Xen devel - Dec 2004 - Problem: "short write" while starting domain

Hi

Sometimes when I try to start a domain (with a config file similar to the one in
/etc/xen/xmexample1), I get the following error:

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

Checking root filesystem
[/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/hda4
/1: clean, 124212/2441216 files, 676342/4873719 blocks
Error writing block 522 (Attempt to write block from filesystem resulted in
short write).  Error writing block 522 (Attempt to write block from filesystem
resulted in short write).
 
/1: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
        (i.e., without -a or -p options)
 
 
/1: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
        (i.e., without -a or -p options)
[FAILED]
 
*** An error occurred during the file system check.
*** Dropping you to a shell; the system will reboot
*** when you leave the shell.
Give root password for maintenance
(or type Control-D to continue):

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

I have''nt done any changes apart from from the simple installation
instructions
given on the website. Can anyone give a pointer as to where I should look, and
what I should be looking to correct?

Thanks.
Mukund



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> Sometimes when I try to start a domain (with a config file similar to the
one in
> /etc/xen/xmexample1), I get the following error:
> 
> ------------------------------------------------
> 
> Checking root filesystem
> [/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/hda4
> /1: clean, 124212/2441216 files, 676342/4873719 blocks
> Error writing block 522 (Attempt to write block from filesystem resulted in
> short write).  Error writing block 522 (Attempt to write block from
filesystem
> resulted in short write).
> ---------------------------------------------------
> 
> I have''nt done any changes apart from from the simple installation
instructions
> given on the website. Can anyone give a pointer as to where I should look,
and
> what I should be looking to correct?
Odd. What are you using to back hda4? A physical partition,
LVM volume, or a loop back file?  Does dom0 ''dmesg'' report any
errors? 

If you login, does the file system look OK? Does fsck fail if you
run it manually? Can you remount the file system rw? Do writes
otherwise seem to work?

Ian


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> > Sometimes when I try to start a domain (with a config file similar to
the
one in
> > /etc/xen/xmexample1), I get the following error:
> > 
> > ------------------------------------------------
> > 
> > Checking root filesystem
> > [/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/hda4
> > /1: clean, 124212/2441216 files, 676342/4873719 blocks
> > Error writing block 522 (Attempt to write block from filesystem
resulted in
> > short write).  Error writing block 522 (Attempt to write block from 
filesystem
> > resulted in short write).
> > ---------------------------------------------------
> > 
> > I have''nt done any changes apart from from the simple
installation
instructions
> > given on the website. Can anyone give a pointer as to where I should
look,
and
> > what I should be looking to correct?
> 
> Odd. What are you using to back hda4? A physical partition,
> LVM volume, or a loop back file?  Does dom0 ''dmesg''
report any
> errors? 
> 
> If you login, does the file system look OK? Does fsck fail if you
> run it manually? Can you remount the file system rw? Do writes
> otherwise seem to work?
> 
> Ian
hda4 is a physical partition on the disk on which I''ve installed FC2.
Once I
login and run fsck manually, it reports the same thing ... that is, there is a 
error writing block 522 (Attempt to write block from filesystem resulted in 
short write) Ignore[y]?

However, dom0 does not report any error ...

Thanks.
Mukund



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Hi,

On Tue, Dec 14, 2004 at 11:24:38AM +0000, Ian Pratt
wrote:
> > Sometimes when I try to start a domain (with a config file similar to
the one in
> > /etc/xen/xmexample1), I get the following error:
> > 
> > ------------------------------------------------
> > 
> > Checking root filesystem
> > [/sbin/fsck.ext3 (1) -- /] fsck.ext3 -a /dev/hda4
> > /1: clean, 124212/2441216 files, 676342/4873719 blocks
> > Error writing block 522 (Attempt to write block from filesystem
resulted in
> > short write).  Error writing block 522 (Attempt to write block from
filesystem
> > resulted in short write).
> > ---------------------------------------------------
> > 
> > I have''nt done any changes apart from from the simple
installation instructions
> > given on the website. Can anyone give a pointer as to where I should
look, and
> > what I should be looking to correct?
Try importing the block device as sda4 in the domain. I had problems like 
this with importing block devices as IDE disks. I''m pretty curious if
it
solves your problem.


	Gabor


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i tried to live migrate a domain from a source machine to a destination
but i met the following problem:
   Error: Error: [Failure instance: Traceback: <type
''int''>, 1

i can see the migrated domain when i ran the command "xm list" on the
destination, however, when i tried to log in its console, it hanged there.

i attach the information from /var/log/xend-debug.log on the source
machine for your reference.

thank you in advance for your help.

-xuehai

sync_session> <type ''str''> 1
[''migrate'', [''id'', ''1''],
[''state'', ''begin''],
[''live'', 1], [''resource'', 0],
[''src'', [''host'',
''hamachi''], [''domain'',
''2'']], [''dst'', [''host'',
''128.135.11.104'']]]
Started to connect self= <xen.xend.XendMigrate.XfrdClientFactory instance
at 0xb78aa20c> connector= <twisted.internet.tcp.Connector instance at
0xb78aa22c>
op_migrate>
/usr/lib/python2.3/site-packages/twisted/internet/defer.py:398:
FutureWarning: hex()/oct() of negative int will return a signed string in
Python 2.4 and up
  return "<%s at %s>" % (cname, hex(id(self)))
<Deferred at 0xb78aa04c>
buildProtocol> IPv4Address(TCP, ''localhost'', 8002)
xfr_err> [''xfr.err'', ''0'']
xfr_err> <type ''str''> 0
xfr_vm_suspend> [''xfr.vm.suspend'', ''2'']
VirqClient.virqReceived> 4
xfr_vm_suspend>onSuspended> xend.domain.suspended
[''haivm1'', ''2'']
xfr_vm_destroy> [''xfr.vm.destroy'', ''2'']
vif-bridge down vif=vif2.0 domain=haivm1 mac=aa:00:00:60:74:6a
bridge=xen-br0
xfr_err> [''xfr.err'', ''1'']
xfr_err> <type ''str''> 1
Error> 1
Error> calling errback
***cbremove> [Failure instance: Traceback: <type
''int''>, 1
]
***_delete_session> 1
_op_migrate_err> [Failure instance: Traceback: <type
''int''>, 1
] <POST /xend/domain/haivm1 HTTP/1.1>
Xfrd>loseConnection>
Xfrd>connectionLost> [Failure instance: Traceback:
twisted.internet.error.ConnectionDone, Connection was closed cleanly.
]
XfrdMigrateInfo>connectionLost> [Failure instance: Traceback:
twisted.internet.error.ConnectionDone, Connection was closed cleanly.
]
XfrdInfo>connectionLost> [Failure instance: Traceback:
twisted.internet.error.ConnectionDone, Connection was closed cleanly.
]
Error> migrate failed
clientConnectionLost> connector= <twisted.internet.tcp.Connector instance
at 0xb78aa22c> reason= [Failure instance: Traceback:
twisted.internet.error.ConnectionDone, Connection was closed cleanly.
]



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