<div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Feb 15, 2017 at 9:38 PM, Gambit15 <span dir="ltr"><<a href="mailto:dougti+gluster@gmail.com" target="_blank">dougti+gluster@gmail.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"><div class="gmail_quote"><div dir="ltr"><div><div><div><div>Hey guys,<br></div> I keep seeing different recommendations for the best shard sizes for VM images, from 64MB to 512MB.<br><br></div>What's the benefit of smaller v larger shards?<br></div>I'm guessing smaller shards are quicker to heal, but larger shards will provide better sequential I/O for single clients? Anything else?<br></div></div></div></div></blockquote><div><br></div><div>That's the main difference. And also smaller shards provide better brick utilization and distribution of IO in distributed-replicated volumes as opposed to larger shards. <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div><br></div>I also usually see "cluster.data-self-heal-algori<wbr>thm: full" is generally recommended in these cases. Why not "diff"? Is it simply to reduce CPU load when there's plenty of excess network capacity?<br clear="all"></div></div></div></blockquote><div><br></div><div>That's correct. diff heal requires rolling checksum to be computed for every 128KB chunk of the file on both source and sink bricks, which is CPU intensive, potentially affecting IO traffic.<br></div><div><br></div><div>-Krutika<br> <br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_quote"><div dir="ltr"><div><div><div><div><div><br></div><div>Thanks in advance,<br></div><div>Doug<span class="m_5551277519050561646HOEnZb"></span><br></div></div></div></div></div></div></div></div>
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