[OmniOS-discuss] Fwd: All SSD pool advice

[Nate Smith]

You also have to consider your use cases: High read low write environments, versus mixed loads, versus high write environments. SSD vendors are designing enterprise drives with those use cases in mind. High read environments will not have nearly the write endurance. (Intel S3500s seem designed for low write endurance environments). And yes, as Gea said, you need to have built in capacitors in enterprise SSDs for power protection. 
 
Agree with Gea on the Intel S3500 and S3700 series. They´re good, but the write endurance is much lower on S3500. I´ve been using the Samsung datacenter series because of the price.
 
http://www.samsung.com/global/business/semiconductor/product/flash-ssd/overview
 
Also, no SAS expanders and SATA are a no-no. SAS SSDs are much more expensive and harder to find. There are decently priced enterprise level SATA SSDs. Plan your infrastructure accordingly. 
 
 
-Nate
 
From: OmniOS-discuss [mailto:omnios-discuss-bounces at lists.omniti.com] On Behalf Of Günther Alka
Sent: Saturday, April 04, 2015 5:34 PM
To: omnios-discuss at lists.omniti.com
Subject: [OmniOS-discuss] Fwd: All SSD pool advice
 
SSD only pools can give you a similar sequential performance like good SAS disks but while oops of a regular disk is a few hundreds, a SSD is at a few thousands so there may be a huge improvement with iops sensitive use cases.
 
With ZeusRam and SAS disks, it seems a production machine.
For SSD only I would consider
 
- with an expander stay with SAS, without expander Sata is much cheaper
- prefer enterprise SSDs with powerless protection and a build in over provisioning
like Intel series 3500 - 3700 and newer
 
Desktop SSDs come without over provisioning (you may add your own) but without powerless protection (okay, your SAS disks does no have as well)
 
- as SSDs have that many iops, you may use Raid-Z (1-3) instead of multiple mirrors (reduce cost)
 
- a L2Arc is not needed but a ZeusRAM as dedicated ZIL makes a lot of sense as it is much faster than your SSD pool (and you do not need to write data twice (sync log and cached write) to your pool
 
 
Gea
 
 
 
 
Am 04.04.2015 um 21:07 schrieb Chris Nagele <nagele at wildbit.com>:
 
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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