[OmniOS-discuss] Fwd: All SSD pool advice

[Fábio Rabelo]

Sorry, forget to forward to the list ...


---------- Forwarded message ----------
From: Fábio Rabelo <fabio at fabiorabelo.wiki.br>
Date: 2015-04-06 10:51 GMT-03:00
Subject: Re: [OmniOS-discuss] All SSD pool advice
To: Chris Nagele <nagele at wildbit.com>


I never get my hands at that 4U model ...

I have 2 of this babys in a customer of mine :

http://www.supermicro.com/products/chassis/2U/216/SC216BA-R1K28LP.cfm

Each one with 24 1TB Samsung 850PRO for a litle over an year,
OminOS+Napp-it , no issue whatsoever ...

Expanded Chassis brings me lots and lots of headaches  ...


Fábio Rabelo

2015-04-06 10:41 GMT-03:00 Chris Nagele <nagele at wildbit.com>:

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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> >
> >
> >
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