:11:24PM +0300 Quoting jukka.tuominen@finndesign.fi (jukka.tuominen@f=
> Hi all,
> thank you for your responses. Before going through them in detail, I would
> just like to make a reality check. What kind of performance figures should
> one expect from an averagely working afs network (LAN/WAN)? Say, if you
> would duplicate roughly the 2000 files/300MB directory in your setup, what
> kind of rates do you get? That is, is 500-1000KB/s a reasonable starting
> point for optimization, not a magnitude or two higher?

GE LAN, client and server connected in same switch. 1.6.2 server, 1.4 serie=
s client.=20

Copy inside AFS, same volume, same file server.=20

$ du -sh ../infected/;  time cp -r ../infected  .=20
66M     ../infected/

real    0m17.009s
user    0m0.000s
sys     0m8.457s

3.8 MB/sec.=20

Copy out of AFS, to an iSCSI volume also on local LAN.=20

$ du -sh ../infected/;  time cp -r ../infected /scratch/mansaxel/
66M     ../infected/

real    0m0.546s
user    0m0.004s
sys     0m0.416s

Hot cache. 120+MB/sec. =20

Into AFS from local file system:=20

jaja.besserwisser.org$  time cp -r  /scratch/mansaxel/infected .

real    0m9.113s
user    0m0.000s
sys     0m9.077s

7.24 MB / sec. Also hot cache, so probably close to max for this test case.=

All of this is purely anecdotal and not very controlled environment,
but pointers to ballpark figures it is.

M=C3=A5ns Nilsson     primary/secondary/besserwisser/machina
MN-1334-RIPE                             +46 705 989668
You mean you don't want to watch WRESTLING from ATLANTA?

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