tcs@usna.uucp (05/22/84)
>People running 4.2bsd on RP07's should be aware of the performance >difference the RP07-d option can make. Your notes on the problems with the RP07 and RH780 were very interesting, especially since our 11/780 has been running with the high speed option since it was installed in Sept, 1983. The Jan-Mar 1983 VAX Systems and Options catalog includes an RP07 system advertised as supporting the 2.2Mb/s transfer rate (SV-AXVCB-CA). This system was the older one with the 16Kbit rams so it included the extra memory controller. The new 64Kbit memory systems (our configuration) are actually a single SBI interface and two controllers, one for each bank of memory. I switched between the two modes of operation once when I suspected a transfer rate problem (no difference noted w.r.t. the problem). The entire disk *MUST* be reformatted to write the correct sector headers. Our DEC serviceman also installed the system without the clock jumper. It seems that all RP07's are shipped for interleaved operation. If I hadn't been aware of the jumper he would have happily left the system running at the 1.3Mb/s rate. Section 2.5.2.3 Drive Characteristics, page 2-27 of the RP07 user guide, is the only reference to it. I havn't run the benchmark programs on the system. Maybe when I get another disk. Terry Slattery M/S 11G U.S. Naval Academy Annapolis, Md 21402 301-267-4413 tcs%usna@brl (ARPA) decvax!brl-bmd!usna!tcs (UUCP)