On Sat, May 13, 2006 at 08:23:55AM +0200, Franz Haberhauer wrote: > Given that ISV apps can be only changed by the ISV who may or may not be > willing to > use such a new interface, having a "no cache" property for the file - or > given that filesystems > are now really cheap with ZFS - for the filesystem would be important > as well, > like the forcedirectio mount option for UFS. > No caching at the filesystem level is always appropriate if the > application itself > maintains a buffer of application data and does their own application > specific buffer management > like DBMSes or large matrix solvers. Double caching these typicaly huge > amounts data > in the filesystem is always a waste of RAM.
Yes, but remember, DB vendors have adopted new features before -- they want to have the fastest DB. Same with open source web servers. So I'm a bit optimistic. Also, an LD_PRELOAD library could be provided to enable direct I/O as necessary. Nico -- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
