Filesystem Size

[SaraLouise]

I need to make a filesystem of 700MB in size.

Can any one tell me the calculation I need to work out the value to be entered in the size field? I seem to be going in ever decreasing circles!!

Many Thanks

 

[PSD]

Sara Louise,

If you want 700 megs you new to create a filesystem:

1400000

This is in 512 byte blocks, so halve that figure and you will have 700 megs roughly.

Cheers PSD
IBM Certified Specialist - AIX V4.3 Systems Support
IBM Certified Specialist - AIX V4 HACMP

 

[crowe]

The exact size can be figured by this. Find out what the PP size is for the volume group that you are working in.

# lsvg rootvg
(expample)
PP SIZE: 16 megabyte(s)

Then take 16 * 1024

16384

So 16384 kbytes is the factor in which the filesystem will grow. If you wanted a 100 meg file system, you would caculate it like this.

(100 * 1024) / 16384 = 6.25

So the 100 meg filesystem has to be a factor of 6 or 7. 6 being just under 100 meg, 7 being just over 100 meg. Also, when actually expanding the filesystem, you have to take the final number (6*16384=98304 or 7*16384=114688) and double that, because our numbers are in 1024k blocks and AIX expects 512k blocks. So here is our command.

# chfs -a size=229376 /tmp

This will set /tmp to 112 megabytes.

Hope that helps.

crowe

 

[redwings]

Sara Louise,

Another way to convert 700MBs to 512K blocks is like this:

(700 X 1048576) / 512

I have been using this formula for a while now, it works for me.

I hope it helps

redwings