ciaraldi@cs.rochester.edu (Mike Ciaraldi) (09/01/88)
I am helping someone with a PDP-11/73 system running RT-11 and TSX. He had one Control Data 182 Megabyte disk drive. Under RT-11 and TSX, he addressed it as device type "DU". Since these operating systems only allow a disk drive to be a maximum of 32 Mb, we had to partition the drive using the SET DUn command. So, he had DU0: as the first 32Mb on the drive, DU1 as the next, and so on. Well, he just bought a second drive of the same type and size. The problem is that under RT-11 and TSX you can only have eight disk devices of one type, e.g. DU0 through DU7. So, if he uses 5 or 6 partitions of the first drive, he can only use 2 or 3 on the second drive. Or he can use 4 partitions on each drive, but that wastes 40 Mb from each drive. I have heard of new drivers that let you have more partitions on-line at the same time, e.g. DU0 through DU7, plus, say, DV0 through DV7, even though the drives are on the same controller. Does anyone have experience with these? I talked with someone who tried a driver he got from DECUS, and he said he had a lot of subtle problems on his 11/73, caused by slight incompatibilities with the 11/23 the author used. Has anyone tried it? I have also heard of a commercial product from a company called, I think, Network Dynamics, though I haven't been able to contact them yet. Has anyone dealt with them or other companies with similar products? Thanks for the help. Yours for greater disk space, Mike Ciaraldi ...rutgers!rochester!ciaraldi