Re: handling local attach of phy disks for pygrub (Was: Xen 4.3 xl migrate " htree_dirblock_to_tree" on second host)

["Roger Pau Monné" <roger.pau@citrix.com>]

On 13/02/14 02:29, Miguel Clara wrote:
> I tried the patch provided by roger, I get a different error now:
> 
> Parsing config from test.cfg
> libxl: error: libxl_device.c:1127:libxl__wait_for_backend: Backend
> /local/domain/0/backend/vbd/0/51712 not ready
> libxl: error: libxl_bootloader.c:405:bootloader_disk_attached_cb:
> failed to attach local disk for bootloader execution
> libxl: error: libxl_bootloader.c:276:bootloader_local_detached_cb:
> unable to detach locally attached disk
> libxl: error: libxl_create.c:900:domcreate_rebuild_done: cannot
> (re-)build domain: -1
> 
> 
> with -vvv
> 
> # xl -vvv create test.cfg
> Parsing config from test.cfg
> libxl: debug: libxl_create.c:1230:do_domain_create: ao 0x12548c0:
> create: how=(nil) callback=(nil) poller=0x1254980
> libxl: debug: libxl_device.c:257:libxl__device_disk_set_backend: Disk
> vdev=xvda spec.backend=unknown
> libxl: debug: libxl_device.c:188:disk_try_backend: Disk vdev=xvda,
> uses script=... assuming phy backend
> libxl: debug: libxl_device.c:296:libxl__device_disk_set_backend: Disk
> vdev=xvda, using backend phy
> libxl: debug: libxl_create.c:675:initiate_domain_create: running bootloader
> libxl: debug: libxl_device.c:257:libxl__device_disk_set_backend: Disk
> vdev=(null) spec.backend=phy
> libxl: debug: libxl_device.c:188:disk_try_backend: Disk vdev=(null),
> uses script=... assuming phy backend
> libxl: debug: libxl.c:2605:libxl__device_disk_local_initiate_attach:
> trying to locally attach PHY device drbd-remus-test with script
> block-drbd
> libxl: debug: libxl_device.c:257:libxl__device_disk_set_backend: Disk
> vdev=xvdf spec.backend=phy
> libxl: debug: libxl_device.c:188:disk_try_backend: Disk vdev=xvdf,
> uses script=... assuming phy backend
> libxl: debug: libxl_event.c:559:libxl__ev_xswatch_register: watch
> w=0x124a300 wpath=/local/domain/0/backend/vbd/0/51792/state token=3/0:
> register slotnum=3
> libxl: debug: libxl_create.c:1243:do_domain_create: ao 0x12548c0:
> inprogress: poller=0x1254980, flags=i
> libxl: debug: libxl_event.c:503:watchfd_callback: watch w=0x124a300
> wpath=/local/domain/0/backend/vbd/0/51792/state token=3/0: event
> epath=/local/domain/0/backend/vbd/0/51792/state
> libxl: debug: libxl_event.c:647:devstate_watch_callback: backend
> /local/domain/0/backend/vbd/0/51792/state wanted state 2 still waiting
> state 1
> libxl: debug: libxl_event.c:503:watchfd_callback: watch w=0x124a300
> wpath=/local/domain/0/backend/vbd/0/51792/state token=3/0: event
> epath=/local/domain/0/backend/vbd/0/51792/state
> libxl: debug: libxl_event.c:643:devstate_watch_callback: backend
> /local/domain/0/backend/vbd/0/51792/state wanted state 2 ok
> libxl: debug: libxl_event.c:596:libxl__ev_xswatch_deregister: watch
> w=0x124a300 wpath=/local/domain/0/backend/vbd/0/51792/state token=3/0:
> deregister slotnum=3
> libxl: debug: libxl_event.c:608:libxl__ev_xswatch_deregister: watch
> w=0x124a300: deregister unregistered
> libxl: debug: libxl_device.c:959:device_hotplug: calling hotplug
> script: /etc/xen/scripts/block-drbd add
> libxl: debug: libxl.c:2692:local_device_attach_cb: locally attached
> disk /dev/xvdf
> libxl: error: libxl_device.c:1127:libxl__wait_for_backend: Backend
> /local/domain/0/backend/vbd/0/51792 not ready

So the local attach seems to DTRT, but the device never gets to state 4
(connected). Does the block-drbd script work with guests that are not
using pygrub? (extract the kernel from the DomU and use it directly on
the config file).

Roger.