<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div><div class="">SSD only pools can give you a similar sequential performance like good SAS disks but while oops of a regular disk is a few hundreds, a SSD is at a few thousands so there may be a huge improvement with iops sensitive use cases.</div><div class=""><br class=""></div><div class="">With ZeusRam and SAS disks, it seems a production machine.</div><div class="">For SSD only I would consider</div><div class=""><br class=""></div><div class="">- with an expander stay with SAS, without expander Sata is much cheaper</div><div class="">- prefer enterprise SSDs with powerless protection and a build in over provisioning</div><div class="">like Intel series 3500 - 3700 and newer</div><div class=""><br class=""></div><div class="">Desktop SSDs come without over provisioning (you may add your own) but without powerless protection (okay, your SAS disks does no have as well)</div><div class=""><br class=""></div><div class="">- as SSDs have that many iops, you may use Raid-Z (1-3) instead of multiple mirrors (reduce cost)</div><div class=""><br class=""></div><div class="">- a L2Arc is not needed but a ZeusRAM as dedicated ZIL makes a lot of sense as it is much faster than your SSD pool (and you do not need to write data twice (sync log and cached write) to your pool</div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Gea</div><div class=""><br class=""></div><blockquote type="cite" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div class=""><br class=""></div><br class=""><div class=""><blockquote type="cite" class=""><div class="">Am 04.04.2015 um 21:07 schrieb Chris Nagele <<a href="mailto:nagele@wildbit.com" class="">nagele@wildbit.com</a>>:</div><br class="Apple-interchange-newline"><div class=""><font class=""><span style="background-color:rgba(255,255,255,0)" class="">We've been running a few 4U Supermicro servers using ZeusRAM for zil and SSDs for L2. The main disks are regular 1TB SAS. <br class=""><br class=""></span></font><div class=""><font class=""><span style="background-color:rgba(255,255,255,0)" class="">I'm considering moving to all SSD since the pricing has dropped so much. What things should I know or do when moving to all SSD pools? I'm assuming I don't need L2 and that I should keep the ZeusRAM. Should I only use certain types of SSDs? </span></font></div><div class=""><font class=""><span style="background-color:rgba(255,255,255,0)" class=""><br class=""></span></font></div><div class=""><font class=""><span style="background-color:rgba(255,255,255,0)" class="">Thanks,</span></font></div><div class=""><font class=""><span style="background-color:rgba(255,255,255,0)" class="">Chris</span></font></div>
<br class=""><br class="">-- <br class=""><div dir="ltr" class=""><div class=""><br class=""></div><div class=""><font class="">Chris Nagele</font></div><div class=""><font class="">Co-founder,</font><font color="#888888" class=""> </font><font class=""><a href="http://wildbit.com/" style="color:rgb(17,85,204)" target="_blank" class="">Wildbit</a></font></div><div class=""><div style="color:rgb(136,136,136)" class=""><a href="http://beanstalkapp.com/" style="color:rgb(17,85,204)" target="_blank" class="">Beanstalk</a>, <a href="http://postmarkapp.com/" style="color:rgb(17,85,204)" target="_blank" class="">Postmark</a>, <a href="http://dploy.io/" style="color:rgb(17,85,204)" target="_blank" class="">dploy.io</a></div></div></div><br class="">
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