On 08/03/2012 02:04 PM, Pierre Abbat wrote:
I don't see why you can't, or shouldn't, dedup an SSD. Deduping looks
for identical sectors and frees one of them; since an SSD is
completely random-access, there's no penalty for having some sectors
far from the file's inode. Recopying an SSD is what makes no sense.
I'm just following Matt's advice here. But it has to do with reducing
the amount of write operations on the ssd. The more succesful the
deduping is, the more write operations it will take, and the quicker the
ssd will wear out, I guess. But I really have no idea of the amount of
operations that are in play here and what the relative increase in write
ops is when you turn dedup on. It would be interesting to test/diagnose.
If there's, say, only a 5% percent increase in write ops when you turn
on dedup, then its benefits could be interesting enough to turn it on,
because it could also leave you with extra room on the ssd to compensate
for the total wear.
Cheers,
Jelle
