On 05/05/2015 11:05 PM, ToddAndMargo wrote:
On 04/14/2015 02:29 AM, Vladimir Mosgalin wrote:
Hi ToddAndMargo!
On 2015.04.13 at 18:26:49 -0700, ToddAndMargo wrote next:
-T
Wonder if there are any enterprise level SSD's that don't
need TRIM?
Tons. All Hitachi SSDs, OCZ Interpid and Saber, all Intel DC series SSDs
(based on Intel controllers) and many more. Though I'm not sure that
1) you'll like the prices of enteprise SSDs and 2) for workstation (and
even for many kinds of servers) there is absolutely no point in using
these "enterprise" SSDs. The controller itself isn't more reliable, just
flash chips endure more wear, but the difference (e.g. 100 TB endurance
of normal SSD vs 20 PB endurance of enterprise SSD) makes a difference
only for certain databases and cache (when data on SSD is constantly
refreshed) workloads. So if you exclude the wear factor, the chance of
failure depends on the controller/firmware and is about the same whether
SSD was marked for enterprise or not. And you already got RAID in mind
against these kind of failures anyway.
For nearly all other cases, avoiding SandForce-based SSDs is about all
you
need to care about when picking SSD for systems without TRIM. I listed
some model examples in the previous mail.
Hi Vladimir,
I have look all over Intel's specs for their new SSD DC S3510
series SSDs (older drives are harder to find):
http://www.intel.com/content/www/us/en/solid-state-drives/ssd-dc-s3510-spec.html
They do not say a thing about Garbage Collection and not having to use
TRIM. They do say "Data set management Trim command", which means they
support TRIM.
I have eMailed Intel's tech support twice over two weeks and
have been ignored twice by them (which is typical).
Also: in my research, I did find mention that TRIM did not effect
lifespan -- TRIM only affected write speed, which would slow down
to a crawl without it. Can you verify this?
Thank you for helping me with this.
-T
Found this:
http://www.intel.ie/content/dam/www/public/us/en/documents/white-papers/ssd-dc-s3500-workload-raid-paper.pdf
The system used for RAID 1 testing include the following:
• LSI MegaRAID 9265-8i* controller card
To summarize:
• In both RAID 1 and RAID 5, the Intel SSD DC S3500 Series
drive shows excellent scalability, performance, and consistency.
• Very little latency was introduced by the RAID controller
in RAID 1. In RAID 5, the overhead and latency are slightly
higher.
• In random, mixed read/write workloads, SSDs perform
significantly (as much as 100 times) better than HDDs
in a similar situation
Maybe the S3500 is what I want? They are still available
at my distributors.
-T
--
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They malfunction when you open windows
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