calculate free space

[Ajin_1]

Dear Sir

How to calculate the free space available , to increase/extend a filesystem in HP-UX

Please Help

Regards

Ajin.S

[Pete Randall]

Start with bdf, then take a look at lvdisplay and vgdisplay. The bdf command tells you the space used and remaining in the file system. The lvdisplay command tells you whether there is unused space in the logical volume. And the vgdisplay tells you if the volume group has any unused space in which to extend the LV.

That said, you also probably need to look at lvextend and vgextend and newfs or extendfs.


Pete

[subodhbagade]

HI,

(1)# bdf ( to check free space of LV )

(2)For VG

#vgdisplay -v /dev/vg-name

free space in MB = PE size * free PE

(3)To extend LV ... if there no online JFS

umount /mount-point
#lvextend -L final-size MB /dev/vg/lv

#extendfs -F vxfs /dev/vg/rlvol

#mount /dev/vg/lv /mount-point

(4)If you have online JFS ...

# fsadm -b

No need to unmount the LV



Regards,
Subodh.

[R.K. #]

Hi Ajin,

To calculate the "unused" space in the Vg, use vgdisplay as below:

# vgdisplay vg_name
PE Size (Mbytes) 4 <<<<<<
Total PE 8680
Alloc PE 1000
Free PE 7676 <<<<<<

So the free space available in this Vg is:

Free space = PE Size * Free PE
Free space = 4 * 7676 mb

[Jupinder Bedi]

do vgdisplay vgname

see for free PE and PE size


and do free PE * PE size

[Fabio Ettore]

Hi,

if you want to check how much space is free in a already mounted filesystem use bdf, see that under the column avail which is in Kb. To know how much space you still have into the volume group multiply PE Size (which is in Mb) for Free PE that you see by vgdisplay. Then extend first lvol by lvextend and then filesystem by extendfs (with filesystem unmounted) or by fsadm (with filesystem mounted, it depends on having OnlineJFS installed).

HTH.

Best regards,
Fabio

[Johnson Punniyalingam]

Step 1:- bdf /file_system -> from "bdf" output you will be knowing which "Volume Group" does current file system exits

Step 2:-vgdisplay -v /dev/vg_name -> from this output look for (Free PE * PE Size) = Free Space left

Step 3:-lvextend -L /dev/vg_name/lvol_name

Step 4:-fsadm -F vxfs -b M /File_System_Name

(using fsadm -> you extend file system ONLINE)

If "don't have ONLINE JFS" use extendfs
Need to umount / downtime required

umount /File_System
lvextend -L /dev/vgXX/lvolXX
extendfs -F vxfs /dev/vgXX/rlvolXX -> raw logical name
mount -a

Finally but important take look man pages for below commands for more information

man bdf
man vgdisplay
man lvextend
man fsadm
man extendfs
man mount

[madhuchakkaravarthy]

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