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IDS Forum

Re: about chunks and raw partition

Posted By: Jack Parker
Date: Wednesday, 16 July 2003, at 9:04 a.m.

In Response To: about chunks and raw partition (Support Informix )


Happens sometimes, you keep a spare disk lying around, then you need a
little disk for this database, or a little disk for that one, so you grab a
little. No performance benefit at all. It's kind of sloppy, but not too
harmful - if it ain't broke....., but next time you reorg you could drop and
re-add as one chunk - just to be tidy.

cheers
j.
----- Original Message -----
From: "Support Inf...." <supinformix@dofi.fgov.be>
To: <ids@iiug.org>
Sent: Wednesday, July 16, 2003 5:46 AM
Subject: about chunks and raw partition [1560]


> Hello,
>
> (first, sorry for the html tags, I can't remove them)
>
> We have a little DB with a bizar chunk configuration.
> And I'm wondering why should my predecessors splitting up unix partitions
in
> several chunks ?
>
> Unix partition /dev/rdblv03 (1Giga) is added as 1 big chunk in DBspace
> v2_dbs.
> This DBspace contains a test database "v04test".
>
> Unix partition /dev/rdblv01 (1Giga) is added as 5 chunks (each 100 or 200
> Mega) in rootdbs and v1_dbs.
> The DBspace v1_dbs contains the production database "v04" splitted over 4
> chunks.
>
> Do we have any benefits for DB "v04" spread over 4 chunks, but in the same
> raw device ?
> Would this allow more kio threads and so advantage the io performances ?
> What is the best we can do ?
> Next week we will dbexport-dbimport the data, so we can change things if
> necessary!
>
>
> Our system is an AIX 4.3 single cpu and local disk.
>
> Thanks a lot ?
>
> Yves
>
>
> Here is the result of the onstat -d
> Informix Dynamic Server Version 7.30.UC7 -- On-Line -- Up 6 days
22:08:50
> -- 127984 Kbytes
>
> Dbspaces
> address number flags fchunk nchunks flags owner name
> 4003e13c 1 1 1 1 N informix rootdbs
> 4003e948 2 1 2 4 N informix v1_dbs
> 4003ea04 3 2001 4 1 N T informix tempdbs
> 4003eac0 4 1 7 1 N informix v2_dbs
> 4 active, 2047 maximum
>
> Chunks
> address chk/dbs offset size free bpages flags pathname
> 4003e1f8 1 1 0 50000 18961 PO- /dev/rdblv01
> 4003e420 2 2 50000 50000 14 PO- /dev/rdblv01
> 4003e4fc 3 2 100000 50000 50 PO- /dev/rdblv01
> 4003e5d8 4 3 0 250000 249947 PO- /dev/rdblv02
> 4003e6b4 5 2 150000 75000 705 PO- /dev/rdblv01
> 4003e790 6 2 225000 25000 14181 PO- /dev/rdblv01
> 4003e86c 7 4 0 250000 117195 PO- /dev/rdblv03
> 7 active, 2047 maximum
>
> ------_=_NextPart_001_01C34B7E.ECA71040
> Content-Type: text/html;
> charset="iso-8859-1"
> Content-Transfer-Encoding: quoted-printable
>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
> <HTML>
> <HEAD>
> <META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
> charset=3Diso-8859-1">
> <META NAME=3D"Generator" CONTENT=3D"MS Exchange Server version =
> 5.5.2653.12">
> <TITLE>about chunks and raw partition </TITLE>
> </HEAD>
> <BODY>
>
> <P><FONT SIZE=3D2>Hello,</FONT>
> </P>
>
> <P><FONT SIZE=3D2>(first, sorry for the html tags, I can't remove =
> them)</FONT>
> </P>
>
> <P><FONT SIZE=3D2>We have a little DB with a bizar chunk =
> configuration.</FONT>
> <BR><FONT SIZE=3D2>And I'm wondering why should my predecessors =
> splitting up unix partitions in several chunks ?</FONT>
> </P>
>
> <P><FONT SIZE=3D2>Unix partition /dev/rdblv03 (1Giga) is added as 1 big =
> chunk in DBspace v2_dbs.</FONT>
> <BR><FONT SIZE=3D2>This DBspace contains a test database =
> &quot;v04test&quot;.</FONT>
> </P>
>
> <P><FONT SIZE=3D2>Unix partition /dev/rdblv01 (1Giga) is added as 5 =
> chunks (each 100 or 200 Mega) in rootdbs and v1_dbs.</FONT>
> <BR><FONT SIZE=3D2>The DBspace v1_dbs contains the production database =
> &quot;v04&quot; splitted over 4 chunks.</FONT>
> </P>
>
> <P><FONT SIZE=3D2>Do we have any benefits for DB &quot;v04&quot; spread =
> over 4 chunks, but in the same raw device ?</FONT>
> <BR><FONT SIZE=3D2>Would this allow more kio threads and so advantage =
> the io performances ?</FONT>
> <BR><FONT SIZE=3D2>What is the best we can do ?</FONT>
> <BR><FONT SIZE=3D2>Next week we will dbexport-dbimport the data, so we =
> can change things if necessary!</FONT>
> </P>
> <BR>
>
> <P><FONT SIZE=3D2>Our system is an AIX 4.3 single cpu and local =
> disk.</FONT>
> </P>
>
> <P><FONT SIZE=3D2>Thanks a lot ?</FONT>
> </P>
>
> <P><FONT SIZE=3D2>Yves</FONT>
> </P>
> <BR>
>
> <P><FONT SIZE=3D2>Here is the result of the onstat -d </FONT>
> <BR><FONT SIZE=3D2>Informix Dynamic Server Version 7.30.UC7&nbsp;&nbsp; =
> -- On-Line -- Up 6 days 22:08:50 -- 127984 Kbytes</FONT>
> </P>
>
> <P><FONT SIZE=3D2>Dbspaces</FONT>
> <BR><FONT SIZE=3D2>address&nbsp; number&nbsp;&nbsp; =
> flags&nbsp;&nbsp;&nbsp; fchunk&nbsp;&nbsp; nchunks&nbsp; =
> flags&nbsp;&nbsp;&nbsp; owner&nbsp;&nbsp;&nbsp; name</FONT>
> <BR><FONT SIZE=3D2>4003e13c 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> N&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; informix rootdbs</FONT>
> <BR><FONT SIZE=3D2>4003e948 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> N&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; informix v1_dbs</FONT>
> <BR><FONT SIZE=3D2>4003ea04 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 2001&nbsp;&nbsp;&nbsp;&nbsp; =
> 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; N =
> T&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; informix tempdbs</FONT>
> <BR><FONT SIZE=3D2>4003eac0 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> 1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
> N&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; informix v2_dbs</FONT>
> <BR><FONT SIZE=3D2>&nbsp;4 active, 2047 maximum</FONT>
> </P>
>
> <P><FONT SIZE=3D2>Chunks</FONT>
> <BR><FONT SIZE=3D2>address&nbsp; chk/dbs offset&nbsp;&nbsp; =
> size&nbsp;&nbsp;&nbsp;&nbsp; free&nbsp;&nbsp;&nbsp;&nbsp; =
> bpages&nbsp;&nbsp; flags pathname</FONT>
> <BR><FONT SIZE=3D2>4003e1f8 1&nbsp;&nbsp; 1&nbsp;&nbsp; =
> 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 50000&nbsp;&nbsp;&nbsp; =
> 18961&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
> nbsp; PO-&nbsp;&nbsp; /dev/rdblv01</FONT>
> <BR><FONT SIZE=3D2>4003e420 2&nbsp;&nbsp; 2&nbsp;&nbsp; =
> 50000&nbsp;&nbsp;&nbsp; 50000&nbsp;&nbsp;&nbsp; =
> 14&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
> p;&nbsp;&nbsp;&nbsp; PO-&nbsp;&nbsp; /dev/rdblv01</FONT>
> <BR><FONT SIZE=3D2>4003e4fc 3&nbsp;&nbsp; 2&nbsp;&nbsp; =
> 100000&nbsp;&nbsp; 50000&nbsp;&nbsp;&nbsp; =
> 50&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
> p;&nbsp;&nbsp;&nbsp; PO-&nbsp;&nbsp; /dev/rdblv01</FONT>
> <BR><FONT SIZE=3D2>4003e5d8 4&nbsp;&nbsp; 3&nbsp;&nbsp; =
> 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 250000&nbsp;&nbsp; =
> 249947&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
> PO-&nbsp;&nbsp; /dev/rdblv02</FONT>
> <BR><FONT SIZE=3D2>4003e6b4 5&nbsp;&nbsp; 2&nbsp;&nbsp; =
> 150000&nbsp;&nbsp; 75000&nbsp;&nbsp;&nbsp; =
> 705&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
> sp;&nbsp;&nbsp; PO-&nbsp;&nbsp; /dev/rdblv01</FONT>
> <BR><FONT SIZE=3D2>4003e790 6&nbsp;&nbsp; 2&nbsp;&nbsp; =
> 225000&nbsp;&nbsp; 25000&nbsp;&nbsp;&nbsp; =
> 14181&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
> nbsp; PO-&nbsp;&nbsp; /dev/rdblv01</FONT>
> <BR><FONT SIZE=3D2>4003e86c 7&nbsp;&nbsp; 4&nbsp;&nbsp; =
> 0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 250000&nbsp;&nbsp; =
> 117195&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
> PO-&nbsp;&nbsp; /dev/rdblv03</FONT>
> <BR><FONT SIZE=3D2>&nbsp;7 active, 2047 maximum </FONT>
> </P>
>
> </BODY>
> </HTML>
> ------_=_NextPart_001_01C34B7E.ECA71040--
>
>
>
>

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