[Gluster-devel] accessing glusterfs mounted share - really slow

[Anand Avati]

So I guess, I should add a readahead and writebehind translator on
> server side?


Generally just io-threads => storage/posix, or write-behind (aggregate upto
16MB) => io-threads => stroage/posix on the server-side will do good.
io-threads is the important one on server.

io-cache can also help you as well if your I/O pattern has a lot of
re-reads.

Please use 1.3.1 tarball or the latest TLA checkout as they have quite a few
important fixes.

 avati

Regards,
>
>   Matthias
>
> > avati
> >
> > 2007/8/31, Matthias Albert <gluster at linux4experts.de
> > <mailto:gluster at linux4experts.de>>:
> >
> >     Hi Krishna,
> >
> >
> >     Krishna Srinivas schrieb:
> >     > Hi Matthias,
> >     >
> >     > If I understand correctly, for you all the operations are fine,
> but
> >     > when a "cp" is being done and simultaneously you do "ls" from
> >     > another client, the "ls" is slow?
> >     >
> >     yepp, absolutly correct. Only If I do a "cp or dd for example" the
> >     ls or
> >     tab completion is really slow and only in the glusterfs mounted
> share.
> >
> >     Matthias
> >
> >     > Krishna
> >     >
> >     > On 8/31/07, Matthias Albert <gluster at linux4experts.de
> >     <mailto:gluster at linux4experts.de>> wrote:
> >     >
> >     >> Hi all,
> >     >>
> >     >> first of all, I've to say that gluterfs is really cool and
> >     absolutly
> >     >> great. I'm not a cluster filesystem specialist but I
> >     tested/configured
> >     >> openafs and lustre and both of them are so huge and complicated.
> >     >> As I saw glusterfs and played a little bit with it, I was really
> >     >> surprised how easy it is to setup a cluster filesystem without
> >     extra
> >     >> acl's, without formatting the new filesystem without a
> >     >> metadata/objectserver :-). Thanks a lot for this.
> >     >>
> >     >> Of course I've some questions :-).
> >     >>
> >     >> I've setup 4 glusterfsd server, each of them with a storage of
> >     about
> >     >> 400-500 Gig pre-tax.
> >     >> On client side  I made different afr's over my remote volumes and
> >     >> finally a unify over the afr's. Readahead and writebehind is
> >     also enabled.
> >     >>
> >     >> Everything is working fine. I can copy "tons" of Gigabytes in my
> >     >> glusterfs without any problms and also my performance is
> >     absolutly great.
> >     >>
> >     >> But every time I start a "cp" or do a "dd test (to write some
> >     testfiles
> >     >> in the gluster storage) on some of my clients (I've 3 glusterfs
> >     clients
> >     >> one of them is a bacula server which uses the glusterfs as
> >     storage)
> >     >> all access from my glusterfs clients to the mounted share is
> really
> >     >> slow. It takes sometimes about 3-4 seconds till my ls is
> >     printing the
> >     >> output of the directory.
> >     >>
> >     >> e.g.
> >     >> ---snip---
> >     >> bash# df -h
> >     >> glusterfs             892G   84G  809G  10% /backup
> >     >>
> >     >> gsx:/backup/vmware-images # time ll
> >     >> ...
> >     >> ...
> >     >> real     0m2.863s
> >     >> user    0m0.004s
> >     >> sys     0m0.005s
> >     >> gsx:/backup/vmware-images #
> >     >> ---snap---
> >     >>
> >     >> Also the "tab completion" in the mounted glusterfs share is
> >     really slow.
> >     >> Access of not mounted glusterfs share is just normal (accessing
> >     /etc
> >     >> /usr/ /root etc. )
> >     >>
> >     >> Does anyone know these "phenomenon"?
> >     >>
> >     >> I'm using Debian as distro for all of my servers and Debian and
> >     SuSE on
> >     >> Client side.
> >     >>
> >     >> glusterfs version: glusterfs--mainline--2.5 patch-459
> >     >> fuse: fuse-2.7.0-glfs3
> >     >>
> >     >> If needed I can post my configs, strace outputs of ls -la and
> >     so on.
> >     >>
> >     >> Regards,
> >     >>
> >     >>   Matthias
> >     >>
> >     >>
> >     >>
> >     >>
> >     >>
> >     >>
> >     >>
> >     >>
> >     >>
> >     >>
> >     >>
> >     >>
> >     >> _______________________________________________
> >     >> Gluster-devel mailing list
> >     >> Gluster-devel at nongnu.org <mailto:Gluster-devel at nongnu.org>
> >     >> http://lists.nongnu.org/mailman/listinfo/gluster-devel
> >     <http://lists.nongnu.org/mailman/listinfo/gluster-devel>
> >     >>
> >     >>
> >
> >
> >
> >     _______________________________________________
> >     Gluster-devel mailing list
> >     Gluster-devel at nongnu.org <mailto:Gluster-devel at nongnu.org>
> >     http://lists.nongnu.org/mailman/listinfo/gluster-devel
> >
> >
> >
> >
> > --
> > It always takes longer than you expect, even when you take into
> > account Hofstadter's Law.
> >
> > -- Hofstadter's Law
>
>
>
> _______________________________________________
> Gluster-devel mailing list
> Gluster-devel at nongnu.org
> http://lists.nongnu.org/mailman/listinfo/gluster-devel
>



-- 
It always takes longer than you expect, even when you take into account
Hofstadter's Law.

-- Hofstadter's Law