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-boun...@lists.omniti.com] On Behalf
Of Günther Alka
Sent: Saturday, April 04, 2015 5:34 PM
To: omnios-discuss@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 <nag...@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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