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[linux-lvm] Linux ppc64:lvm command 'pvmove' is not getting completed when more than 4 extends are moved



Hi Linux-Lvm

I am facing a problem with pvmove command of LVM on RHEL4U3 on PPC64 architecture. pvmove command is never exiting when I try to issue move for more than 4 extents.
Is this a bug with RHEL on PPC64??
If not is there any work around ??

I have posted this issue in RH issue tracker #109657 Summary: Linux ppc64:lvm command 'pvmove' is not getting completed when more than 4 extends are moved


pvmove --alloc     anywhere     /dev/sdb3:0-4     /dev/sdb3:256-267
 /dev/sdb3: Moved: 80.0%
 /dev/sdb3: Moved: 80.0%
 /dev/sdb3: Moved: 80.0%
 /dev/sdb3: Moved: 80.0%

The above message is displayed for infinitely and pvmove never completes.
This happens for moving 5 or more than 5 extents.
pvmove is successful for 4 or below 4 extents movement.

Configuration
================

OS : RHEL4 UP3
Architecture : PPC64
uname -a : Linux lopgod04.vxindia.veritas.com 2.6.9-34.ELv #1 SMP Mon Sep 25 13:31:34 BST 2006 ppc64 ppc64 ppc64 GNU/Linux
Internal disk of size 73GB (sdb)  : using sdb3 for the LVM operations

I am using sdb which is not boot disk ( I have sda as boot disk in my setup)

fdisk -l /dev/sdb

Disk /dev/sdb: 73.4 GB, 73407488000 bytes
128 heads, 32 sectors/track, 35003 cylinders
Units = cylinders of 4096 * 512 = 2097152 bytes

  Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1           1         172+  41  PPC PReP Boot
Partition 1 does not end on cylinder boundary.
/dev/sdb2               7        2007     4098048   82  Linux swap
/dev/sdb3            2010        6778     9766912   83  Linux
/dev/sdb4            6800       11568     9766912    5  Extended

Steps that caused the above problem
========================================

1. Created partition on /dev/sdb named /dev/sdb3 or size 10G between 2010 and 6778 as above

2.  pvcreate /dev/sdb3
   vgcreate  lopvg4 /dev/sdb3
   lvcreate -L 5G -n loplv4 lopvg4
3. lvdisplay --map

--- Logical volume ---
 LV Name                /dev/lopvg4/loplv4
 VG Name                lopvg4
 LV UUID                62ZATJ-IMKa-xmOk-kmOG-f5LG-Dle8-1Ksaur
 LV Write Access        read/write
 LV Status              available
 # open                 0
 LV Size                5.00 GB
 Current LE             1280
 Segments               1
 Allocation             inherit
 Read ahead sectors     0
 Block device           253:0
--- Segments ---
 Logical extent 0 to 1279:
   Type                linear
   Physical volume     /dev/sdb3
   Physical extents    0 to 1279


4.  Moving 5 extents using pvmove


pvmove --alloc anywhere /dev/sdb3:0-4 /dev/sdb3:1290-1294
 /dev/sdb3: Moved: 80.0%
 /dev/sdb3: Moved: 80.0%
 /dev/sdb3: Moved: 80.0%

The above message is displayed for infinitely and pvmove never completes.
   This happens only for moving 4 or above 4 number of extents ..

5. pvmode is successful for moving 4 or less extents as below
  pvmove --alloc anywhere /dev/sdb3:0-3 /dev/sdb3:1290-1293
 /dev/sdb3: Moved: 100.0%

 lvdisplay --map
 --- Logical volume ---
 LV Name                /dev/lopvg4/loplv4
 VG Name                lopvg4
 LV UUID                62ZATJ-IMKa-xmOk-kmOG-f5LG-Dle8-1Ksaur
 LV Write Access        read/write
 LV Status              available
 # open                 0
 LV Size                5.00 GB
 Current LE             1280
 Segments               2
 Allocation             inherit
 Read ahead sectors     0
 Block device           253:0
--- Segments ---
 Logical extent 0 to 3:
   Type                linear
   Physical volume     /dev/sdb3
   Physical extents    1290 to 1293
Logical extent 4 to 1279:
   Type                linear
   Physical volume     /dev/sdb3
   Physical extents    4 to 1279

Thanks and Regards
Sudhakar Kasina
Symantec Corporation (Veritas)
Pune - India


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