[Xen-devel] live migration with DRBD devices

[Michael Mey <michael.mey@xxxxxx>]

Hi all,

I want to do live migration of domains using DRBD block devices for 
synchronisation between the two Xen hosts with Xen 2.0.7. 

I've written a script ( block-drbd ) which binds / unbinds DRBD devices for 
specific domains (with DRBD, only one host can write on a drbd device at the 
same time). This script sets the current host as master (bind) or secondary 
(unbind) in a DRBD "Netword-RAID"

Bringing up a domain works fine. But when I try to migrate it ( live with -l 
flag as well as non-live) I get an error from xfrd. 
The xfrd.log says:


==> xfrd.log <==
2508 [INF] XFRD> Accepted connection from 127.0.0.1:1327 on 2
2790 [INF] XFRD> Xfr service for 127.0.0.1:1327
[DEBUG] Conn_init> flags=1
[DEBUG] Conn_init> write stream...
[DEBUG] stream_init>mode=w flags=1 compress=0
[DEBUG] stream_init> unbuffer...
[DEBUG] stream_init< err=0
[DEBUG] Conn_init> read stream...
[DEBUG] stream_init>mode=r flags=1 compress=0
[DEBUG] stream_init> unbuffer...
[DEBUG] stream_init< err=0
[DEBUG] Conn_sxpr>
(xfr.hello 1 0)[DEBUG] Conn_sxpr< err=0
[DEBUG] Conn_sxpr>
(xfr.migrate 8 "(domain (id 8) (name Xen0) (memory 511) (maxmem 512) (state 
-b---) (cpu 0) (cpu_time 7.548731537) (up_time 1953.19617701) (start_time 
1130242370.96) (console (status listening) (id 12) (domain 8) (local_port 12) 
(remote_port 1) (console_port 9608)) (devices (vif (idx 0) (vif 0) (mac 
aa:00:00:00:42:00) (vifname vif8.0) (bridge xen-br0) (evtchn 14 4) (index 0)) 
(vbd (idx 0) (vdev 769) (device 37632) (mode w) (dev hda1) (uname drbd:drbd0) 
(node /dev/drbd0) (index 0)) (vbd (idx 1) (vdev 770) (device 37633) (mode w) 
(dev hda2) (uname drbd:drbd1) (node /dev/drbd1) (index 1))) (config (vm (name 
Xen0) (memory 512) (image (linux (kernel /boot/vmlinuz-2.6.11.10-xenU) (root 
'/dev/hda1 ro'))) (device (vbd (uname drbd:drbd0) (dev hda1) (mode w))) 
(device (vbd (uname drbd:drbd1) (dev hda2) (mode w))) (device (vif (mac 
aa:00:00:00:42:00) (bridge xen-br0))))))" testpc-023 8002 1 0)[DEBUG] 
Conn_sxpr< err=0
[DEBUG] Conn_connect> addr=192.168.111.23:8002
[DEBUG] Conn_init> flags=1
[DEBUG] Conn_init> write stream...
[DEBUG] stream_init>mode=w flags=1 compress=0
[DEBUG] stream_init> unbuffer...
[DEBUG] stream_init< err=0
[DEBUG] Conn_init> read stream...
[DEBUG] stream_init>mode=r flags=1 compress=0
[DEBUG] stream_init> unbuffer...
[DEBUG] stream_init< err=0
[DEBUG] Conn_sxpr>
(xfr.err 0)[DEBUG] Conn_sxpr< err=0

[1130244324.172538] xc_linux_save start 8

xc_linux_save start 8
[1130244324.174077] Saving memory pages: iter 1   0%
Saving memory pages: iter 1   0%Error when writing to state file (5)
Error when writing to state file (5)
2790 [WRN] XFRD> Transfer errors:
2790 [WRN] XFRD> state=XFR_STATE    err=1
2790 [INF] XFRD> Xfr service err=1


Does anybody have an idea? I'd appreciate.

Cheers,
Mike

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