Gluster users - Sep 2016 - What application workloads are too slow for you on gluster?

hi,
      I want to get a sense of the kinds of applications you tried out on
gluster but you had to find other alternatives because gluster didn't
perform well enough or the soultion would become too expensive if you move
to all SSD kind of setup.
(If you had guessed, I am trying to find what workloads tiering feature
would help in, you would be right :-) )

If you know of well known open source applications with which you saw this
problem that would be a plus! i.e. latency sensitive applications.

PS: I do know 'cp -R' of big directory hierarchies needs to be improve
in
gluster :-), we are working on it already, that feature is called -ve
lookup cache. But this post is different.

-- 
Pranith
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On Sat, Sep 24, 2016 at 07:48:53PM +0530, Pranith Kumar Karampuri
wrote:
>    hi,
>    A A A A A  I want to get a sense of the kinds of applications you tried
>    out on gluster but you had to find other alternatives because gluster
>    didn't perform well enough or the soultion would become too
expensive if
>    you move to all SSD kind of setup.
Hi,

Web Hosting is what comes to mind for me. Applications like prestashop,
wordpress,
some custom apps ... I know that I try to use DRBD as much as I can for that
since
GlusterFS makes the sites just way too slow to use, I tried both fuse and NFS
(not
ganesha since I'm on debian everytime though, don't know if that
matters).
Using things like OPCache and moving the application's cache outside of the
volume
are helping a lot but that brings a whole loads of other problems you can't
always
deal with, so most of the time I just don't use gluster for that.

Last time I really had to use gluster to host a web app I ended up installing a
VM
with a disk stored on glusterfs and configuring a simple NFS server, that was
way
faster than mounting a gluster volume directly on the web servers. At least that
proves VM hosting works pretty well now though !

Now I can't try tiering, unfortunatly I don't have the option of having
hardware for
that, but maybe that would indeed solve it if it makes looking up lots of tiny
files
quicker.

-- 
Kevin Lemonnier
PGP Fingerprint : 89A5 2283 04A0 E6E9 0111
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