Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

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+++ This bug was initially created as a clone of Bug #1778977 +++

Description of problem:
This is the issue requested to be tested in: https://bugzilla.redhat.com/show_bug.cgi?id=1722860#c9

And shown not to work in:
https://bugzilla.redhat.com/show_bug.cgi?id=1722860#c11


lvm2-2.02.186-2.el7.x86_64

# cat /sys/block/sd{a..b}/queue/read_ahead_kb
256
128

not using any 'preset' RA value for lv (reference to second sentence in Comment 9):
# lvcreate -n mylv -L100M vg /dev/sda
  Logical volume "mylv" created.

# ls -la /dev/mapper/vg-mylv
lrwxrwxrwx. 1 root root 7 Oct 10 11:25 /dev/mapper/vg-mylv -> ../dm-2

# lvs -o lv_name,devices vg
  LV   Devices
  mylv /dev/sdb(0)

# cat /sys/block/dm-2/queue/read_ahead_kb
128

# pvmove /dev/sdb /dev/sda
  /dev/sdb: Moved: 20.00%
  /dev/sdb: Moved: 100.00%


lv should have deduced RA of 256kb from /dev/sda but remained unchanged:
# cat /sys/block/dm-2/queue/read_ahead_kb
128

-----


Cloned for further investigation if this can by improved.

After evaluating this issue, there are no plans to address it further or fix it in an upcoming release.  Therefore, it is being closed.  If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.