[Xen-users] [Xen-bugs] [Bug 892] [SR]xm restore fail for hvm domain after dom0 is re

[Heiko Lehmann <hlehmann@xxxxxxxxxxxxx>]

...information only...(not a call)

Hallo fan.zhao!

I do not have a solution for this problem.
But i have a similary problem.
(see my memo)

regards Heiko


---------------------------------------------------------------------


problem:
- after reboot xenhost, any VMs (Win2k, full virtualized)
  cannot complete restored.

details:
- xenhost != workstation
- the VMs was created with "sdl=1" and DISPLAY=$myhost:0
- start xenhost will exec "xendomains start",
  without defined variable $DISPLAY at this time.
- this VMs running, but seen to be broken.
- do you exec "xendomains stop" now, a broken VM cannot save.
  s. Test 2

workaround:
- set DISPLAY before running "init.d/xendomains start"
- or write this line:
echo "export DISPLAY=$DISPLAY >> /etc/sysconfig/xendomains

--------------------------------------------------------
selma:~# xm info
 ...
 xen_major              : 3
 xen_minor              : 0
 xen_extra              : .5-rc2
 xen_caps               : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
 hvm-3.0-x86_32p hvm-3.0-x86_64
 xen_scheduler          : credit
 xen_pagesize           : 4096
 platform_params        : virt_start=0xffff800000000000
 xen_changeset          : Fri Apr 20 17:52:48 2007 +0100
14889:898e999f62d7
 cc_compiler            : gcc version 4.1.2 20061115 (prerelease) (Debian
 4.1.1-21)
 ...



- Test 2
  - vm7_w2k with $DISPLAY
  - vm8_w2k3  without $DISPLAY

# unset DISPLAY
# xm create vm8_w2k3
# export DISPLAY=$myhost:0
# xm create  vm7_w2k
# xm list
Name                                      ID   Mem VCPUs      State
Time(s)
Domain-0                                   0  1000     4     r-----
152.5
vm7_w2k                                    2   256     1     -b----
20.2
vm8_w2k3                                   1   256     1     ------
0.0

selma:/etc/xen# /etc/init.d/xendomains stop
Shutting down Xen domains: vm7_w2k(save)....../etc/init.d/xendomains: line
188:
 3999 Terminated              watchdog_xm save
 vm8_w2k3(save)/etc/init.d/xendomains: line 306:  3999 Terminated
w
atchdog_xm save
................................................................................
................................................................................
................................................................................
............................................................./etc/init.d/xendoma
ins: line 306:  4163 Terminated              xm save $id
$XENDOMAINS_SAVE/$name
!(shut).Domain 1 terminated
All domains terminated
/etc/init.d/xendomains: line 188: 11228 Terminated
watchdog_xm shut
down
/etc/init.d/xendomains: line 188: 11228 Terminated
watchdog_xm shut
down
 SHUTDOWN_ALL ...........................Domain migrating-vm8_w2k3
terminated
All domains terminated
/etc/init.d/xendomains: line 306: 11228 Terminated
watchdog_xm shut
down
/etc/init.d/xendomains: line 306: 11263 Terminated
watchdog_xm shut
down 1
  [done]

   - timeout 2 minutes

selma:~# ls -al  /var/lib/xen/save/
total 278192
drwxr-xr-x 2 root root      4096 May  8 07:55 .
drwxr-xr-x 5 root root      4096 May  7 07:59 ..
-rwxr-xr-x 1 root root 284572012 May  8 07:55 vm7_w2k
-rwxr-xr-x 1 root root      1303 May  8 07:55 vm8_w2k3

  - vm8_w2k3 not save
    only header was written

  - a file xen.qemu-dm.X was created
selma:/tmp# ls -al /tmp
total 16440
drwxrwxrwt  4 root root    4096 May  8 06:44 .
drwxr-xr-x 22 root root    4096 Apr 18 12:29 ..
drwxrwxrwt  2 root root    4096 May  3 07:17 .ICE-unix
drwxrwxrwt  2 root root    4096 May  3 07:17 .X11-unix
-rwxr-xr-x  1 root root 8394400 May  3 07:52 xen.qemu-dm.1

     - this file exist until removed by root

selma:/etc/xen# /etc/init.d/xendomains start
Restoring Xen domains: vm7_w2k vm8_w2k3Error: Restore failed
Usage: xm restore <CheckpointFile> [-p]

Restore a domain from a saved state.
  -p, --paused                   Do not unpause domain after restoring it

!.
  [done]



  - this errormessage is human unreadable.

  - "xendomains stop" write header-info "memory foo" to
$XENDOMAINS_SAVE/$dom
    Can "xendomains start" checking filesize integrity ?

    - sample:
fsize=`stat -c %s $XENDOMAINS_SAVE/$dom`
#mem set in readln
## check filesize with 10% toleranz
if [ $(($fsize+$fsize/10)) -lt $(($mem*1024*1024))  ]; then
  echo "check filesize integrity failed"
  continue
fi
xm restore $dom





   +----------------------------------------------------------------+
   |  Name:      Heiko Lehmann                                      |
   |  Anschrift: FHL-HRZ, Groszenhainer Str. 57, 01968 Senftenberg  |
   |  Telephon:  03573/85/358                            \\|//      |
   |  E-Mail:    hlehmann@xxxxxxxxxxxxx                  (o^o)      |
   +--------------------------------------------------oo0-(_)-0oo---+


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