12-04-2009
It would help if you provide some metrics.
What protocol are you using ?
on what interface/speed/mode ?
What actual rate are you observing ?
What components are between both boxes ?
What are the disks layout/performance on each side ?
What are reporting standard tools like "iostat -xtc 5 5", "netstat -i 5 5" during one of these transfers ?
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LEARN ABOUT CENTOS
pmdapmid
PMDAPMID(3) Library Functions Manual PMDAPMID(3)
NAME
pmdaPMID - translate a dynamic performance metric name into a PMID
C SYNOPSIS
#include <pcp/pmapi.h>
#include <pcp/impl.h>
#include <pcp/pmda.h>
int pmdaPMID(char *name, pmID *pmid, pmdaExt *pmda);
cc ... -lpcp_pmda -lpcp
DESCRIPTION
As part of the Performance Metrics Domain Agent (PMDA) API (see PMDA(3)), pmdaPMID is the generic callback for translating a dynamic metric
name into a PMID (pmid).
Because implementing dynamic performance metrics requires specific PMDA support, and the facility is an optional component of a PMDA (most
PMDAs do not support dynamic performance metrics), pmdaPMID is a skeleton implementation that returns PM_ERR_NAME.
A PMDA that supports dynamic performance metrics will provide a private callback that replaces pmdaPMID (by assignment to version.four.pmid
of the pmdaInterface structure) and implements the translation from a dynamic performance metric name into the associated pmid.
DIAGNOSTICS
pmdaPMID returns PM_ERR_NAME if the name is not recognized or cannot be translated, else returns 0.
CAVEAT
The PMDA must be using PMDA_PROTOCOL_4 or later, as specified in the call to pmdaDSO(3) or pmdaDaemon(3).
SEE ALSO
PMAPI(3), PMDA(3), pmdaDaemon(3), pmdaDSO(3), pmdaMain(3) and pmLookupName(3).
Performance Co-Pilot PCP PMDAPMID(3)