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I ran a large at the time Informix implementation in the late 90s/early 2000s.

Raw disk vs file system (Solaris UFS) performance was 35% faster on our transaction systems.




As did I upon AIX and NCR towers. Did you find you had to offset the start block of the raw partition? As with AIX, even though the OS saw it as raw, it would stamp over the first 8k (iirc) with volume control data and with that, could easily corrupt a raw partition if you didn't factor in an offset.


I don’t recall the details, but we used Veritas Volume Manager for managing the raw disk, and I’m pretty sure vxvm either hid that or had a driver that didn’t do it.

Our restore run book was scripted and tight, so we may have been doing it ourselves, but I didn’t write the code or at least didn’t break it! Fun times.




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