AIX ERRORS

when i trying increase file systems i get that error
0516-404 allocp: This system cannot fulfill the allocation request.
There are not enough free partitions or not enough physical volumes
to keep strictness and satisfy allocation requests. The command
should be retried with different allocation characteristics.
this due to at rootvg there exist mirror and containing two disks
hdisk0 & hdisk1 when i execute the lspv hdisk0 & lspv hdisk1
i found that there exist space of one and not the other
to solve that decrease one of file system from the disk have not free space

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