Re: sharing SCSI disks

Simon Janes (sjanes@telum.abies.com)
Thu, 20 Mar 1997 08:19:05 -0500


> This just boggles my mind. If I'm considering the inferences
> correctly, for short distances if you need far faster than 100
> megabit netcards between a couple of boxes then you can use a
> few scsi host adapters? Perhaps a couple in each box and load
> balance them with the eql driver?

Might be possible, but I've had reports of slaves getting stuck when
involved with ISDN. There's a flaw in the eql scheduler that I have not
figured out yet, when involving very high speed interfaces.

IP over SCSI is a very interesting thing anyway, especially if you get into
clustering machines.

I know that Digital UNIX has a limit of 8 nodes or so in a cluster,
and the cluster we're working on now, has a limit of 4 shared devices
per bus, because the the controllers (id 6 and 7) are eating a couple
of slots. Probably would be a cool thing in the long run for Linux to
do some kind of clustering with UltraSCSI (or whatever *SCSI that
allows you to have 15 devices (or 14 in this case) to play with.).

> Eric Hoeltzel

--
Simon Janes              http://abies.com  
Abies LINUX Consulting   ph: 703-486-3828      
sjanes@abies.com         fx: 703-486-3828      
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