[OmniOS-discuss] All SSD pool advice

[Chris Nagele]

Thanks everyone. Regarding the expanders, our 4U servers are on the
following chassis:

http://www.supermicro.com/products/chassis/4U/846/SC846E16-R1200.cfm

We are using all SAS disks, except for the SSDs. How big is the risk
here when it comes to SAS -> SATA conversion? Our newer servers have
direct connections on each lane to the disk.

Chris

Chris Nagele
Co-founder, Wildbit
Beanstalk, Postmark, dploy.io


On Sat, Apr 4, 2015 at 7:18 PM, Doug Hughes <doug at will.to> wrote:
>
> We have a couple of machines with all SSD pool (~6-10 Samsung 850 pro is the
> current favorite). They work great for IOPS. Here's my take.
> 1) you don't need a dedicated zil. Just let the zpool intersperse it amongst
> the existing zpool devices. They are plenty fast enough.
> 2) you don't need an L2arc for the same reason. a smaller number of
> dedicated devices would likely cause more of a bottleneck than serving off
> the existing pool devices (unless you were to put it on one of those giant
> RDRAM things or similar, but that adds a lot of expense)
>
>
>
>
>
> On 4/4/2015 3:07 PM, Chris Nagele wrote:
>
> We've been running a few 4U Supermicro servers using ZeusRAM for zil and
> SSDs for L2. The main disks are regular 1TB SAS.
>
> 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?
>
> Thanks,
> Chris
>
>
> --
>
> Chris Nagele
> Co-founder, Wildbit
> Beanstalk, Postmark, dploy.io
>
>
>
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