On Wed, 26 Aug 1998, Ronny Svedman wrote:

> On Tue, 25 Aug 1998, Jim Bender wrote:
> > Then why were they so damn slow even when connected to a "fast" VAX on a 
> > fast HSC or even a high end SDI controller?    So slow we were wishing we
> > had our Massbuss disks back.    :-(
> 
> RA disks are big and heavy, which implies they seek rather slowly. but if
> you want to load a BIG file, thats not too fragmented they give very good
> performance. 
> 
> Atleast this is what we are experiencing here at update, running over 40
> RA-90's 91's and 92's, from three HSC-90s on CI bus on a VAX 6440...

Ahem. We have two HSC-90, and the bottleneck really is the requestors 
here. Too many disks doing stuff in paralell. When the 6440 needs to fsck
the stuff after a crash, it takes close to an hour...
(But then again, Ultrix is pretty brain-damaged itself too...)
The HSC-90s are loaded, but the requestors get stuffed waiting for the
disks. Each have atleast three disks on 'em.

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt@update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol