Re: SSD Storage
- From: Niall Litchfield <niall.litchfield@xxxxxxxxx>
- To: howard.latham@xxxxxxxxx
- Date: Wed, 17 Oct 2012 13:27:04 +0100
You'll hate this..
It depends.
OK so the smart answer to my smart alec answer is "On what does it depend?"
I think there are several concerns.
- What are the current bottlenecks in the system? If they aren't
database disk I/O speeding up database disk I/O is unlikely to help.
- What's the real-life life expectancy of the kit your vendor is talking
about - IIRC for example the lifetime of exadata flash parts is 3 years,
for a write acceleration technology that probably doesn't matter, for data
storage it does.
- How does your vendor deal with the fall off in write performance over
time, i.e how do they guarantee the same performance in a year's time when
you've loaded up the flash with data? EG
http://storagemojo.com/2012/06/07/the-ssd-write-cliff-in-real-life/
- Are they selling flash or SSD, there's a difference
- If you currently use storage level snapshots/clones etc are those
features there?
Personally I was convinced enough about flash to apply for a job with
Violin (they didn't want me :) ) but that doesn't mean that flash is a
panacea, or in all cases has enterprise levels of reliability as yet - it
will shortly and many suppliers already are up to the mark.
Others on the list are better qualified than me to comment.
On Wed, Oct 17, 2012 at 12:32 PM, Howard Latham <howard.latham@xxxxxxxxx>
wrote:
> I've got a vendor going on about SSD Storage for database - Are these the
> way to go as far as performance goes?
> --
> Howard A. Latham
>
>
> --
> //www.freelists.org/webpage/oracle-l
>
>
--
Niall Litchfield
Oracle DBA
http://www.orawin.info
--
//www.freelists.org/webpage/oracle-l
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