William L. Maltby wrote: > On Fri, 2006-10-13 at 11:44 -0400, Bowie Bailey wrote: > > Kirk Bocek wrote: > > > <snip> > > > 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? These are SATA drives, but I have checked the cable connections. > PS sizes similar and simailar load? Identical PS. Load should be similar. Tests have been done at runlevel 5 with nobody using the system. > /var/log/messages BogoMips the same? I'm not familiar with this. > Mem config same? Yep. They've both got 16GB of RAM (6GB allocated to Huge Pages and about 9GB free). > 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. Thanks! -- Bowie