<div dir="ltr"><div><div>No problems with web hosting here, including loads of busy Wordpress sites & the like. However you need to tune your filesystems correctly.<br></div>In our case, we've got webserver VMs running on top of a Gluster layer with the following configurations...<br></div><ul><li>Swap either disabled or strictly minimised with <i>vm.swappiness=10</i></li><li>All filesystems are mounted with <i>relatime</i></li><li>All logging is exported to an external server<br></li><li>Memcache on each server</li><li>nginx reverse proxy cache (Squid & Varnish'd also do the job)<br></li><li>APC PHP cache</li></ul><p>Joe's even written a <a href="https://joejulian.name/blog/optimizing-web-performance-with-glusterfs/">page</a> about optimisations.</p><p>In all, the filesystem is only touched when a user uploads a file. Everything else pretty much runs in memory.<br></p><p>This problem isn't so much Gluster's fault, as people trying to use a distributed filesystem/volume like a local disk.</p></div><div class="gmail_extra"><br><div class="gmail_quote">On 24 September 2016 at 20:36, Pranith Kumar Karampuri <span dir="ltr"><<a href="mailto:pkarampu@redhat.com" target="_blank">pkarampu@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Sat, Sep 24, 2016 at 8:59 PM, Kevin Lemonnier <span dir="ltr"><<a href="mailto:lemonnierk@ulrar.net" target="_blank">lemonnierk@ulrar.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Sat, Sep 24, 2016 at 07:48:53PM +0530, Pranith Kumar Karampuri wrote:<br>
> hi,<br>
> A A A A A I want to get a sense of the kinds of applications you tried<br>
<span>> out on gluster but you had to find other alternatives because gluster<br>
> didn't perform well enough or the soultion would become too expensive if<br>
> you move to all SSD kind of setup.<br>
<br>
</span>Hi,<br>
<br>
Web Hosting is what comes to mind for me. Applications like prestashop, wordpress,<br>
some custom apps ... I know that I try to use DRBD as much as I can for that since<br>
GlusterFS makes the sites just way too slow to use, I tried both fuse and NFS (not<br>
ganesha since I'm on debian everytime though, don't know if that matters).<br>
Using things like OPCache and moving the application's cache outside of the volume<br>
are helping a lot but that brings a whole loads of other problems you can't always<br>
deal with, so most of the time I just don't use gluster for that.<br>
<br>
Last time I really had to use gluster to host a web app I ended up installing a VM<br>
with a disk stored on glusterfs and configuring a simple NFS server, that was way<br>
faster than mounting a gluster volume directly on the web servers. At least that<br>
proves VM hosting works pretty well now though !<br>
<br>
Now I can't try tiering, unfortunatly I don't have the option of having hardware for<br>
that, but maybe that would indeed solve it if it makes looking up lots of tiny files<br>
quicker.<br></blockquote><div><br></div></span><div>I guess website hosting could be small-file workload related? Tiering may not help here until we reduce network round trips. I was wondering if anyone has any write intensive workload that gluster couldn't keep up with and they had to move to SSDs to make sure gluster works fine with it.<br></div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
<span><font color="#888888"><br>
--<br>
Kevin Lemonnier<br>
PGP Fingerprint : 89A5 2283 04A0 E6E9 0111<br>
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