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

[Krishna Srinivas]

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?

Krishna

On 8/31/07, Matthias Albert <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
>
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