Re: [Bulk] Re: SSD performance article

Hi, Larry:

NAND Flash memory technology definitely has its limitations.

There are some new developments on the horizon that may completely change the nature of these devices and "storage" in general -- see:

http://www.bbc.com/news/technology-33675734

Once this technology becomes widely available it will potentially change everything -- a true "game changer" for the whole industry.

All the best,

Mark S. Waterbury

> On 8/4/2015 9:51 AM, DrFranken wrote:

On 8/4/2015 9:33 AM, Steinmetz, Paul wrote:

So does this mean the SSD will eventually "wear out"?

Yes! In fact it's inevitable. Write enough times and they are worn out.

So what would be the normal life expectancy for a SSD, 3, 5, 10 years?

It depends! How often does YOUR app write to them? Now understand that all SSD's and IBM's in particular have logic to know when areas are getting 'worn' and move data from them. They also have significant 'overcapacity' so for example the original 70GB SSDs that IBM shipped (and were an industry first!) actually were 128GB raw capacity. This was specifically to leave significant remap space for warn areas.

Could this be why there is a high maintenance charge on SSD, spinny had no maintenance?

Precisely that plus the obvious high cost of them in general. IBM could have raised maintenance rates per 'disk slot' to cover this but that penalizes the guy who is not using them and subsidizes the guys that are. So the charge was instituted.

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.> Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Charles Wilt
Sent: Monday, August 03, 2015 4:47 PM
To: Midrange Systems Technical Discussion
Subject: Re: SSD performance article

Interesting read...

I wonder how/if the same issues apply to IBM i with its SLS.

Given that SLS treats disk more like memory...it would seem that SSDs would be even better suited to SLS than spinies.

Charles

On Mon, Aug 3, 2015 at 3:40 PM, John McKee <jmmckee3@xxxxxxxxx> wrote:

Thought this was interesting.

http://www.zdnet.com/article/the-case-against-ssds/


John McKee