[OmniOS-discuss] Fwd: All SSD pool advice

[Schweiss, Chip]

On Mon, Apr 6, 2015 at 8:53 AM, Fábio Rabelo <fabio at fabiorabelo.wiki.br>
wrote:

> 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  ...
>

The system I've built with interposers has SAS expanders and gives me no
problems.  Samsung SSDs are the only SSD I've found that works well with
the interposer.

-Chip

>
>
> 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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