When Sybase always submits its buffers block aligned (same requirement as
for raw io) you can do it with a simple LD_PRELOAD hack.
I hacked sapdb (which has source available unlike sybase) to do direct IO
and it seems to not hurt at least.
> 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).
> I'd prefer O_DIRECT :-(
LVM makes raw partitions much less worse than they used to be. It is
basically a file system of raw partitions; allowing you to move and resize
them.
-Andi
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