[Xen-users] drbd, xen and disk not accessible..

["Marco Strullato" <marco.strullato@xxxxxxxxx>]

Hi all,
I set up two systems with centos5 64 bit, xen 3.2 (rebuit from src.rpm), drbd.
At first I installed a centos4.5 32 bit using the device /dev/drbd0
(is it possible to use the drbd resource at this step?) and then I
dump the configuration, I changed the driver name, source dev and I
added the kernel, ramdisk and root parameters.

This is my configuration xml

<domain type='xen' id='-1'>
  <name>SLSPTEST</name>
  <uuid>10147595b176607d804d0e1dc1d2103d</uuid>
  <bootloader>/usr/bin/pygrub</bootloader>
  <os>
    <type>linux</type>
  </os>
  <memory>2097152</memory>
  <vcpu>1</vcpu>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <interface type='bridge'>
      <source bridge='xenbr0'/>
      <mac address='00:16:3e:44:d3:9b'/>
    </interface>
    <disk type='block' device='disk'>
      <driver name='drbd'/>
      <source dev='r0'/>
      <target dev='xvda'/>
    </disk>
  </devices>
  <kernel>/boot/vmlinuz-2.6.9-67.0.7.ELxenU</kernel>
  <ramdisk>/boot/initrd-2.6.9-67.0.7.ELxenU.img</ramdisk>
  <root>ro root=/dev/VolGroup00/LogVol00 console=xvc0 selinux=0</root>
</domain>

The drbd configuration is:

global {
        usage-count yes;
 }
common {
        protocol C;
        disk {
                on-io-error detach;
        }
        syncer {
                verify-alg md5;
                rate 50M;
        }

}
resource r0 {
        startup {
                become-primary-on both;
        }
        net {
                allow-two-primaries;
        }
        on hyp11.infolan {
                device     /dev/drbd0;
                disk       /dev/HYP11VM/VMNAME;
                address    10.100.0.2:7788;
                meta-disk  internal;
        }
        on hyp10.infolan {
                device    /dev/drbd0;
                disk      /dev/HYP10VM/VMNAME;
                address   10.100.0.1:7788;
                meta-disk internal;
        }
}


Everythig seems to be ready: I loaded the configuration file
successfully with virsh define SLSPTEST and the drbd resource is set
up according to the drdb guide (dual primary mode enabled).

[root@hyp10 scripts]# cat /proc/drbd
version: 8.2.5 (api:88/proto:86-88)
GIT-hash: 9faf052fdae5ef0c61b4d03890e2d2eab550610c build by
buildsvn@c5-x8664-build, 2008-03-09 10:16:12
 0: cs:Connected st:Primary/Primary ds:UpToDate/UpToDate C r---
    ns:12539333 nr:0 dw:1005385 dr:11578691 al:558 bm:704 lo:0 pe:0 ua:0 ap:0
        resync: used:0/31 hits:720168 misses:704 starving:0 dirty:0 changed:704
        act_log: used:0/127 hits:272661 misses:558 starving:0 dirty:0
changed:558

Unluckly when I execute xm start SLSPTEST I get

Error: Disk isn't accessible

The xend log is

2008-04-24 16:36:56 8572] ERROR (XendBootloader:43) Disk isn't accessible
[2008-04-24 16:36:56 8572] ERROR (XendDomainInfo:440) VM start failed
Traceback (most recent call last):
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 420, in start
    XendTask.log_progress(31, 60, self._initDomain)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendTask.py", line
209, in log_progress
    retval = func(*args, **kwds)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 1694, in _initDomain
    self._configureBootloader()
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 2050, in _configureBootloa
der
    bootloader_args, kernel, ramdisk, args)
  File "/usr/lib64/python2.4/site-packages/xen/xend/XendBootloader.py",
line 44, in bootloader
    raise VmError(msg)
VmError: Disk isn't accessible
[2008-04-24 16:36:56 8572] DEBUG (XendDomainInfo:1883)
XendDomainInfo.destroy: domid=12
[2008-04-24 16:36:56 8572] DEBUG (XendDomainInfo:1900)
XendDomainInfo.destroyDomain(12)
[2008-04-24 16:36:56 8572] DEBUG (XendDomainInfo:1524) No device model
[2008-04-24 16:36:56 8572] DEBUG (XendDomainInfo:1526) Releasing devices


How could I solve this problem? I want to use the suggested
configuration using the drbd driver but it does't work.


Thanks

Marco

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