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On 12/03/14 13:20, Dimitri Maziuk wrote:
> On 12/03/2014 10:11 AM, Phil Stracchino wrote:
>> If you're using any kind of modern SSD device, this is really no
>> longer much of an issue.  Between write leveling software, new
>> architectures such as Samsung's 3D VNAND, and general
>> improvements, it's really unlikely that you can actually exceed
>> the write life of a decent-size SSD device in any realistic
>> period of time.  I am advised Samsung has a 250GB 950 Pro SSD in
>> their test labs to which they have written over 8 petabytes of
>> data (yes, I said PETAbytes) and it is still going strong. 
>> Several independent test labs have test SSDs to which they have
>> been continually writing data at the maximum transfer rate of the
>> device for over a year without experiencing a failure.
> 
> Right but note there's a couple of keywords there:
> 
> "decent-size SSD device" -- don't make a 2.5TB spool partition
> because there'll be no write leveling.

Why do you assume that there would be no write leveling across a 2.5TB
spool partition?  (Which is probably going to have to be a stripe
across multiple devices in the first place.)  Write leveling in SSDs
happens far below the filesystem or RAID level.

> I think 32K write cycles is roughly a century of nightly writes so
> yeah, that should be good enough. ;)



- -- 
  Phil Stracchino
  Babylon Communications
  phils AT caerllewys DOT net
  phil AT co.ordinate DOT org
  Landline: 603.293.8485
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