Hello list!
I try to move all logical volumes which reside on a minidisk
(/dev/dasdd1) on DASD MOD9 to a minidisk (/dev/dasde1) on DASD MOD54.
"/" and "/boot" reside on separate minidisks, the rest is LVM managed.
I can reproduce the problem with a test system:
zlinux:~ # df -h
Filesystem Size Used Avail Use% Mounted on
/dev/dasdc1 879M 113M 767M 13% /
udev 247M 108K 247M 1% /dev
/dev/dasdb1 45M 13M 30M 31% /boot
/dev/mapper/system-lvhome
492M 33M 460M 7% /home
/dev/mapper/system-lvopt
656M 35M 622M 6% /opt
/dev/mapper/system-lvtmp
368M 33M 336M 9% /tmp
/dev/mapper/system-lvusr
1.2G 563M 606M 49% /usr
/dev/mapper/system-lvvar
876M 81M 796M 10% /var
zlinux:~ # pvscan
PV /dev/dasdd1 VG system lvm2 [4.57 GB / 1.09 GB free]
PV /dev/dasde1 VG system lvm2 [4.80 GB / 4.80 GB free]
zlinux:~ # pvmove -v /dev/dasdd1
Wiping cache of LVM-capable devices
Finding volume group "system"
Archiving volume group "system" metadata (seqno 7).
Creating logical volume pvmove0
Executing: /sbin/modprobe dm-mirror
Moving 292 extents of logical volume system/lvusr
Moving 219 extents of logical volume system/lvvar
Moving 164 extents of logical volume system/lvopt
Moving 123 extents of logical volume system/lvhome
Moving 92 extents of logical volume system/lvtmp
Found volume group "system"
Found volume group "system"
Found volume group "system"
Found volume group "system"
Found volume group "system"
Updating volume group metadata
Creating volume group backup "/etc/lvm/backup/system" (seqno 8).
Found volume group "system"
Found volume group "system"
Suspending system-lvusr (253:0)
Found volume group "system"
Found volume group "system"
Suspending system-lvvar (253:1)
Found volume group "system"
Found volume group "system"
Suspending system-lvopt (253:2)
Found volume group "system"
Found volume group "system"
Suspending system-lvhome (253:3)
Found volume group "system"
Found volume group "system"
Suspending system-lvtmp (253:4)
Found volume group "system"
Creating system-pvmove0
Loading system-pvmove0 table
Resuming system-pvmove0 (253:5)
system-pvmove0: device not found
Found volume group "system"
Loading system-pvmove0 table
Suppressed system-pvmove0 identical table reload.
Loading system-lvusr table
Resuming system-lvusr (253:0)
Found volume group "system"
Loading system-pvmove0 table
Suppressed system-pvmove0 identical table reload.
Loading system-lvvar table
Resuming system-lvvar (253:1)
Found volume group "system"
Loading system-pvmove0 table
Suppressed system-pvmove0 identical table reload.
Loading system-lvopt table
Resuming system-lvopt (253:2)
Found volume group "system"
Loading system-pvmove0 table
Suppressed system-pvmove0 identical table reload.
Loading system-lvhome table
Resuming system-lvhome (253:3)
Found volume group "system"
Loading system-pvmove0 table
Suppressed system-pvmove0 identical table reload.
Loading system-lvtmp table
Resuming system-lvtmp (253:4)
Checking progress every 15 seconds
/dev/dasdd1: Moved: 5.5%
/dev/dasdd1: Moved: 10.8%
/dev/dasdd1: Moved: 16.1%
/dev/dasdd1: Moved: 21.3%
/dev/dasdd1: Moved: 26.5%
/dev/dasdd1: Moved: 31.9%
/dev/dasdd1: Moved: 32.8%
Updating volume group metadata
Creating volume group backup "/etc/lvm/backup/system" (seqno 9).
Found volume group "system"
Found volume group "system"
Suspending system-lvusr (253:0)
Suspending system-pvmove0 (253:5)
Found volume group "system"
Found volume group "system"
Suspending system-lvvar (253:1)
Found volume group "system"
Found volume group "system"
Suspending system-lvopt (253:2)
Found volume group "system"
Found volume group "system"
Suspending system-lvhome (253:3)
Found volume group "system"
Found volume group "system"
Suspending system-lvtmp (253:4)
Found volume group "system"
Found volume group "system"
Found volume group "system"
Loading system-pvmove0 table
Resuming system-pvmove0 (253:5)
(here the output stops)
Now the system freezes slowly: sshd still gives a login-prompt, but if
I enter the password no login is possible. Other open ssh sessions
freeze are working until I enter a command. After a few minutes sshd
doesn't answer any more. If I reboot the system it doesn't comes up,
because the pvmove is restartet during the boot and the system freezes
again.
I can rescue the system with a few steps: IPL into CMS, detach a LVM
managed minidisk, boot the guest which doesn't comes up ("Give root
password to login"), edit the fstab with "ed" and delete all mounts
with LVM volumes, attach the minidisk again and reboot. The system
comes up and pvmove starts to work again: "(lvm2copyd) -a y" After
pvmove is ready I replace the fstab with its original and reboot.
Voila, here we go again.
But I want to move my productional systems without a big downtime. Any ideas?
System info:
SuSE Linux Enterprise Server 10
zlinux:~ # SPident
CONCLUSION: System is up-to-date!
found SLE-10-s390x-SP2
z/VM 5.3
Thank you in advance.
Sebastian
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