'[Evms-devel] Doubt about performance degradation (overhead) using'

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List:       evms-devel
Subject:    [Evms-devel] Doubt about performance degradation (overhead) using
From:       Andrés_Marchante_Tirado <andres.marchante () juntadeandalucia ! es
Date:       2007-01-16 13:19:33
Message-ID: !~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAAWXrQE3OOKU6YArMbtgy/dcKAAAAQAAAALDH8rp9xRkOqb5wG6WDPlQEAAAAA () juntadeandalucia ! es
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Hi to all:

I have tested several EVMS 2.x volumes with bonnie, iozone and dd tools to
obtain thoughput and timemarks. I have observed that times are almost
identical when using directly a plain device (ex. /dev/sda) or use this
device contained in a EVMS volume (/dev/evms/evms-01).

I have test several sizes for the volumes (100GB, 1TB, 4TB) with ext3, and
with 0% size used, 50% size used and 90% size used, and every time tests
were very similar using the plain device and the EVMS volume.

Which is the treatment for metadata and indirections to obtain this results?
Are the indirect access cached in memory?, what is the real overhead that i
can suffer using EVMS? Could the performance be degradated when volumes grow
with resizing or having a high use?

Thanks in advance.

Andrés.



----------------------------------------------------------------------------
-----
Andrés Marchante Tirado.
Responsable de Unidad de SVA y Sistemas.
Area de Ingeniería y Tecnología.
-----------------------------------------------------------------
Sociedad Andaluza para el Desarrollo
de la Sociedad de la Información S.A.U. 
Consejería de Innovación Ciencia y Empresa
JUNTA DE ANDALUCÍA
Avda. de la Arboleda s/n
41940 - Tomares, (Sevilla)
Teléfono: 955 06 39 33
Móvil: 697 955 536
e-mail: andres.marchante@juntadeandalucia.es


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<P><FONT SIZE=2 FACE="Arial">Hi to all:</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">I have tested several EVMS 2.x volumes with bonnie, \
iozone and dd tools to obtain thoughput and timemarks. I have observed that times are \
almost identical when using directly a plain device (ex. /dev/sda) or use this device \
contained in a EVMS volume (/dev/evms/evms-01).</FONT></P>

<P><FONT SIZE=2 FACE="Arial">I have test several sizes for the volumes (100GB, 1TB, \
4TB) with ext3, and with 0% size used, 50% size used and 90% size used, and every \
time tests were very similar using the plain device and the EVMS volume.</FONT></P>

<P><FONT SIZE=2 FACE="Arial">Which is the treatment for metadata and indirections to \
obtain this results? Are the indirect access cached in memory?, what is the real \
overhead that i can suffer using EVMS? Could the performance be degradated when \
volumes grow with resizing or having a high use?</FONT></P>

<P><FONT SIZE=2 FACE="Arial">Thanks in advance.</FONT>
</P>

<P><FONT SIZE=2 FACE="Arial">Andrés.</FONT>
</P>
<BR>
<BR>

<P><FONT SIZE=2 FACE="Arial">---------------------------------------------------------------------------------</FONT>


<BR><FONT SIZE=2 FACE="Tahoma">Andrés Marchante Tirado.</FONT>

<BR><FONT SIZE=2 FACE="Tahoma">Responsable de Unidad de SVA y Sistemas.</FONT>

<BR><FONT SIZE=2 FACE="Tahoma">Area de Ingeniería y Tecnología.</FONT>

<BR><FONT SIZE=2 FACE="Tahoma">-----------------------------------------------------------------</FONT>


<BR><FONT COLOR="#008000" SIZE=2 FACE="Tahoma">Sociedad Andaluza para el \
Desarrollo</FONT>

<BR><FONT COLOR="#008000" SIZE=2 FACE="Tahoma">de la Sociedad de la Información \
S.A.U. </FONT>

<BR><B><FONT COLOR="#008000" SIZE=2 FACE="Tahoma">Consejería de Innovación Ciencia y \
Empresa</FONT></B>

<BR><FONT COLOR="#008000" SIZE=2 FACE="Tahoma">JUNTA DE ANDALUCÍA</FONT>

<BR><FONT COLOR="#008000" SIZE=2 FACE="Tahoma">Avda. de la Arboleda s/n<BR>
41940 - Tomares, (Sevilla)</FONT>

<BR><FONT COLOR="#008000" SIZE=2 FACE="Tahoma">Teléfono: 955 06 39 33</FONT>

<BR><FONT COLOR="#008000" SIZE=2 FACE="Tahoma">Móvil: 697 955 536</FONT>

<BR><FONT COLOR="#008000" SIZE=2 FACE="Tahoma">e-mail: \
andres.marchante@juntadeandalucia.es</FONT> </P>

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</HTML>



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