`<div dir="ltr">Sorry, forget to forward to the list ...<br><br><br><div><div class="gmail_quote">---------- Forwarded message ----------<br>From: <b class="gmail_sendername">Fábio Rabelo</b> <span dir="ltr"><<a href="mailto:fabio@fabiorabelo.wiki.br">fabio@fabiorabelo.wiki.br</a>></span><br>Date: 2015-04-06 10:51 GMT-03:00<br>Subject: Re: [OmniOS-discuss] All SSD pool advice<br>To: Chris Nagele <<a href="mailto:nagele@wildbit.com">nagele@wildbit.com</a>><br><br><br><div dir="ltr"><div><div><div>I never get my hands at that 4U model ...<br><br></div>I have 2 of this babys in a customer of mine :<br><br><a href="http://www.supermicro.com/products/chassis/2U/216/SC216BA-R1K28LP.cfm" target="_blank">http://www.supermicro.com/products/chassis/2U/216/SC216BA-R1K28LP.cfm</a><br><br></div>Each one with 24 1TB Samsung 850PRO for a litle over an year, OminOS+Napp-it , no issue whatsoever ...<br><br></div><div>Expanded Chassis brings me lots and lots of headaches ...<br></div><div><br><br></div>Fábio Rabelo<br></div><div class="gmail_extra"><br><div class="gmail_quote">2015-04-06 10:41 GMT-03:00 Chris Nagele <span dir="ltr"><<a href="mailto:nagele@wildbit.com" target="_blank">nagele@wildbit.com</a>></span>:<div><div class="h5"><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Thanks everyone. Regarding the expanders, our 4U servers are on the<br>
following chassis:<br>
<br>
<a href="http://www.supermicro.com/products/chassis/4U/846/SC846E16-R1200.cfm" target="_blank">http://www.supermicro.com/products/chassis/4U/846/SC846E16-R1200.cfm</a><br>
<br>
We are using all SAS disks, except for the SSDs. How big is the risk<br>
here when it comes to SAS -> SATA conversion? Our newer servers have<br>
direct connections on each lane to the disk.<br>
<br>
Chris<br>
<br>
Chris Nagele<br>
Co-founder, Wildbit<br>
Beanstalk, Postmark, <a href="http://dploy.io" target="_blank">dploy.io</a><br>
<br>
<br>
On Sat, Apr 4, 2015 at 7:18 PM, Doug Hughes <<a href="mailto:doug@will.to" target="_blank">doug@will.to</a>> wrote:<br>
><br>
> We have a couple of machines with all SSD pool (~6-10 Samsung 850 pro is the<br>
> current favorite). They work great for IOPS. Here's my take.<br>
> 1) you don't need a dedicated zil. Just let the zpool intersperse it amongst<br>
> the existing zpool devices. They are plenty fast enough.<br>
> 2) you don't need an L2arc for the same reason. a smaller number of<br>
> dedicated devices would likely cause more of a bottleneck than serving off<br>
> the existing pool devices (unless you were to put it on one of those giant<br>
> RDRAM things or similar, but that adds a lot of expense)<br>
><br>
><br>
><br>
><br>
><br>
> On 4/4/2015 3:07 PM, Chris Nagele wrote:<br>
><br>
> We've been running a few 4U Supermicro servers using ZeusRAM for zil and<br>
> SSDs for L2. The main disks are regular 1TB SAS.<br>
><br>
> I'm considering moving to all SSD since the pricing has dropped so much.<br>
> What things should I know or do when moving to all SSD pools? I'm assuming I<br>
> don't need L2 and that I should keep the ZeusRAM. Should I only use certain<br>
> types of SSDs?<br>
><br>
> Thanks,<br>
> Chris<br>
><br>
><br>
> --<br>
><br>
> Chris Nagele<br>
> Co-founder, Wildbit<br>
> Beanstalk, Postmark, <a href="http://dploy.io" target="_blank">dploy.io</a><br>
><br>
><br>
><br>
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