[Xen-users] tap:aio not working...

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

I'm running SLES10 SP1 and have been using file:/ for my file-backed domUs.  
The domUs sit on a shared OCFS2 SAN-backed filesystem and are run on my three 
or four XEN servers.  I'm having issues with the loopback devices not being 
released when the domUs shutdown or migrate, so I decided to switch over to 
tap:aio for my file-backed domUs.  This isn't working, either.  Whereas the 
domUs with file: at least boot and run, the domUs with tap:aio: fail with this 
error:
 
Error: Device 51952 (vbd) could not be connected. Hotplug scripts not working.
 
I've searched the mailing lists and been through all the udev issues, and none 
of those seem to apply - my loop devices and vifs are connecting perfectly 
fine, just these tap:aio devices that won't work.  I've also verified that 
blktap and xenblk are loaded as modules.  I 
used udevmonitor to track what happens when I start domUs with tap:aio vs. file 
(loop) disks.  Here's file method:
 
UEVENT[1209507940.668013] add@/block/dm-30
UEVENT[1209507940.668040] offline@/block/dm-30
UEVENT[1209507940.668049] online@/block/dm-30
UEVENT[1209507940.668059] add@/block/dm-31
UEVENT[1209507940.668067] offline@/block/dm-31
UEVENT[1209507940.668074] online@/block/dm-31
UDEV  [1209507940.895265] add@/block/dm-31
UDEV  [1209507940.896125] offline@/block/dm-31
UDEV  [1209507940.949818] online@/block/dm-31
UDEV  [1209507940.951980] add@/block/dm-30
UDEV  [1209507940.952814] offline@/block/dm-30
UEVENT[1209507940.962962] mount@/block/dm-30
UDEV  [1209507940.979895] online@/block/dm-30
UDEV  [1209507940.980777] mount@/block/dm-30
UEVENT[1209507941.415122] umount@/block/dm-30
UDEV  [1209507941.415413] umount@/block/dm-30
UEVENT[1209507941.421063] remove@/block/dm-30
UEVENT[1209507941.422222] remove@/block/dm-31
UDEV  [1209507941.422598] remove@/block/dm-30
UDEV  [1209507941.423304] remove@/block/dm-31
UEVENT[1209507942.248473] add@/devices/xen-backend/vkbd-15-0
UDEV  [1209507942.248767] add@/devices/xen-backend/vkbd-15-0
UEVENT[1209507942.255938] add@/devices/xen-backend/vfb-15-0
UDEV  [1209507942.256133] add@/devices/xen-backend/vfb-15-0
UEVENT[1209507942.272675] add@/devices/xen-backend/vbd-15-51712
UEVENT[1209507942.297785] add@/devices/xen-backend/vif-15-0
UDEV  [1209507942.298036] add@/devices/xen-backend/vif-15-0
UEVENT[1209507942.301038] add@/class/net/vif15.0 
UEVENT[1209507942.301052] online@/devices/xen-backend/vif-15-0
UEVENT[1209507942.374108] add@/devices/xen-backend/console-15-0
UDEV  [1209507942.374558] add@/devices/xen-backend/console-15-0
UDEV  [1209507942.404498] online@/devices/xen-backend/vif-15-0
UDEV  [1209507942.459501] add@/class/net/vif15.0 
UDEV  [1209507942.616792] add@/devices/xen-backend/vbd-15-51712
and here's tap:aio method:
UEVENT[1209507805.006622] add@/devices/xen-backend/vbd-0-51952
UEVENT[1209507805.007163] add@/devices/xen/vbd-51952
UDEV  [1209507805.007937] add@/devices/xen/vbd-51952
UDEV  [1209507805.042766] add@/devices/xen-backend/vbd-0-51952
UEVENT[1209507905.016513] remove@/devices/xen-backend/vbd-0-51952
UEVENT[1209507905.067583] remove@/devices/xen/vbd-51952
UDEV  [1209507905.067852] remove@/devices/xen/vbd-51952
UDEV  [1209507905.078662] remove@/devices/xen-backend/vbd-0-51952
 
syslog messages are unhelpful - here's the output when I try with tap:aio:
Apr 29 16:55:02 xen02 kernel: blkback: ring-ref 8, event-channel 38, protocol 1 
(x86_64-abi)
Apr 29 16:55:02 xen02 kernel: blkback: ring-ref 8, event-channel 38, protocol 1 
(x86_64-abi)
Apr 29 16:55:02 xen02 logger: /etc/xen/scripts/block: add 
XENBUS_PATH=backend/vbd/0/51952
Apr 29 16:56:42 xen02 logger: /etc/xen/scripts/block: remove 
XENBUS_PATH=backend/vbd/0/51952
Apr 29 16:56:43 xen02 logger: /etc/xen/scripts/xen-hotplug-cleanup: 
XENBUS_PATH=backend/vbd/0/51952
 
Anyone have any hints as to what might be going on here?  Any possible 
solutions?
 
Thanks,
Nick
 
P.S. - FWIW, it doesn't seem to make a difference whether the files are local 
vs. SAN as to whether tap:aio works or not.



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