AIX File system design

[Former Member]

Dear Friends,

As i am going to install ECC6.0 ABAP on AIX5.3.

i Would like to know how should i design the File system on the AIX, and if you can help me with the concepts of Volume Group and Logical Volumes.

Regards

Ayush

[Former Member]

With DB2 and Oracle the to use CIO, concurrent IO, you must have created the filesystems with JFS2.

[former_member1351727]

Hi,

JFS2 is Enhanced Journaled File system.

So it is more advanced than JFS F/s.

JFS2 is capable of storing biger files compared to JFS.

And as per recommendation JFS is used with 32 bit and JFS2 is used with 64 bit.

And also in JFS 2 in has a better Inode utiluzation.

More info in the below link:

http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.baseadmn/doc/base...

And also we can create ,manage ,administer all the features using system mangement Interface tool called SMIT in AIX like craeting VG,LV,FS changing parameters of those (which ever is allowded to change ) .And also the clusters ,Spool configuration etc can be done by this SMIT tool (it has very user friendly menus ) .

Thanks.

[former_member1351727]

Hi,

This is brief about the VG (volume group) LV (logical volume) .

VG is collection of PV (physical volumes)

There is physical hard disks grouped into volume group.One PV can belong to one VG only.

LV(logical volume) Can reside in only one VG however can spread across number of disks in the same VG.

F/s is created they are of type JFS,JFS2.

There are lot of rules to before designing this structure.

what and all disks to be mirrored etc for data security as well as performance.

As the mirror log and origlog are not on the disk.

And also to decrease I/O traffic on Disk the Table spaces and f/s are need to be given importance while designing.

Allocation happens in PP level .LP and PP are mapped as the PPs are not contegious blocks so with the help og LP it is made seen as contigious allocation is done.

Internally PP and LP will be mapped.

VG>LV-> FS (Logical)----LP(logical partiton)

PV (physical)----PP(physical partiton)

You can get more information from the IBM redbooks to design and configure the f/s.

Thanks.

[Former Member]

hey Friends,

Thanks a lot for your wonderful explanantion...

Also i would like to ask you which one is preferable for the file system at the time when we design JFS or JFS2

Regards

Ayush

[nelis]

One other big advantage JFS2 has over JFS besides performance is the ability to reduce the size of the file system. Makes managing disk space easier! You have to explicitly tell it to use JFS2 though on install if you want your rootvg to use it otherwise it uses JFS by default.

Regards,

Nelis

[Former Member]

Hi,

check the installation guides.

following is example of file system on AIX.

/sapmnt/SID 5 GB

/usr/sap/SID 5 GB

/usr/sap/trans 5 GB

/oracle 5 GB

/oracle/ SID 10 GB

/oracle/ SID /102_64 10 GB

/oracle/ SID /sapdata1 50 GB

/oracle/ SID /sapdata2 50 GB

/oracle/ SID /sapdata3 50 GB

/oracle/ SID /sapdata4 50 GB

/oracle/ SID /sapdata5 50 GB

/oracle/ SID /sapdata6 50 GB

/oracle/ SID /origlogA 1 GB

/oracle/ SID /origlogB 1 GB

/oracle/ SID /mirrlogA 1 GB

/oracle/ SID /mirrlogB 1 GB

/oracle/ SID /oraarch 30GB

/oracle/ SID /sapreorg 10GB

/oracle/stage 7 GB

regards,

kaushal

[v_veeramalla]

We are planning to install ECC6.0 on HA environment in AIX 5.3

can u please give the structure of the file system on node B.

and Node A(my primary server )

[Former Member]

Dear All,

I am new to AIX OS

Can anyone guide me on the

Installation Procedure

file system recommendation and

size of the file system to considered in AIX

for Installing ECC 6.0 on DB2

Regards

Rakesh