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 <http://wildbit.com/>
Beanstalk <http://beanstalkapp.com/>, Postmark
<http://postmarkapp.com/>, dploy.io <http://dploy.io/>
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