On 07/22/2013 03:30 PM, Миша Тюрин wrote: > > i tell about wal_level is higher than MINIMAL
OK, so you want to be able to force O_DIRECT for wal_level = archive ? I guess that makes sense if you expect the archive_command to read the file out of the RAID controller's write cache before it gets flushed and your archive_command can also use direct I/O to avoid pulling it into cache. You already know where to change to start experimenting with this. What exactly are you trying to ask? I don't see any risk in forcing O_DIRECT for higher wal_level, but I'm not an expert in WAL and recovery. I'd recommend testing on a non-critical PostgreSQL instance. -- Craig Ringer http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
