<div>That's not correct. There is no risk of corruption using "sync=disabled". In the worst case you just end up with old data but no corruption. See the following comment from a master of ZFS (Aaron Toponce):<br></div><div><br></div><div><a href="https://pthree.org/2013/01/25/glusterfs-linked-list-topology/#comment-227906">https://pthree.org/2013/01/25/glusterfs-linked-list-topology/#comment-227906</a><br></div><div><br></div><div>Btw: I have enterprise SSD for my ZFS SLOG but in the case of GlusterFS I see not much improvement. The real performance improvement comes by disabling ZFS synchronous writes. I do that for all my ZFS pools/partitions which have GlutserFS on top.<br></div><div class="protonmail_signature_block-empty"><br></div><div class="protonmail_signature_block protonmail_signature_block-empty"><div class="protonmail_signature_block-user protonmail_signature_block-empty"><div><br></div></div><div class="protonmail_signature_block-proton protonmail_signature_block-empty"><br></div></div><div class="protonmail_signature_block-empty"><br></div><div><br></div><div><br></div><blockquote type="cite" class="protonmail_quote"><div>-------- Original Message --------<br></div><div>Subject: Re: [Gluster-users] Production cluster planning<br></div><div>Local Time: September 26, 2016 11:08 PM<br></div><div>UTC Time: September 26, 2016 9:08 PM<br></div><div>From: lindsay.mathieson@gmail.com<br></div><div>To: gluster-users@gluster.org<br></div><div><br></div><div>On 27/09/2016 4:13 AM, mabi wrote:<br></div><div>
> I would also say do not forget to set "sync=disabled".<br></div><div>
<br></div><div>
I wouldn't be doing that - very high risk of gluster corruption in the <br></div><div>
event of power loss or server crash. Up to 5 seconds of writes could be <br></div><div>
lost that way.<br></div><div>
<br></div><div>
<br></div><div>
If writes aren't fast enough I'd add a SSD partition for slog. <br></div><div>
Preferably a data center quality one.<br></div><div>
<br></div><div>
-- <br></div><div>
Lindsay Mathieson<br></div><div>
<br></div><div>
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