extending File SYSTEM

[libchk]

how do you extend FS using smitty or the command line.

for example i would like to add 200MB to /usr which the threshold is about 90%

since 1pp = 256MB , how do you add 200MB using smitty first?

thanks

 

[khalidaaa]

chfs -a size=+200M /usr

Provided you have enough space in rootvg!

Regards,
Khalid

 

[libchk]

thanks khalidaa for the quick response, what if the FS is mirrored should i change the value to 400M ?

 

[jpor2003]

The command chfs -a size=+200M /usr will only be good if you are using AIX 5.3/ 6.1 If you are using AIX 4, 5.1 & 5.2 then the chfs -a command can be used but you will need to specifiy the block size and cannot specify Megabytes/Gigabytes. If the FS is mirroed then the mirror will extend for you, as long as you keep to retention. If it isn't in retention values then you will get an error message.

 

[p5wizard]

@libchk - since 1pp = 256MB , how do you add 200MB using smitty first?

With PP size 256MB you can't add 200MB, chfs will round up to next PP multiple, in this case: 256MB

@jpor2003

What do you mean by "as long as you keep to retention. If it isn't in retention values then you will get an error message" ?


HTH,

p5wizard

 

[khalidaaa]

jpor2003

I have aix5.2 and i don't have to specify the block size when using that command!

p5wizard

You are right again about the pp size

libchk

This command will take care of the mirrored fs as long as you have enough space in the vg!

For more info:

http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.cmds/doc/aixcmds1/chfs.htm

Regards,
Khalid

 

[p5wizard]

One more note: if your PP size is 256MB and you want to add at least 200MB you might as well chfs like this:

[/tt]chfs -asize=+[red]1[/red] /usr[tt]

To add (+1 = plus one 512byte block) to the FS size, the system needs to add additional LPs (1, 2 or 3 PPs - that depends on which mirroring level you have) to the underlying LV's size, so in this case it rounds up the FS increase to +256MB or +262144KB or +524288 512byte blocks.

And this is regardless of your AIX version (has worked like this since AIX V3).


HTH,

p5wizard