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Bug 1439925

Summary: RAID TAKEOVER: conversion attempts *from* linear should execute interim possibilities until segtype is achieved
Product: Red Hat Enterprise Linux 7 Reporter: Corey Marthaler <cmarthal>
Component: lvm2Assignee: Heinz Mauelshagen <heinzm>
lvm2 sub component: Mirroring and RAID QA Contact: cluster-qe <cluster-qe>
Status: CLOSED ERRATA Docs Contact:
Severity: low    
Priority: unspecified CC: agk, heinzm, jbrassow, mcsontos, msnitzer, prajnoha, rbednar, zkabelac
Version: 7.4   
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: lvm2-2.02.179-3.el7 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2018-10-30 11:02:16 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Corey Marthaler 2017-04-06 21:15:34 UTC 
Description of problem:
All volume type (besides linear) conversion attempts that are unsupported provide possible layouts in the warning messages.

# linear
[root@host-073 ~]# lvcreate -L 100M --type linear VG
  Logical volume "lvol0" created.
# striped
[root@host-073 ~]# lvcreate -L 100M -i 2 --type striped VG
  Using default stripesize 64.00 KiB.
  Rounding size 100.00 MiB (25 extents) up to stripe boundary size 104.00 MiB(26 extents).
  Logical volume "lvol1" created.
# raid1
[root@host-073 ~]# lvcreate -L 100M -m 1 --type raid1 VG
  Logical volume "lvol2" created.


[root@host-073 ~]# lvconvert --type raid6 VG/lvol0
  Using default stripesize 64.00 KiB.
  Conversion operation not yet supported.

[root@host-073 ~]# lvconvert --type raid6 VG/lvol1
  Using default stripesize 64.00 KiB.
  Replaced LV type raid6 with possible type raid6_n_6.
Do you want to convert raid6 LV VG/lvol1 to raid6_n_6? [y/n]: n
  Logical volume VG/lvol1 NOT converted.
  Converting VG/lvol1 from striped is directly possible to the following layouts:
    raid0
    raid0_meta
    raid10
    raid4
    raid5_n
    raid6_n_6

[root@host-073 ~]# lvconvert --type raid6 VG/lvol2
  Using default stripesize 64.00 KiB.
  Unable to convert LV VG/lvol2 from raid1 to raid6.
  Converting VG/lvol2 from raid1 is directly possible to the following layouts:
    mirror
    raid4
    raid5_n
    raid5_la
    raid5_ls
    raid5_ra
    raid5_rs


Version-Release number of selected component (if applicable):
lvm2-2.02.169-3.el7    BUILT: Wed Mar 29 09:17:46 CDT 2017
lvm2-libs-2.02.169-3.el7    BUILT: Wed Mar 29 09:17:46 CDT 2017
lvm2-cluster-2.02.169-3.el7    BUILT: Wed Mar 29 09:17:46 CDT 2017
device-mapper-1.02.138-3.el7    BUILT: Wed Mar 29 09:17:46 CDT 2017
device-mapper-libs-1.02.138-3.el7    BUILT: Wed Mar 29 09:17:46 CDT 2017
device-mapper-event-1.02.138-3.el7    BUILT: Wed Mar 29 09:17:46 CDT 2017
device-mapper-event-libs-1.02.138-3.el7    BUILT: Wed Mar 29 09:17:46 CDT 2017
device-mapper-persistent-data-0.7.0-0.1.rc6.el7    BUILT: Mon Mar 27 10:15:46 CDT 2017
Comment 2 Jonathan Earl Brassow 2017-05-10 15:30:34 UTC 
nice to have in 7.4, but not ex/bl worthy.  need to move to 7.5
Comment 7 Heinz Mauelshagen 2018-06-05 14:27:48 UTC 
lvm2 upstream commit bd7cdd0b09ba123b064937fddde08daacbed7dab
Comment 12 Corey Marthaler 2018-08-13 20:47:02 UTC 
Fix verified in the latest rpms. Linear segtypes can be eventually converted through interim steps to all the major raid types (mirror, raid1, raid4, raid5, raid6, raid10).


3.10.0-931.el7.x86_64
lvm2-2.02.180-2.el7    BUILT: Wed Aug  1 11:22:48 CDT 2018
lvm2-libs-2.02.180-2.el7    BUILT: Wed Aug  1 11:22:48 CDT 2018
lvm2-cluster-2.02.180-2.el7    BUILT: Wed Aug  1 11:22:48 CDT 2018
device-mapper-1.02.149-2.el7    BUILT: Wed Aug  1 11:22:48 CDT 2018
device-mapper-libs-1.02.149-2.el7    BUILT: Wed Aug  1 11:22:48 CDT 2018
device-mapper-event-1.02.149-2.el7    BUILT: Wed Aug  1 11:22:48 CDT 2018
device-mapper-event-libs-1.02.149-2.el7    BUILT: Wed Aug  1 11:22:48 CDT 2018
device-mapper-persistent-data-0.7.3-3.el7    BUILT: Tue Nov 14 05:07:18 CST 2017


[root@host-093 ~]# for i in $(seq 1 6); do lvcreate -L 100M --type linear VG; done
  Logical volume "lvol0" created.
  Logical volume "lvol1" created.
  Logical volume "lvol2" created.
  Logical volume "lvol3" created.
  Logical volume "lvol4" created.
  Logical volume "lvol5" created.

# raid1
[root@host-093 ~]# lvconvert --yes --type raid1 VG/lvol0
  Logical volume VG/lvol0 successfully converted.

# mirror
[root@host-093 ~]# lvconvert --yes --type mirror -m1 VG/lvol1
  Logical volume VG/lvol1 being converted.
  VG/lvol1: Converted: 8.00%
  VG/lvol1: Converted: 100.00%

# raid4
[root@host-093 ~]# lvconvert --yes --type raid4 VG/lvol2
  Using default stripesize 64.00 KiB.
  Replaced LV type raid4 with possible type raid1.
  Repeat this command to convert to raid4 after an interim conversion has finished.
  Logical volume VG/lvol2 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid4 VG/lvol2
  Using default stripesize 64.00 KiB.
  --stripes not allowed for LV VG/lvol2 when converting from raid1 to raid4.
  Logical volume VG/lvol2 successfully converted.

# raid5
[root@host-093 ~]# lvconvert --yes --type raid5 VG/lvol3
  Using default stripesize 64.00 KiB.
  Replaced LV type raid5 (same as raid5_ls) with possible type raid1.
  Repeat this command to convert to raid5 after an interim conversion has finished.
  Logical volume VG/lvol3 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid5 VG/lvol3
  Using default stripesize 64.00 KiB.
  --stripes not allowed for LV VG/lvol3 when converting from raid1 to raid5.
  Logical volume VG/lvol3 successfully converted.

# raid6
[root@host-093 ~]# lvconvert --yes --type raid6 VG/lvol4
  Using default stripesize 64.00 KiB.
  Replaced LV type raid6 (same as raid6_zr) with possible type raid1.
  Repeat this command to convert to raid6 after an interim conversion has finished.
  Logical volume VG/lvol4 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid6 VG/lvol4
  Using default stripesize 64.00 KiB.
  Replaced LV type raid6 (same as raid6_zr) with possible type raid5_ls.
  Repeat this command to convert to raid6 after an interim conversion has finished.
  --stripes not allowed for LV VG/lvol4 when converting from raid1 to raid5_ls.
  Logical volume VG/lvol4 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid6 VG/lvol4
  Using default stripesize 64.00 KiB.
  Convert raid5_ls LV VG/lvol4 to minimum 4 stripes first (i.e. --stripes 3).
  Converting VG/lvol4 from raid5_ls (same as raid5) is directly possible to the following layouts:
    raid5_n
    raid5_la
    raid5_ra
    raid5_rs
    raid6_ls_6
    raid1
[root@host-093 ~]# lvconvert --yes --type raid6 --stripes 3 VG/lvol4
  Using default stripesize 64.00 KiB.
  Converting raid5_ls LV VG/lvol4 to 3 stripes first.
  Replaced LV type raid6 (same as raid6_zr) with possible type raid5_ls.
  Repeat this command to convert to raid6 after an interim conversion has finished.
  WARNING: Adding stripes to active logical volume VG/lvol4 will grow it from 25 to 75 extents!
  Run "lvresize -l25 VG/lvol4" to shrink it or use the additional capacity.
  Logical volume VG/lvol4 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid6 VG/lvol4
  Using default stripesize 64.00 KiB.
  Replaced LV type raid6 (same as raid6_zr) with possible type raid6_ls_6.
  Repeat this command to convert to raid6 after an interim conversion has finished.
  Logical volume VG/lvol4 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid6 VG/lvol4
  Using default stripesize 64.00 KiB.
  Converting raid6_ls_6 LV VG/lvol4 to raid6 (same as raid6_zr).
  Logical volume VG/lvol4 successfully converted.

# raid10
[root@host-093 ~]# lvconvert --yes --type raid10 VG/lvol5
  Using default stripesize 64.00 KiB.
  Replaced LV type raid10 (same as raid10_near) with possible type raid1.
  Repeat this command to convert to raid10 after an interim conversion has finished.
  Logical volume VG/lvol5 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid10 VG/lvol5
  Using default stripesize 64.00 KiB.
  Replaced LV type raid10 (same as raid10_near) with possible type raid5_n.
  Repeat this command to convert to raid10 after an interim conversion has finished.
  --stripes not allowed for LV VG/lvol5 when converting from raid1 to raid5_n.
  Logical volume VG/lvol5 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid10 VG/lvol5
  Using default stripesize 64.00 KiB.
  Convert raid5_n LV VG/lvol5 to minimum 3 stripes first (i.e. --stripes 2).
  Converting VG/lvol5 from raid5_n is directly possible to the following layouts:
    striped
    raid0
    raid0_meta
    raid4
    raid6_n_6
    raid5_la
    raid5_ls
    raid5_ra
    raid5_rs
    raid1
[root@host-093 ~]# lvconvert --yes --type raid10 --stripes 2 VG/lvol5
  Using default stripesize 64.00 KiB.
  Converting raid5_n LV VG/lvol5 to 2 stripes first.
  Replaced LV type raid10 (same as raid10_near) with possible type raid5_n.
  Repeat this command to convert to raid10 after an interim conversion has finished.
  WARNING: Adding stripes to active logical volume VG/lvol5 will grow it from 25 to 50 extents!
  Run "lvresize -l25 VG/lvol5" to shrink it or use the additional capacity.
  Logical volume VG/lvol5 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid10 VG/lvol5
  Using default stripesize 64.00 KiB.
  Replaced LV type raid10 (same as raid10_near) with possible type raid0_meta.
  Repeat this command to convert to raid10 after an interim conversion has finished.
  Logical volume VG/lvol5 successfully converted.
[root@host-093 ~]# lvconvert --yes --type raid10 VG/lvol5
  Using default stripesize 64.00 KiB.
  Logical volume VG/lvol5 successfully converted.

[root@host-093 ~]# lvs -a -o +devices,segtype
  LV               VG  Attr       LSize    Log          Cpy%Sync Convert Devices                                                                                   Type
  lvol0            VG  rwi-a-r--- 100.00m               100.00           lvol0_rimage_0(0),lvol0_rimage_1(0)                                                       raid1
  [lvol0_rimage_0] VG  iwi-aor--- 100.00m                                /dev/sda1(0)                                                                              linear
  [lvol0_rimage_1] VG  iwi-aor--- 100.00m                                /dev/sdb1(1)                                                                              linear
  [lvol0_rmeta_0]  VG  ewi-aor---   4.00m                                /dev/sda1(200)                                                                            linear
  [lvol0_rmeta_1]  VG  ewi-aor---   4.00m                                /dev/sdb1(0)                                                                              linear
  lvol1            VG  mwi-a-m--- 100.00m  [lvol1_mlog] 100.00           lvol1_mimage_0(0),lvol1_mimage_1(0)                                                       mirror
  [lvol1_mimage_0] VG  iwi-aom--- 100.00m                                /dev/sda1(25)                                                                             linear
  [lvol1_mimage_1] VG  iwi-aom--- 100.00m                                /dev/sdb1(26)                                                                             linear
  [lvol1_mlog]     VG  lwi-aom---   4.00m                                /dev/sdh1(0)                                                                              linear
  lvol2            VG  rwi-a-r--- 100.00m               100.00           lvol2_rimage_0(0),lvol2_rimage_1(0)                                                       raid4
  [lvol2_rimage_0] VG  iwi-aor--- 100.00m                                /dev/sda1(50)                                                                             linear
  [lvol2_rimage_1] VG  iwi-aor--- 100.00m                                /dev/sdb1(52)                                                                             linear
  [lvol2_rmeta_0]  VG  ewi-aor---   4.00m                                /dev/sda1(201)                                                                            linear
  [lvol2_rmeta_1]  VG  ewi-aor---   4.00m                                /dev/sdb1(51)                                                                             linear
  lvol3            VG  rwi-a-r--- 100.00m               100.00           lvol3_rimage_0(0),lvol3_rimage_1(0)                                                       raid5
  [lvol3_rimage_0] VG  iwi-aor--- 100.00m                                /dev/sda1(75)                                                                             linear
  [lvol3_rimage_1] VG  iwi-aor--- 100.00m                                /dev/sdb1(78)                                                                             linear
  [lvol3_rmeta_0]  VG  ewi-aor---   4.00m                                /dev/sda1(202)                                                                            linear
  [lvol3_rmeta_1]  VG  ewi-aor---   4.00m                                /dev/sdb1(77)                                                                             linear
  lvol4            VG  rwi-a-r--- 300.00m               100.00           lvol4_rimage_0(0),lvol4_rimage_1(0),lvol4_rimage_2(0),lvol4_rimage_3(0),lvol4_rimage_4(0) raid6
  [lvol4_rimage_0] VG  iwi-aor--- 104.00m                                /dev/sda1(204)                                                                            linear
  [lvol4_rimage_0] VG  iwi-aor--- 104.00m                                /dev/sda1(100)                                                                            linear
  [lvol4_rimage_1] VG  iwi-aor--- 104.00m                                /dev/sdb1(129)                                                                            linear
  [lvol4_rimage_1] VG  iwi-aor--- 104.00m                                /dev/sdb1(104)                                                                            linear
  [lvol4_rimage_2] VG  iwi-aor--- 104.00m                                /dev/sdc1(26)                                                                             linear
  [lvol4_rimage_2] VG  iwi-aor--- 104.00m                                /dev/sdc1(1)                                                                              linear
  [lvol4_rimage_3] VG  iwi-aor--- 104.00m                                /dev/sdd1(26)                                                                             linear
  [lvol4_rimage_3] VG  iwi-aor--- 104.00m                                /dev/sdd1(1)                                                                              linear
  [lvol4_rimage_4] VG  iwi-aor--- 104.00m                                /dev/sde1(1)                                                                              linear
  [lvol4_rmeta_0]  VG  ewi-aor---   4.00m                                /dev/sda1(203)                                                                            linear
  [lvol4_rmeta_1]  VG  ewi-aor---   4.00m                                /dev/sdb1(103)                                                                            linear
  [lvol4_rmeta_2]  VG  ewi-aor---   4.00m                                /dev/sdc1(0)                                                                              linear
  [lvol4_rmeta_3]  VG  ewi-aor---   4.00m                                /dev/sdd1(0)                                                                              linear
  [lvol4_rmeta_4]  VG  ewi-aor---   4.00m                                /dev/sde1(0)                                                                              linear
  lvol5            VG  rwi-a-r--- 200.00m               100.00           lvol5_rimage_0(0),lvol5_rimage_2(0),lvol5_rimage_1(0),lvol5_rimage_3(0)                   raid10
  [lvol5_rimage_0] VG  iwi-aor--- 100.00m                                /dev/sda1(206)                                                                            linear
  [lvol5_rimage_0] VG  iwi-aor--- 100.00m                                /dev/sda1(125)                                                                            linear
  [lvol5_rimage_1] VG  iwi-aor--- 100.00m                                /dev/sdb1(156)                                                                            linear
  [lvol5_rimage_1] VG  iwi-aor--- 100.00m                                /dev/sdb1(131)                                                                            linear
  [lvol5_rimage_2] VG  iwi-aor--- 100.00m                                /dev/sdc1(28)                                                                             linear
  [lvol5_rimage_3] VG  iwi-aor--- 100.00m                                /dev/sdd1(28)                                                                             linear
  [lvol5_rmeta_0]  VG  ewi-aor---   4.00m                                /dev/sda1(205)                                                                            linear
  [lvol5_rmeta_1]  VG  ewi-aor---   4.00m                                /dev/sdb1(130)                                                                            linear
  [lvol5_rmeta_2]  VG  ewi-aor---   4.00m                                /dev/sdc1(27)                                                                             linear
  [lvol5_rmeta_3]  VG  ewi-aor---   4.00m                                /dev/sdd1(27)                                                                             linear
Comment 14 errata-xmlrpc 2018-10-30 11:02:16 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:3193