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Tuesday, 14 February 2012

Calculate the Efficiency of your Logical Volume in AIX

# lslv -l hd2 : Command to view the LV fragmenation.

hd2:/usr
PV                COPIES      IN BAND        DISTRIBUTION
hdisk0        114:000:000        22%           000:042:026:000:046

COPIES: 114:000:000

114 : No.of LP's in the first copy.
000 : NO LP's,so no secound copy.
000 : NO LP's,so no third copy.

Therefore the LV is not mirrored.

IN BAND : Shows how well the Intrapolicy and the attribute of the LV is followed.

22%, higher the percentage, the better the allocation efficiency.

Each logical volume has its own intrapolicy. If the operating system cannot meet this requirement, it chooses the best way to meet the requirements.

DISTRIBUTION : edge : middle : center : inner-middle : inner-edge

               000     042       026         000         046            -----> 114 LP.
Since the LV was created with the intra allocation policy "Center"----------->No.of LP's at the center is "26"--->So, 26/(0+42+26+0+46) = 0.2280 * 100 = 22 %

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