0516-787 extendlv: Maximum allocation for logical volume hd11admin is 512

This is a very common error we get while trying to increase a filesystem. While attempting  to increase the size of /admin filesystem  by 1oGB,  I got this error as below .  I verified the VG for available space using lsvg  and the rootvg has 18GB of free space.

webmanul01:/> chfs -a size=+10G /admin
0516-787 extendlv: Maximum allocation for logical volume hd11admin
is 512.

It is not about the size of  file system. There is a limit called MAX LPs  , we need to increase  maximum logical partition number . We get this error when we are  right at the maximum or at least the extension you are trying exceeds that number.   So I followed the below steps to resolve the problem
Step 1 :  Run the command smitty chlv –>  Change a Logical Volume –> Press Enter –>LOGICAL VOLUME name — >Press F4
Step 2 : Select the LV  ,  here I have selected hd11admin and Press enter

Step 3:  Now here I have increase  the MAXIMUM NUMBER of LOGICAL PARTITIONS from 512 to 800 as below

Step 5 :  Press Enter and now command is OK as below as successfully.

webmanual01:/> smitty chlv
COMMAND STATUS

Command: OK                              stdout: no                                                 stderr: no

Before command completion, additional instructions may appear below.

Step 6 :  Now extend the  /admin filesystem
#chfs -a size=+10G /admin

 * Source Article from : Internet