Hi,
I''m trying to migrate a VM between two machines using a DRBD device.
Sometimes it works, and sometimes it doesn''t .. can anyone give me any
clues as to why this might be?
When it doesn''t, this is what xentop shows me on the target;
x entop - 12:49:22 Xen 3.2.0
2 domains: 1 running, 1 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 6290816k total, 6129364k used, 161452k free CPUs: 4 @ 2800MHz
NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k)
NETRX(k) VBDS VBD_OO VBD_RD VBD_WR SSID
dhcp --b--- 0 0.0 131072 2.1 131072 2.1 1 1 3 16 1 0 0 0 2149622432
Domain-0 -----r 2189 0.2 5892096 93.7 no limit n/a 4 0 0 0 0 0 0 0 21496224
Effectively it doesn''t look like it''s able to connect up the
device.
However, /proc/drbd confirms that the block-drbd script on each machine has
succeeded.
(i.e. primary/secondary are successfully reversed)
My drbd.conf;
----------------------------------
global {
usage-count no;
}
common {
syncer { rate 10M; }
}
resource dhcp {
protocol C;
startup {
wfc-timeout 120;
degr-wfc-timeout 120;
}
disk {
on-io-error detach;
}
net {
allow-two-primaries;
after-sb-0pri discard-zero-changes;
after-sb-1pri discard-secondary;
max-buffers 128;
}
syncer {
rate 10M;
#after "something else";
al-extents 257;
}
on nodea {
device /dev/drbd0;
disk /dev/local/dhcp;
address 10.0.0.1:7788;
flexible-meta-disk internal;
}
on nodeb {
device /dev/drbd0;
disk /dev/local/dhcp;
address 10.0.0.2:7788;
meta-disk internal;
}
}
----------
my instance.cnf;
kernel = ''/boot/vmlinuz-2.6.21-prep''
ramdisk = ''/boot/initrd.img-2.6.21-prep''
disk = [ ''drbd:dhcp,xvda,w'' ]
vif = [ ''ip=10.0.0.23,mac=00:00:10:00:00:23,bridge=eth0'' ]
root = ''/dev/xvda ro''
name = ''dhcp''
on_poweroff = ''destroy''
on_reboot = ''restart''
on_crash = ''restart''
serial_device = ''xvc0''
memory = ''128''
vcpus = ''1''
cpus = ''0-1''
extra = ''clock=jiffies selinux=0''
Any ideas gratefully accepted!
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