On Mon, 2006-10-16 at 16:24 -0400, Bowie Bailey wrote: > William L. Maltby wrote: > > On Fri, 2006-10-13 at 11:44 -0400, Bowie Bailey wrote: > > > Kirk Bocek wrote: > > > > <snip> WOW! Do I have a typo bug or what? > > > > > Right now, I am not looking for maximum performance. I am just > > > trying to determine why there is a 3x difference in write > > > performance between two identical machines. > > > > 60 vs. 40 conductor cables on UDMA? have you wiggled/reseated them? s/60/80/ > > These are SATA drives, but I have checked the cable connections. > <snip> > > /var/log/messages BogoMips the same? > > I'm not familiar with this. In /var/log/messages (and dmesg too, IIRC) is a "rating" of performance for the CPU. "BogoMIPS" is the name. Also in there is "Detected xxxx.x MHz processor". I was thinking if there is any substantial difference, maybe that is a clue. E.g. if PS is weak, one of the processors may run slow. I just finished chasing some junk caused by a weak PS. AMD 2200+, s/b 1.8GHz, was running 1.38GHz. Popped in a 575 watt (425 continuous) PS and all is good again. > > > Mem config same? > > Yep. They've both got 16GB of RAM (6GB allocated to Huge Pages and > about 9GB free). In BIOS, same timings on memory (CAS, etc.)? > > > Same "load". Does top in a "long" screen show any diference in number > > of loads or total load being imposed? Keep an eye out for excessive > > wait channels in top (have to change defaults of fields displayed and > > order) or in ps? > > I haven't seen that. I'll keep an eye on it next time. > > > Are you using the sar reports, which can be helpful in the case of > > large unknowns. > > I haven't used the sar reports. Sar tends to be a bit cryptic. If > you can give me a useful command line, I'll check it out. It has been so long since I did admin jobs for real, I can't help you. But there's lots of strong admins here. Guys/gals, help the man out here? > > Thanks! > Sorry I can't be more help. I just acquired my first two SATA drives and have yet to install and start using them.