09-24-2014
Hi,
The RAID10 performance will be faster, but I'm not sure it will be twice as fast. Generally better performance is related to an increase on the number of spindles. There are also benefits to be derived from the committal regime but there can be a certain amount of trial and error, there are a great many factors that influence the performance of a RAID array - that's why there are a great many books and courses on the subject.
Regards
Dave
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LEARN ABOUT CENTOS
pmprintvalue
PMPRINTVALUE(3) Library Functions Manual PMPRINTVALUE(3)
NAME
pmPrintValue - print a performance metric value
C SYNOPSIS
#include <stdio.h>
#include <pcp/pmapi.h>
void pmPrintValue(FILE *f, int valfmt, int type, const pmValue *val, int minwidth);
cc ... -lpcp
DESCRIPTION
The value of a single performance metric (as identified by val) is printed on the standard I/O stream identified by f.
The value of the performance metric is interpreted according to the format of val as defined by valfmt (from a pmValueSet within a pmResult
structure; see pmFetch(3)) and the generic description of the metrics type passed in via type.
The value for type is typically extracted from a pmDesc structure, following a call to pmLookupDesc(3) for a particular performance metric.
The output will be optionally padded to be at least minwidth characters wide.
pmPrintValue is most useful for displaying values of performance metrics from pmFetch(3) (which returns a set of valfmt and val pairs for
each requested metric), based upon the metrics type as returned from pmLookupDesc(3).
SEE ALSO
PMAPI(3), pmAtomStr(3), pmConvScale(3), pmExtractValue(3), pmFetch(3), pmLookupDesc(3), pmTypeStr(3) and pmUnitsStr(3).
Performance Co-Pilot PCP PMPRINTVALUE(3)