<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style type="text/css" style="display:none"></style> </head> <body dir="ltr" style="font-size:12pt;color:#000000;background-color:#FFFFFF;font-family:Calibri,Arial,Helvetica,sans-serif;"> <p>ok I removed some of my SLOG devices and currently I am only using a single SLOG (no mirror or anything) and no spikes seen since.</p> <p>I wonder why multiple SLOG devices would cause this.</p> <p>br.</p> <p>Rune</p> <p></p> <div style="color: rgb(0, 0, 0); font-family: Calibri,Arial,Helvetica,sans-serif; font-size: 12pt; background-color: rgb(255, 255, 255);" dir="ltr"> <hr tabindex="-1" style="width: 98%; display: inline-block;"> <div id="divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b> OmniOS-discuss <omnios-discuss-bounces@lists.omniti.com> on behalf of Rune Tipsmark <rt@steait.net><br> <b>Sent:</b> Sunday, December 14, 2014 2:27 PM<br> <b>To:</b> omnios-discuss@lists.omniti.com<br> <b>Subject:</b> [OmniOS-discuss] latency spikes ~every hour</font> <div> </div> </div> <div> <p>hi all,</p> <p> </p> <p>All my vSphere (ESXi5.1) hosts experience a big spike in latency every hour or so.</p> <p>I tested on Infiniband iSER and SRP and also 4Gbit FC and 8GBit FC. All exhibit the same behavior so I don't think its the connection that is causing this.</p> <p>When I modify the arc_shrink_shift 10 (192GB Ram in the System) it helps a bit, the spikes are still with the same regularity but latency peaks at about ~5000ms for the most part. if I leave arc_shrink_shift at the default value they can be higher - up to 15000ms.</p> <p>Looking at the latency as seen from the vSphere hosts the average is usually below 1ms for most datastores.</p> <p> </p> <p>Any ideas what can cause this or what can be done to fix?</p> <p>br,</p> <p>Rune</p> <p></p> </div> </div> </body> </html>