larry@nstar.uucp (Larry Snyder) (06/27/90)
billbr@xstor.UUCP (Bill Brothers) writes: >Bus-on/off generally won't affect the floppy unless running it on >the same DMA channel. Here at Storage Dimensions, we are regularly >using 3 host-adapters (not pure AHA-1542... modified for us) at full >tilt driving a full complement of disks. What on the 1542 are you changing for your drives? -- Larry Snyder, Northern Star Communications, Notre Dame, IN USA uucp: iuvax!ndmath!nstar!larry -or- larry@nstar Public Access Unix Site (219) 289-3745 / lots of files & free PEP feeds!
randyt@asdnet.uucp (Randy Terbush) (06/28/90)
In <190@xstor.UUCP> billbr@xstor.UUCP (Bill Brothers) writes: >larry@nstar.uucp (Larry Snyder) writes: >>After playing with the various parameters in my kernel to tweak >>the throughput - I have settled (for the time being) on the following: >>#define AHA_BUSON 9 >>#define AHA_BUSOFF 6 >Larry mentions his playing with the DMA rate. I would recommend running >a DMA test with any configuration that is going to be used with real >live data. Even one failure is not acceptable when it comes to my data. >But what he says is true. If your machine can handle it, turning up >the knobs dramatically improves performance. I have been tuning my new 1542/ISC2.2 installation also. Regarding data transfer rates, I was told that UNIX is more tolerant of lost data in copying due to its methods of file copying/checking, etc. More so than other OS's such as DOS. Is there any truth in this? -- Randy Terbush, 711 Eastridge Place, Boise, ID 83712 UUCP: asdnet!randyt INET: asdnet!randyt@sunstone.idbsu.edu