<div dir="ltr"><p class="MsoNormal">I thought I might take a minute to update everyone on this
situation. I rebuilt the glusterFS using
a shard size of 256MB and then imported all VMs back on to the cluster. I rebuilt it from scratch rather than just
doing an export/import on the data so I could start everything fresh. I wish now I would have used 512MB but
unfortunately I didn’t see that suggestion in time. Anyway, the
good news is the system load has greatly decreased. The systems are all now in a usable state.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The bad news is that I am still seeing a bunch of heals and
not sure why. Because of that, I am also
still seeing the drives slow down from over 110 MB/sec without Gluster running on
them to ~ 25 MB/sec with bricks running on the drives. So it seems to me there is still an issue
here.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Also as fate would have it, I am having issues due to a bug
in the Gluster NFS implementation on this version (3.7) that necessitates the
need to set nfs.acl to off so also hoping for a fix for that soon. I think this is the bug but not sure: <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1238318">https://bugzilla.redhat.com/show_bug.cgi?id=1238318</a></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">So to sum up, things are working but the performance leaves
much to be desired due mostly I suspect due to all the heals taking place.</p><p class="MsoNormal"><br></p><p class="MsoNormal">- Kyle</p><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 11, 2016 at 9:32 PM, 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 class="HOEnZb"><div class="h5"><br>
<br>
On 01/12/2016 08:52 AM, Lindsay Mathieson wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 11/01/16 15:37, Krutika Dhananjay wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Kyle,<br>
<br>
Based on the testing we have done from our end, we've found that 512MB is a good number that is neither too big nor too small,<br>
and provides good performance both on the IO side and with respect to self-heal.<br>
</blockquote>
<br>
<br>
Hi Krutika, I experimented a lot with different chunk sizes, didn't find all that much difference between 4MB and 1GB<br>
<br>
But benchmarks are tricky things - I used Crystal Diskmark inside a VM, which is probably not the best assessment. And two of the bricks on my replica 3 are very slow, just test drives, not production. So I guess that would effevt things :)<br>
<br>
These are my current setting - what do you use?<br>
<br>
Volume Name: datastore1<br>
Type: Replicate<br>
Volume ID: 1261175d-64e1-48b1-9158-c32802cc09f0<br>
Status: Started<br>
Number of Bricks: 1 x 3 = 3<br>
Transport-type: tcp<br>
Bricks:<br>
Brick1: vnb.proxmox.softlog:/vmdata/datastore1<br>
Brick2: vng.proxmox.softlog:/vmdata/datastore1<br>
Brick3: vna.proxmox.softlog:/vmdata/datastore1<br>
Options Reconfigured:<br>
network.remote-dio: enable<br>
cluster.eager-lock: enable<br>
performance.io-cache: off<br>
performance.read-ahead: off<br>
performance.quick-read: off<br>
performance.stat-prefetch: off<br>
performance.strict-write-ordering: on<br>
performance.write-behind: off<br>
nfs.enable-ino32: off<br>
nfs.addr-namelookup: off<br>
nfs.disable: on<br>
performance.cache-refresh-timeout: 4<br>
performance.io-thread-count: 32<br>
cluster.server-quorum-type: server<br>
cluster.quorum-type: auto<br>
client.event-threads: 4<br>
server.event-threads: 4<br>
cluster.self-heal-window-size: 256<br>
features.shard-block-size: 512MB<br>
features.shard: on<br>
performance.readdir-ahead: off<br>
<br>
<br>
</blockquote></div></div>
Most of these tests are done by Paul Cuzner (CCed).<span class="HOEnZb"><font color="#888888"><br>
<br>
Pranith<br>
</font></span></blockquote></div><br><div class="gmail_signature"><div dir="ltr"><div><div><br></div></div></div></div>
</div></div>