Hello,

I'm going to hot remove some LUNS that were used as storage domains from a 4.4.7 environment.

I have already removed them for oVirt.

I think I would use the remove_mpath_device.yml playbook if I find it... it seems it should be in examples dir inside ovirt ansible collections, but there is not...

Anyway I'm aware of the corresponding manual steps of (I think version 8 doesn't differ from 7 in this):

. get disks name comprising the multipath device to remove

 

. remove multipath device

multipath -f "{{ lun }}"

. flush I/O

blockdev --flushbufs {{ item }}

for every disk that was comprised in the multipath device

. remove disks

echo 1 > /sys/block/{{ item }}/device/delete

for every disk that was comprised in the multipath device

My main doubt is related to the LVM structure that I can see is yet present on the multipath devices.

Eg for a multipath device 360002ac0000000000000013e0001894c:

# pvs --config 'devices { filter = ["a|.*|" ] }' | grep 360002ac0000000000000013e0001894c
  /dev/mapper/360002ac0000000000000013e0001894c a7f5cf77-5640-4d2d-8f6d-abf663431d01 lvm2 a--    <4.00t <675.88g

# lvs --config 'devices { filter = ["a|.*|" ] }' a7f5cf77-5640-4d2d-8f6d-abf663431d01
  LV                                   VG                                   Attr       LSize   Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  067dd3d0-db3b-4fd0-9130-c616c699dbb4 a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 900.00g
  1682612b-fcbb-4226-a821-3d90621c0dc3 a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi-------  55.00g
  3b863da5-2492-4c07-b4f8-0e8ac943803b a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 128.00m
  47586b40-b5c0-4a65-a7dc-23ddffbc64c7 a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi-------  35.00g
  7a5878fb-d70d-4bb5-b637-53934d234ba9 a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 570.00g
  94852fc8-5208-4da1-a429-b97b0c82a538 a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi-------  55.00g
  a2edcd76-b9d7-4559-9c4f-a6941aaab956 a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 128.00m
  de08d92d-611f-445c-b2d4-836e33935fcf a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 300.00g
  de54928d-2727-46fc-81de-9de2ce002bee a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi-------   1.17t
  f9f4d24d-5f2b-4ec3-b7e3-1c50a7c45525 a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 300.00g
  ids                                  a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 128.00m
  inbox                                a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 128.00m
  leases                               a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi-------   2.00g
  master                               a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi-------   1.00g
  metadata                             a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 128.00m
  outbox                               a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi------- 128.00m
  xleases                              a7f5cf77-5640-4d2d-8f6d-abf663431d01 -wi-------   1.00g

So the question is:

would it be better to execute something like

lvremove for every LV lv_name

lvremove --config 'devices { filter = ["a|.*|" ] }' a7f5cf77-5640-4d2d-8f6d-abf663431d01/lv_name

vgremove

vgremove --config 'devices { filter = ["a|.*|" ] }' a7f5cf77-5640-4d2d-8f6d-abf663431d01

pvremove

pvremove --config 'devices { filter = ["a|.*|" ] }' /dev/mapper/360002ac0000000000000013e0001894c

and then proceed with the steps above or nothing at all as the OS itself doesn't "see" the LVMs and it is only an oVirt view that is already "clean"?

Also because LVM is not cluster aware, so after doing that on one node, I would have the problem about LVM rescan on other nodes....

Thanks in advance,

Gianluca