Re: [Xen-devel] block-iscsi with Xen 4.5 / 4.6

[Steven Haigh <netwiz@xxxxxxxxx>]

On 15/04/2016 7:01 PM, Roger Pau Monné wrote:
> On Fri, Apr 15, 2016 at 06:20:56PM +1000, Steven Haigh wrote:
> [...]
>> I might have spoken too soon here... I updated this system to 4.6.1 and
>> created the DomU again - still seems to fail - although it does actually
>> call the block-iscsi script this time:
>>
>> # xl -vvv create /etc/xen/test1.vm
>> Parsing config from /etc/xen/test1.vm
>> libxl: debug: libxl_create.c:1560:do_domain_create: ao 0x24ad330: create:
>> how=(nil) callback=(nil) poller=0x24b7070
>> libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk
>> vdev=xvda spec.backend=unknown
>> libxl: debug: libxl_device.c:207:disk_try_backend: Disk vdev=xvda, uses
>> script=... assuming phy backend
>> libxl: debug: libxl_device.c:298:libxl__device_disk_set_backend: Disk
>> vdev=xvda, using backend phy
>> libxl: debug: libxl_create.c:945:initiate_domain_create: running bootloader
>> libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk
>> vdev=(null) spec.backend=phy
>> libxl: debug: libxl_device.c:207:disk_try_backend: Disk vdev=(null), uses
>> script=... assuming phy backend
>> libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk
>> vdev=xvde spec.backend=phy
>> libxl: debug: libxl_device.c:207:disk_try_backend: Disk vdev=xvde, uses
>> script=... assuming phy backend
>> libxl: debug: libxl_event.c:639:libxl__ev_xswatch_register: watch
>> w=0x24ada00 wpath=/local/domain/0/backend/vbd/0/51776/state token=3/0:
>> register slotnum=3
>> libxl: debug: libxl_create.c:1583:do_domain_create: ao 0x24ad330:
>> inprogress: poller=0x24b7070, flags=i
>> libxl: debug: libxl_event.c:576:watchfd_callback: watch w=0x24ada00
>> wpath=/local/domain/0/backend/vbd/0/51776/state token=3/0: event
>> epath=/local/domain/0/backend/vbd/0/51776/state
>> libxl: debug: libxl_event.c:884:devstate_callback: backend
>> /local/domain/0/backend/vbd/0/51776/state wanted state 2 still waiting state
>> 1
>> libxl: debug: libxl_event.c:576:watchfd_callback: watch w=0x24ada00
>> wpath=/local/domain/0/backend/vbd/0/51776/state token=3/0: event
>> epath=/local/domain/0/backend/vbd/0/51776/state
>> libxl: debug: libxl_event.c:880:devstate_callback: backend
>> /local/domain/0/backend/vbd/0/51776/state wanted state 2 ok
>> libxl: debug: libxl_event.c:677:libxl__ev_xswatch_deregister: watch
>> w=0x24ada00 wpath=/local/domain/0/backend/vbd/0/51776/state token=3/0:
>> deregister slotnum=3
>> libxl: debug: libxl_device.c:937:device_backend_callback: calling
>> device_backend_cleanup
>> libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch
>> w=0x24ada00: deregister unregistered
>> libxl: debug: libxl_linux.c:229:libxl__hotplug_disk: Args and environment
>> ready
>> libxl: debug: libxl_device.c:1034:device_hotplug: calling hotplug script:
>> /etc/xen/scripts/block-iscsi add
>> libxl: debug: libxl_aoutils.c:593:libxl__async_exec_start: forking to
>> execute: /etc/xen/scripts/block-iscsi add
>> libxl: error: libxl_exec.c:118:libxl_report_child_exitstatus:
>> /etc/xen/scripts/block-iscsi add [2126] exited with error status 1
>> libxl: debug: libxl_event.c:691:libxl__ev_xswatch_deregister: watch
>> w=0x24adb00: deregister unregistered
>> libxl: error: libxl_device.c:1084:device_hotplug_child_death_cb: script:
>> Device already opened
> 
> The message indicates that you have this device already opened in this 
> system, this is detected by the following check, that you can also run from 
> a shell:
> 
> # iscsiadm -m session 2>&1 | grep -q "$iqn" && fatal "Device already opened"
> 
> You will have to perform a logout in order for the hotplug script to 
> correctly attach it.

How right you are :)

# iscsiadm -m session
tcp: [1] 192.168.133.250:3260,1
iqn.1986-03.com.sun:02:ff2d12c0-b709-4ec0-999d-976506c666f5 (non-flash)

# iscsiadm -m node --targetname
iqn.1986-03.com.sun:02:ff2d12c0-b709-4ec0-999d-976506c666f5 -p
192.168.133.250 --logout
Logging out of session [sid: 1, target:
iqn.1986-03.com.sun:02:ff2d12c0-b709-4ec0-999d-976506c666f5, portal:
192.168.133.250,3260]
Logout of [sid: 1, target:
iqn.1986-03.com.sun:02:ff2d12c0-b709-4ec0-999d-976506c666f5, portal:
192.168.133.250,3260] successful.

# iscsiadm -m session
iscsiadm: No active sessions.

The DomU then started successfully. Thanks for your help.

I'll try the previously mentioned patch on 4.5 and see how I go with
that next week.

-- 
Steven Haigh

Email: netwiz@xxxxxxxxx
Web: https://www.crc.id.au
Phone: (03) 9001 6090 - 0412 935 897

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