VXVM tutorial-6- Volume online relayout

VXVM(veritas volume manager training) 6 of 10

VXVM Volume – online Re-layout:
In this post we are going to see how to convert the volume from one layout to another layout without un-mounting the volume.You can use the vxassist re-layout command to reconfigure the layout of a volume without taking it offline.

Supported re-layout for concatenated volumes

1. Converting a concatenation volume to mirror volume.(mirror-concat)

bash-3.00# vxprint -hvt
Disk group: UXDG
v  uxoravol1      -        ENABLED  ACTIVE  102400  SELECT  -  fsgen
pl uxoravol1-01  uxoravol1    ENABLED  ACTIVE  102400  CONCAT  -   RW
sd UXDISK1-01 uxoravol1-01 UXDISK1  0       102400   0  disk_0  ENA

Adding the mirror,

# vxassist -g UXDG mirror uxoravol1 &

We can use & or -b option in vxassist to move the task in background
We can see active mirror tasks using below commands.

# vxtask list
TASKID PTID TYPE/STATE PCT PROGRESS
170 - ATCOPY/R 60.00% 0/102400/61440 PLXATT uxoravol1 uxoravol1-02 UXDG auto-throttled
bash-3.00# vxtask monitor
175 - ATCOPY/R 92.00% 0/102400/94208 PLXATT uxoravol1 uxoravol1-02 UXDG auto-throttled
175 - ATCOPY/R 96.00% 0/102400/98304 PLXATT uxoravol1 uxoravol1-02 UXDG auto-throttled
175 - ATCOPY/R 100.00% 0/102400/102400 PLXATT uxoravol1 uxoravol1-02 UXDG auto-throttled

Now you can see second plex has been created.

# vxprint -hvt
Disk group: UXDG
v  uxoravol1      -        ENABLED  ACTIVE  102400  SELECT  -  fsgen
pl uxoravol1-01  uxoravol1    ENABLED  ACTIVE  102400  CONCAT  -   RW
sd UXDISK1-01 uxoravol1-01 UXDISK1  0       102400   0  disk_0  ENA
pl uxoravol1-02  uxoravol1    ENABLED  ACTIVE   102400 CONCAT  -   RW
sd UXDISK2-01 uxoravol1-02 UXDISK2  0        102400   0 disk_1  ENA

2.Converting concatenate volume to concat-mirror

Step:1-Adding the mirror

# vxassist -g UXDG mirror concatv1

i.e concatv1 is volume name

Step:2 – Converting the volume

# vxassist -g UXDG convert concatv1 layout=concat-mirror
# vxprint -hvt
Disk group: UXDG
v  concatv1 -  ENABLED  ACTIVE   102400   SELECT      -   fsgen
pl concatv1-03 concatv1 ENABLED  ACTIVE 102400 CONCAT -   RW
sv concatv1-S01 concatv1-03 concatv1-L01 1 102400 0 2/2   ENA

v  concatv1-L01 - ENABLED  ACTIVE   102400 SELECT    -      fsgen
pl concatv1-P01 concatv1-L01 ENABLED  ACTIVE 102400 CONCAT - RW
sd UXDISK1-02   concatv1-P01 UXDISK1  0   102400   0 disk_0  ENA
pl concatv1-P02 concatv1-L01 ENABLED  ACTIVE 102400 CONCAT - RW
sd UXDISK2-02   concatv1-P02 UXDISK2  0   102400   0 disk_1  ENA

3.Converting concatenate volume to mirror-stripe

Step:1–First Re-layout the concatenate volume to mirror-stripe once.

#vxassist -g UXDG relayout concatv1 layout=mirror-stripe
# vxprint -hvt
v  concatv1   - ENABLED   ACTIVE 102400 SELECT  concatv1-01 fsgen
pl concatv1-01 concatv1 ENABLED  ACTIVE   102400 STRIPE  2/128 RW
sv concatv1-Ds01 concatv1-01 concatv1-d01 1 51200  0/0  2/2   ENA
sv concatv1-Ds02 concatv1-01 concatv1-d02 1  51200  1/0 2/2   ENA

v  concatv1-d01 - ENABLED ACTIVE   51200 SELECT  -  fsgen
pl concatv1-dp01 concatv1-d01 ENABLED ACTIVE 51200  CONCAT  -  RW
sd UXDISK1-02    concatv1-dp01 UXDISK1 0    51200  0 disk_0   ENA
pl concatv1-dp02 concatv1-d01  ENABLED ACTIVE 51200 CONCAT  -  RW
sd UXDISK3-01    concatv1-dp02 UXDISK3 0    51200  0 disk_4   ENA

v  concatv1-d02 - ENABLED  ACTIVE   51200 SELECT  -    fsgen
pl concatv1-dp03 concatv1-d02 ENABLED ACTIVE 51200 CONCAT  -   RW
sd UXDISK2-01    concatv1-dp03 UXDISK2 0    51200  0 disk_1   ENA
pl concatv1-dp04 concatv1-d02 ENABLED ACTIVE 51200 CONCAT  -   RW
sd UXDISK4-01    concatv1-dp04 UXDISK4 0    51200  0 disk_5   ENA

Step:2– Once the convert has been done,then use vxassist convert to convert the volume to mirror-stripe.

# vxassist -g UXDG convert concatv1 layout=mirror-stripe
bash-3.00# vxprint -hvt
Disk group: UXDG
v  concatv1  -  ENABLED  ACTIVE   102400   SELECT    -  fsgen
pl concatv1-02  concatv1 ENABLED  ACTIVE 102400 STRIPE  2/128 RW
sd UXDISK1-01   concatv1-02  UXDISK1  0  51200    0/0 disk_0  ENA
sd UXDISK2-02   concatv1-02  UXDISK2  0  51200    1/0 disk_1  ENA
pl concatv1-03  concatv1 ENABLED  ACTIVE 102400 STRIPE 2/128  RW
sd UXDISK3-02   concatv1-03  UXDISK3  0  51200    0/0 disk_4  ENA
sd UXDISK4-02   concatv1-03  UXDISK4  0  51200    1/0 disk_5  ENA

4.Converting concatenate volume to raid5

Here using vxassist re-layout command, we are converting existing concatenate volume to raid5

# vxassist -g UXDG relayout concatv1 layout=raid5

You can check task status ,using the below command.

# vxtask list
TASKID  PTID TYPE/STATE    PCT   PROGRESS
182  -   RELAYOUT/R 49.97% 0/204800/102336 RELAYOUT concatv1 UXDG
# vxtask monitor
TASKID PTID TYPE/STATE    PCT   PROGRESS
182    - RELAYOUT/R 57.97% 0/204800/118720 RELAYOUT concatv1 UXDG
182    - RELAYOUT/R 58.97% 0/204800/120768 RELAYOUT concatv1 UXDG
182    - RELAYOUT/R 59.97% 0/204800/122816 RELAYOUT concatv1 UXDG

You can see volume has been converted to Raid5.

bash-3.00# vxprint -hvt
Disk group: UXDG
v  concatv1 - ENABLED  ACTIVE   102400   RAID      -        raid5
pl concatv1-Dp02 concatv1 ENABLED  LOG  2880  CONCAT    -   RW
sd UXDISK2-02 concatv1-Dp02 UXDISK2 51200 2880 0  disk_1   ENA
pl concatv1-01 concatv1 ENABLED ACTIVE  102400  RAID  3/32     RW
sd UXDISK1-03  concatv1-01  UXDISK1  0  51200    0/0 disk_0   ENA
sd UXDISK2-03  concatv1-01  UXDISK2 0   51200    1/0 disk_1   ENA
sd UXDISK3-02  concatv1-01  UXDISK3 0   51200    2/0 disk_4   ENA

5.Converting concatenate volume to stripe:
Here using vxassist re-layout command, we are converting existing concatenate volume to stripe.

#vxassist -g UXDG relayout concatv1 layout=stripe
bash-3.00# vxprint -hvt
Disk group: UXDG
v  concatv1 - ENABLED  ACTIVE   102400 SELECT concatv1-01 fsgen
pl concatv1-01 concatv1 ENABLED ACTIVE 102400 STRIPE  2/128    RW
sd UXDISK0-02   concatv1-01  UXDISK0  0 51200    0/0 disk_0   ENA
sd UXDISK1-01   concatv1-01  UXDISK1  0 51200    1/0 disk_1   ENA

6.Converting concatenate volume to stripe-mirror:
Here using vxassist re-layout command, we are converting existing concatenate volume to stripe-mirror.

# vxassist -g UXDG relayout concatv1 layout=stripe-mirror
bash-3.00# vxprint -hvt
Disk group: UXDG
v  concatv1  - ENABLED  ACTIVE  102400  SELECT  concatv1-01 fsgen
pl concatv1-01 concatv1  ENABLED  ACTIVE 102400  STRIPE 2/128  RW
sv concatv1-Ds01 concatv1-01 concatv1-d01 1  51200  0/0  2/2  ENA
sv concatv1-Ds02 concatv1-01 concatv1-d02 1  51200  1/0  2/2  ENA

v  concatv1-d01 - ENABLED  ACTIVE  51200  SELECT  -  fsgen
pl concatv1-dp01 concatv1-d01 ENABLED ACTIVE  51200 CONCAT  -  RW
sd UXDISK0-02  concatv1-dp01 UXDISK0 0  51200  0  disk_0  ENA
pl concatv1-dp02 concatv1-d01 ENABLED ACTIVE  51200 CONCAT  -  RW
sd UXDISK2-01  concatv1-dp02 UXDISK2 0  51200  0  disk_4  ENA

v  concatv1-d02 -  ENABLED  ACTIVE  51200  SELECT  -  fsgen
pl concatv1-dp03 concatv1-d02 ENABLED ACTIVE  51200 CONCAT  -  RW
sd UXDISK1-01  concatv1-dp03 UXDISK1 0  51200  0  disk_1  ENA
pl concatv1-dp04 concatv1-d02 ENABLED ACTIVE  51200 CONCAT  -  RW
sd UXDISK3-01  concatv1-dp04 UXDISK3 0  51200  0  disk_5  ENA

Coveting mirrored volume to concatenate volume:

To convert the volume from mirror to concatenation,just remove the mirror.
In otherwords,delete one of the plex from volume.

bash-3.00# vxprint -hvt
Disk group: UXDG
v  uxoravol1      -        ENABLED  ACTIVE  102400  SELECT  -  fsgen
pl uxoravol1-01  uxoravol1    ENABLED  ACTIVE  102400  CONCAT  -   RW
sd UXDISK1-01 uxoravol1-01 UXDISK1  0       102400   0  disk_0  ENA
pl uxoravol1-02  uxoravol1    ENABLED  ACTIVE   102400 CONCAT  -   RW
sd UXDISK2-01 uxoravol1-02 UXDISK2  0        102400 0   disk_1  ENA

Method:1

Trying to delete the plex uxoravol1-02 ,

bash-3.00# vxedit -g UXDG -rf rm uxvol2-02
VxVM vxedit ERRORV-5-1-818 Plex uxvol2-02 is associated,cannot remove

Since the plex is attached to the volume, you can’t delete it.First disassociate from the volume using the below command.

# vxplex -g UXDG dis uxvol2-02

Deleting the disassociated plex,

# vxedit -g UXDG -rf rm uxvol2-02

Method:2

In other way you can delete the plex using single command,

# vxplex -g UXDG -o rm dis  uxvol2-02
# vxprint -hvt
Disk group: UXDG
v  uxoravol1      -           ENABLED  ACTIVE  102400  SELECT  -  fsgen
pl uxoravol1-01  uxoravol1    ENABLED  ACTIVE  102400  CONCAT  -    RW
sd UXDISK1-01    uxoravol1-01 UXDISK1  0       102400   0   disk_0  ENA
bash-3.00# df -h /uxvol2
Filesystem              size   used  avail capacity  Mounted on
/dev/vx/dsk/UXDG/uxvol2 50M   3.1M    44M     7%    /uxvol2

Command Syntax:

# vxassist [-b] [-g diskgroup] relayout volume [layout=layout] \
[relayout_options]
To monitor the relayout status:

# vxrelayout status volume

In similar way you can covert other existing volume layouts to new volume layout. Refer storage foundation admin guide to find Permitted relayout transformations.

Thank you for reading this. Please leave a commend if you have any doubt. I will get back to as soon as possible.

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