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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