How to relayout a volume with vxassist, and reverse it if required

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Article ID: 100021556

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Resolution

Syntax:
# vxassist -g relayout layout=
 

Example to relayout from a stripe volume to RAID5:
 
# vxassist -g datadg relayout vol01 layout=raid

Monitor the relayout process using two following vxtask, and vxrelayout commands below:
 
# vxtask -l list
Task: 391 RUNNING
Type: RDWRBACK  ß notice this value
Operation: VOLSTART Vol vol01-T01
Started: Wed Oct 29 14:50:09 2003
Throttle: 0
Progress: 21.31% 21824 of 102400 Blocks
Work time: 2 seconds (0:07 remaining)
 

# vxrelayout status vol01
STRIPED,  columns=2,  stwidth=128 -->  RAID5,  columns=2,  stwidth=32  ß Notice here: Striped à RAID5
Relayout stopped,  0.00% completed.  ß and the relayout hasn't yet started


# vxtask -l list
Task: 393 RUNNING
Type: RELAYOUT  ß  now the relayout is in progress
Operation: RELAYOUT Vol vol01
Started: Wed Oct 29 14:50:18 2003
Throttle: 0
Progress: 2.77% 56792 of 2048000 Blocks
Work time: 11 seconds (06:25 remaining)
 


# vxrelayout status vol01
STRIPED,  columns=2,  stwidth=128 -->  RAID5,  columns=2,  stwidth=32
Relayout running,  0.00% completed.  ß and here, relayout shows it's now running


To reverse the relayout

Syntax:
# vxtask abort taskid
 

Example:

# vxtask abort 393
# vxvm:vxrelayout: INFO: Aborting readloop (task 393)
vxvm:vxrelayout: INFO: Attempting to cleanup ...
vxvm:vxassist: ERROR: Cannot complete relayout operation

[1]+  Exit 7                  vxassist -g datadg relayout vol01 layout=raid


# vxtask -l list
#

# vxrelayout status vol01
STRIPED,  columns=2,  stwidth=128 -->  RAID5,  columns=2,  stwidth=32
Relayout stopped,  30.00% completed.  ß relayout has stopped
 
Reverse the relayout : 

# vxrelayout reverse vol01&
[1] 5632

# vxtask -l list
Task: 401 RUNNING
Type: RELAYOUT
Operation: RELAYOUT Vol vol01
Started: Wed Oct 29 15:03:49 2003
Throttle: 0
Progress: 14.84% 106368 of 716800 Blocks
Work time: 5 seconds (0:28 remaining)
 
# vxrelayout status vol01
RAID5,  columns=2,  stwidth=32 -->  STRIPED,  columns=2,  stwidth=128 ß Notice this line
Relayout running,  70.00% completed.          It shows relayout reversal: RAID5 à STRIPED
 

 

 

 

 

 

Issue/Introduction

How to relayout a volume with vxassist, and reverse it if required.
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