NOW: o_direct -- WAS: Re: WARNING in xfs_lwr.c, xfs_write()

Thu May 27 09:57:14 CDT 2010

On Thu, May 27, 2010 at 11:58:55PM +1000, Stewart Smith wrote:
> There is O_DIRECT type functionality available on Windows, with similar
> restrictions for aligned IO too. You have to use the Win32 APIs to do it
> though, the POSIX ones won't get you it (or more than 2048 files open at
> once).
> 
> In practice we've only ever found Solaris (other than linux) to be
> reliable with O_DIRECT (at least on UFS... ZFS is... well... I wouldn't
> run a database server on it yet).

Solaris doesn't support O_DIRECT either, it instead has a separate
directio call - just another pointless difference.