Messages in this thread | | | Date | Tue, 3 Jul 2001 08:10:39 -0700 | From | Daryll Strauss <> | Subject | Re: O_DIRECT please; Sybase 12.5 |
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On Tue, Jul 03, 2001 at 10:42:53AM +0100, Stephen C. Tweedie wrote: > On Fri, Jun 29, 2001 at 02:39:00AM -0700, Dan Kegel wrote: > > > It supports raw partitions, which is good; that might satisfy my > > boss (although the administration will be a pain, and I'm not > > sure whether it's really supported by Dell RAID devices). > > All block devices support raw IO --- the raw IO mechanism talks to the > device driver through the normal kernel-internal block IO entry > points. > > > I'd prefer O_DIRECT :-( > > Andrea Arcangeli has already posted patches you can try for ext2. The > functionality isn't in the mainline kernel yet, though.
I recall hearing about a problem with the md device and raw IO. It was something about the block sizes not matching causing performance problems. Has anything been done to improve those issues?
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