[Xen-devel] Migrating a 32 bit DomU from a 64 bit machine to a 32 bit machine?

["sanjay kushwaha" <sanjay.kushwaha@xxxxxxxxx>]

Hi Folks,
I am trying to live migrate a 32 bit linux DomU from a 64-bit machine running 64-bit dom0 to a 32 bit machine running 32-bit dom0.
Apparently the live migration fails with the following error.

[root@vt3 xen]# xm migrate --live 1 143.215.138.73
Error: /usr/lib64/xen/bin/xc_save 23 1 0 0 1 failed
Usage: xm migrate <Domain> <Host>

Migrate a domain to another machine.

Options:

-h, --help           Print this help.
-l, --live           Use live migration.
-p=portnum, --port=portnum
                     Use specified port for migration.
-n=nodenum, --node=nodenum
                     Use specified NUMA node on target.
-r=MBIT, --resource=MBIT
                     Set level of resource usage for migration.

[root@vt3 xen]#

The /var/log/xend.log say the following

[2008-04-28 20:49:00 6254] DEBUG (XendCheckpoint:105) [xc_save]: /usr/lib64/xen/bin/xc_save 23 1 0 0 1
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) domctl ret 0
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) domctl ret 0
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) domctl ret 0
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) domctl ret 0
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) Had 0 unexplained entries in p2m table
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) domctl ret 0
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) domctl ret 0
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) Saving memory pages: iter 1   0%domctl ret 0
[2008-04-28 20:49:00 6254] INFO (XendCheckpoint:411) domctl ret 0
[2008-04-28 20:49:24 6254] INFO (XendCheckpoint:411) ERROR Internal error: Error when writing to state file (4a) (errno 104)
[2008-04-28 20:49:24 6254] INFO (XendCheckpoint:411) domctl ret 0
[2008-04-28 20:49:24 6254] INFO (XendCheckpoint:411) Save exit rc=1
[2008-04-28 20:49:24 6254] ERROR (XendCheckpoint:158) Save failed on domain DebianVM (1).
Traceback (most recent call last):
  File "//usr/lib64/python/xen/xend/XendCheckpoint.py", line 126, in save
    forkHelper(cmd, fd, saveInputHandler, False)
  File "//usr/lib64/python/xen/xend/XendCheckpoint.py", line 399, in forkHelper
    raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib64/xen/bin/xc_save 23 1 0 0 1 failed

Could someone please let me know if it is possible to migrate VMs between 64 bit and 32 bit machines? I am using the latest xen tree.

Thanks,
Sanjay

-- 
----------------------
PhD Candidate, Georgia Tech
http://www.cc.gatech.edu/~ksanjay/
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