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about chunks and raw partition

Posted By: Support Informix
Date: Wednesday, 16 July 2003, at 5:46 a.m.

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">
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5.5.2653.12">
<TITLE>about chunks and raw partition </TITLE>
</HEAD>
<BODY>

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           &=
nbsp; PO-   /dev/rdblv01
 4003e420 2   2   =
50000    50000    =
14           &nbs=
p;    PO-   /dev/rdblv01
 4003e4fc 3   2   =
100000   50000    =
50           &nbs=
p;    PO-   /dev/rdblv01
 4003e5d8 4   3   =
0        250000   =
249947           =
PO-   /dev/rdblv02
 4003e6b4 5   2   =
150000   75000    =
705           &nb=
sp;   PO-   /dev/rdblv01
 4003e790 6   2   =
225000   25000    =
14181           &=
nbsp; PO-   /dev/rdblv01
 4003e86c 7   4   =
0        250000   =
117195           =
PO-   /dev/rdblv03
  7 active, 2047 maximum 


</BODY>
</HTML>
------_=_NextPart_001_01C34B7E.ECA71040--

Messages In This Thread

about chunks and raw partition
Support Informix -- Wednesday, 16 July 2003, at 5:46 a.m.
- Re: about chunks and raw partition
  Jack Parker -- Wednesday, 16 July 2003, at 9:04 a.m.
- Re: about chunks and raw partition
  Abraham Kirubakaran -- Friday, 18 July 2003, at 3:37 p.m.

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