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

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

Marco Strullato wrote:
> 
> Hi all, I have a problem with drbd and xen.
> After setting up drbd and after I installed a new linux vm, I 
> can not create the vm because of a problem accessing the disk.
> I read that a solution could be setting the kernel and 
> ramdisk and root parameter into the vm config file but it 
> doesn't work for me.
> 
> What do you suggest me?
> 
> I get:
> Using config file "/etc/xen/VMNAME".
> No handlers could be found for logger "xend"
> Error: Disk isn't accessible
> Usage: xm create <ConfigFile> [options] [vars]
> ...
> 
> I'm using this packages:
> xen-3.0.3-41.el5
> kernel-xen-2.6.18-8.el5
> kmod-drbd82-xen-8.2.5-1.2.6.18_53.1.14.el5
> xen-libs-3.0.3-41.el5
> xen-libs-3.0.3-41.el5
> kernel-xen-2.6.18-53.1.14.el5
> drbd82-8.2.5-1.el5.centos
> kmod-drbd82-xen-8.2.5-1.2.6.18_53.1.14.el5
> 
> my drbd.conf is:
> global {
>         usage-count yes;
>  }
> common {
>         protocol C;
>         startup {
>                 become-primary-on both;
>         }
>         net {
>                 allow-two-primaries;
>         }
>         disk {
>                 on-io-error detach;
>         }
>         syncer {
>                 verify-alg md5;
>                 rate 50M;
>         }
> 
> }
> resource r0 { 
>         on hyp11.infolan {
>                 device     /dev/drbd0;
>                 disk       /dev/HYP11VM/INT;
>                 address    10.100.0.2:7788;
>                 meta-disk  internal;
>         }
>         on hyp10.infolan {
>                 device    /dev/drbd0;
>                 disk      /dev/HYP10VM/INT;
>                 address   10.100.0.1:7788;
>                 meta-disk internal;
>         }
> }
> 
> and the vm configuration file is:
> name = "VMNAME"
> uuid = "8f1e2a13-f0c1-fbf5-a1f2-2a71f8c7c144"
> maxmem = 512
> memory = 512
> vcpus = 1
> bootloader = "/usr/bin/pygrub"
> on_poweroff = "destroy"
> on_reboot = "restart"
> on_crash = "restart"
> vfb = [  ]
> disk = [ "drbd:r0,xvda,w" ]
            ^^^^^^^
Where did you get this config info from, as far as I
know it should be:

disk = [ "phy:drbd0,xvda,w" ]

> vif = [ "mac=00:16:3e:60:7d:41,bridge=xenbr0" ]
> kernel='/boot/vmlinuz-2.6.9-67.0.7.ELxenU'
> ramdisk='/boot/initrd-2.6.9-67.0.7.ELxenU.img'  
> root='/dev/VolGroup00/LogVol00 ro'

Setting drbd resources per-lv will become very messy
over time as the number of guests increase. I advise
replicating PVs between hosts and adding the drbdX
resources to shared VGs. If you maintain all your
VMs in xenstore then the VM config should migrate
between machines so you don't need to have the VM
config present on both machines beforehand and
therefore you will not be able to start the same
VM on 2 machines at once and therefore shouldn't
need to run CLVM which would get in the way of VM
migration.


-Ross

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