Performance degraded after storage migration using "pvmove"

Issue

• After pvmove migration readahead value of lvm goes to 0.

[root@localhost ~]# lvs -o +devices testvg
  LV   VG     Attr       LSize    Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert Devices     
  lv1  testvg -wi-a----- 1020.00m                                                     /dev/sda1(0)

[root@localhost ~]# dmsetup info -C | grep testvg
testvg-lv1       253   0 L--w    0    1      0 LVM-PnvXfWMsSNlCuBBaPjAMrZj0kDozXiGQ6pzs2hetmQegGWlhrtUvOywDlg9oFCX5

[root@localhost ~]# cat /sys/block/dm-0/queue/read_ahead_kb 
128

 Do a pvmove  and Check the read_ahead_kb value

[root@localhost ~]# pvmove /dev/sda1 /dev/sda2
  /dev/sda1: Moved: 0.39%
  /dev/sda1: Moved: 100.00%

[root@localhost ~]# cat /sys/block/dm-0/queue/read_ahead_kb 
0

• Performance degraded after storage migration using pvmove.