Not able unmirror after mirroring a old LV with new disk as part of storage migration

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Below is the error that i am getting post themirroring is completed 100%.

[root@trulodb0009 ~]# lvconvert -m0 /dev/testvg/testvol /dev/emcpowerp /dev/emcpowerq
No free extents on physical volume "/dev/emcpowerp"
No free extents on physical volume "/dev/emcpowerq"
No specified PVs have space available
[root@trulodb0009 ~]#

[root@trulodb0009 ~]# lvs --all --segments -o +devices | grep test
testvol testvg mwi-ao 2 mirror 17.05G testvol_mimage_0(0),testvol_mimage_1(0)
[testvol_mimage_0] testvg iwi-ao 1 linear 8.53G /dev/emcpowerp(0)
[testvol_mimage_0] testvg iwi-ao 1 linear 8.53G /dev/emcpowerq(0)
[testvol_mimage_1] testvg iwi-ao 1 linear 17.05G /dev/dm-15(0)
[root@trulodb0009 ~]#