Tanti Technology

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Bangalore, karnataka, India
Multi-platform UNIX systems consultant and administrator in mutualized and virtualized environments I have 4.5+ years experience in AIX system Administration field. This site will be helpful for system administrator in their day to day activities.Your comments on posts are welcome.This blog is all about IBM AIX Unix flavour. This blog will be used by System admins who will be using AIX in their work life. It can also be used for those newbies who want to get certifications in AIX Administration. This blog will be updated frequently to help the system admins and other new learners. DISCLAIMER: Please note that blog owner takes no responsibility of any kind for any type of data loss or damage by trying any of the command/method mentioned in this blog. You may use the commands/method/scripts on your own responsibility. If you find something useful, a comment would be appreciated to let other viewers also know that the solution/method work(ed) for you.

Saturday, 19 October 2019

How to shrink file system on AIX cluster and assign free space to other FS in Same volume group


Hello Friends Today i am going to discuss how to shrink File system on AIX HACMP cluster and assign that free space to other FS which is in  same volume group.




Prerequisite before File system shrink

1. Make sure that there is enough free space available on FS which you decided to shrink.
2.Also make sure that there is no error related file system which you are shrinking.
3.Make sure that both FS are in same volume group, because after FS size shrink if other file system which we want to extend using free space  is not in same VG then we cant extend that FS.

Let say we have scenario like below

In AIX cluster there is file system name /share/log of size 500GB and we want to shrink it by 100 GB and after shrinking /share/log assign space which we shrinked to FS /share/oracle .

step 1: Shrink /share/log by 100 GB

#cd /usr/sbin/cluster/sbin 
#./cl_chfs -a size=-100G /share/log

After shrink using command cl_chfs make sure that FS is shrinked using following command

#df -gt /share/log 

step 2:
Add space to file system /share/oracle using following command.

#cd /usr/sbin/cluster/sbin 
#./cl_chfs -a size=+100G /share/oracle

After FS extend confirm using following command.

#df -gt /share/oracle

This trick will help when there is no free space in AIX volume group and we need to immediately expand file system on AIX cluster/non-cluster setup.

Thanks !!!!!!!!!!!!!

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