jeff@ssc-vax.UUCP (Jeffrey Jongeward) (03/07/84)
A local startup company has purchased a 750 from an OEM and 4.1 bsd binary license from a reputable Unix s/w house (whom I am inclined to think has provided good s/w). The 750 has twin eagles + a emulex sc750 controller. However, when dma-ing the same large block ( >8K ) from a raw file system (e.g. rhp0g) into memory multiple times you find that randomly (i.e. on about 1 out of 5 reads) there is disagreement over what is read - typically 8-20 bytes within the buffer will disagree. There seems to be a pattern to this disagreement - Not always the same bytes within one of the buffers, but often certain bytes offsets reoccur quite often. This causes havoc with fsck and with paging. sc750's have been changed, both drives have been used, memory controllers have been changed, memory exchanged, etc., but to no avail. The OEM is short on boards and when attempting to swap the cpu, they (somehow) blew the memory controller, so a cpu swap has not been tried. Has anyone else experienced this problem? Is there some incompatibility between certain 750 board rev. levels and certain sc750's?. Is this a timing problem, etc., etc. Does anyone know / has anyone experienced this before? This little startup company would thank you in advance had they a 750 that could be on the net, uw-beaver!ssc-vax!jeff