On 11/24/2015 10:48 AM, Marcin Mańk wrote:
I saw this:
http://blog.pgaddict.com/posts/postgresql-on-ssd-4kb-or-8kB-pages
It made me wonder: if SSDs have 4kB/8kB sectors, and we'd make the
Postgres page size equal to the SSD page size, do we still need
full_page_writes?
an SSD's actual write block is much much larger than that. they
emulate 512 or 4k sectors, but they are not actually written in sector
order, rather new writes are accumulated in a buffer on the drive, then
written out to a whole block, and a sector mapping table is maintained
by the drive.
--
john r pierce, recycling bits in santa cruz
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