cgh018@tijc02.UUCP (Calvin Hayden ) (08/16/89)
Any one out there who can tell me the optimal
rotational gap, and blocks/cylinder for a DEC
RA90 Drive? I don't know how much difference it
will make using the opt. over what I've got now,
but its worth a shot. I'm running SysV R2 V2 on
a Vax 8600 - maybe some ultrix person can tell
me the answer, because DEC hasn't been too helpful
on this one.
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\__\alan@shodha.dec.com ( Alan's Home for Wayward Notes File.) (08/16/89)
In article <618@tijc02.UUCP>, cgh018@tijc02.UUCP (Calvin Hayden ) writes: > Any one out there who can tell me the optimal > rotational gap, and blocks/cylinder for a DEC > RA90 Drive? I use an 8 KB block size on my RA90's and the file system code uses an 8 KB gap. I've played around with smaller (0) and larger gaps without much change in sequential I/O speed. I haven't tried other block sizes. From the V3.1 disktab entry for the RA90: ra90|RA90|DEC RA90 Winchester:\ :ty=winchester:ns#69:nt#13:nc#2649:\ :pa#15884:ba#8192:fa#1024:\ :pb#127072:bb#4096:fb#1024:\ :pc#2376153:bc#8192:fc#1024:\ :pd#420197:bd#8192:fd#1024:\ :pe#420197:be#8192:fe#1024:\ :pf#840393:bf#8192:ff#1024:\ :pg#1680787:bg#8192:fg#1024:\ :ph#552410:bh#8192:fh#1024: Sectors per track is 69, tracks per cylinder is 13 and there are 2649 cylinders. -- Alan Rollow alan%nabeth.dec.com@decwrl.dec.com