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LVM & Raw device i/o comparison
Post 302579173 by royalliege on Monday 5th of December 2011 03:31:46 AM
12-05-2011
LVM & Raw device i/o comparison
Please consider this a question about basics&best practices. On AIX 5.3 system, three raw physical volumes are defined from storage. While doing a read with command dd from the raw device, the speed rate is 250Mb/s.
Then, it gets complex when I define these three pv's to an lv of type raw. Doing a read from raw lv, the speed rate is 11Mb/s for each pv's giving a total of 33Mb/s.
I tried with different options sequential, parallel ...
Still no luck of getting closer to 250Mb/s. Is it reasonable or is there a best practice of getting closer to the speed rate with some parameters at the time of creating lv?
thanks
Then, it gets complex when I define these three pv's to an lv of type raw. Doing a read from raw lv, the speed rate is 11Mb/s for each pv's giving a total of 33Mb/s.
I tried with different options sequential, parallel ...
Still no luck of getting closer to 250Mb/s. Is it reasonable or is there a best practice of getting closer to the speed rate with some parameters at the time of creating lv?
thanks|
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LEARN ABOUT OSF1
auconvert
AUCONVERT(1) General Commands Manual AUCONVERT(1) NAME
auconvert - perform various conversion operations on sound files SYNOPSIS
auconvert [-file <format>] [-data <format>] [-rate <sample rate>] [-comment <comment>] [-raw <data format> <num tracks>] [-volume <per- cent>|`max'] [-?] [<input file>] [<output file>] DESCRIPTION
The auconvert program can be used to convert from one sound file format, and/or data format to another. It can also change the comment, sampling rate, and volume of a sound file. Finally, auconvert can be used to convert raw audio data into a sound file. If no input file name is given, standard input will be used. If no output file name is given, the original file will be replaced by the converted file or standard out will be used if the input is coming from standard input. OPTIONS
The following options may be used with auconvert: -file format The output file format. The -? option will display a list of valid file formats. -data format The output data format. The -? option will display a list of valid data formats. Note that each file format may only support selected data formats. -rate sample rate The output sampling rate (in hertz). -comment comment The comment to be stored in the output file. -volume <percent>|`max' The volume option can be used in two ways. If the argument is a percentage, the output file volume will be converted to the speci- fied percentage of the input volume. If the argument is the string `max', the output file volume will be converted to its maximum level. -raw <data format> <num tracks> This option is used to convert raw audio data into a sound file. <data format> is the data format of the raw data. <num tracks> specifies the number of tracks in the raw data. You must also use the -file and -rate options when converting raw data. -? Displays a usage message and a list of supported file and data formats. SEE ALSO
nas(1), auedit(1) COPYRIGHT
Copyright 1993, 1994 Network Computing Devices, Inc. AUTHOR
Greg Renda, Network Computing Devices, Inc. 1.9.3 AUCONVERT(1)