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

["Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>]

Marco Strullato wrote:
> 
> 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.

Marco,

When you do an 'rpm -qa | grep xen' does it show both
xen-3.2.0 and xen-libs-3.2.0 as installed? They should
be given the dependencies. If so then I would ask on
the drbd list why their drbd type doesn't work as
shown on their wiki. Maybe it was excluded from Xen
and when they wrote the wiki page they were hoping it
would have been adopted.

It doesn't really matter anyways, because listing the
device as phy:drbd0 would give you the exact same
result, which is attach xenblk on the backend.


-Ross

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