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!