xbd IO domain 2: error 5 (Xen2, NetBSD 3.0)

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Hi all,

I've been running a box as a xen server in strict production
with no  
software changes in the past 6 months (last change was an
xen-related  
ARP-fix that went in sometime in March). Everything is
running fine.

A week ago I had to replace the system disk (needed a larger
disk, no  
physical problems with the old one). I populated the new
disk via  
dump/restore, installed boot blocks, GRUB cruft and all
that. Machine  
runs just fine with new disk and everything is back to
normal. Except  
for one thing: I now see a sprinkling of

	"xbd IO domain 2: error 5"

in the logs and on the console. Never saw that before. It is
always  
"domain 2" (which is started at boot) and always
"error 5" (which I  
assume is "IO error" a la errno.h). I haven't
noticed any real  
problems, though, everything *seems* to still work fine.

But I sure would like to know what the problem is
(especially if this  
signals a REAL problem somewhere) and why it arrived in
combination  
with the disk replacement. Any ideas?

Regards,

Johan

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On Thu, Oct 05, 2006 at 09:33:42PM +0200, Johan Ihren wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi all,
> 
> I've been running a box as a xen server in strict
production with no  
> software changes in the past 6 months (last change was
an xen-related  
> ARP-fix that went in sometime in March). Everything is
running fine.
> 
> A week ago I had to replace the system disk (needed a
larger disk, no  
> physical problems with the old one). I populated the
new disk via  
> dump/restore, installed boot blocks, GRUB cruft and all
that. Machine  
> runs just fine with new disk and everything is back to
normal. Except  
> for one thing: I now see a sprinkling of
> 
> 	"xbd IO domain 2: error 5"
> 
> in the logs and on the console. Never saw that before.
It is always  
> "domain 2" (which is started at boot) and
always "error 5" (which I  
> assume is "IO error" a la errno.h). I haven't
noticed any real  
> problems, though, everything *seems* to still work
fine.
> 
> But I sure would like to know what the problem is
(especially if this  
> signals a REAL problem somewhere) and why it arrived in
combination  
> with the disk replacement. Any ideas?

Is it a physical partition or a vnd ?
If it's a physical partition make sure you didn't make it
too short.
If it's a vnd, make sure you can read the whole file, and
that it didn't
get truncated.

-- 
Manuel Bouyer <bouyerantioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la
difference
--

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Hash: SHA1

Hi Manuel,

>> for one thing: I now see a sprinkling of
>>
>> 	"xbd IO domain 2: error 5"
>>
>> in the logs and on the console. Never saw that
before. It is always
>> "domain 2" (which is started at boot) and
always "error 5" (which I
>> assume is "IO error" a la errno.h). I
haven't noticed any real
>> problems, though, everything *seems* to still work
fine.
>>
>> But I sure would like to know what the problem is
(especially if this
>> signals a REAL problem somewhere) and why it
arrived in combination
>> with the disk replacement. Any ideas?
>
> Is it a physical partition or a vnd ?

vnd

> If it's a physical partition make sure you didn't make
it too short.
> If it's a vnd, make sure you can read the whole file,
and that it  
> didn't
> get truncated.

There were no errors during dump/restore from old disk to
new disk.  
The file has the correct size and I'm able to read it all
from the  
Dom0 without any errors.

Johan


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On Thu, Oct 05, 2006 at 11:09:42PM +0200, Johan Ihren wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi Manuel,
> 
> >>for one thing: I now see a sprinkling of
> >>
> >>	"xbd IO domain 2: error 5"
> >>
> >>in the logs and on the console. Never saw that
before. It is always
> >>"domain 2" (which is started at boot)
and always "error 5" (which I
> >>assume is "IO error" a la errno.h). I
haven't noticed any real
> >>problems, though, everything *seems* to still
work fine.
> >>
> >>But I sure would like to know what the problem
is (especially if this
> >>signals a REAL problem somewhere) and why it
arrived in combination
> >>with the disk replacement. Any ideas?
> >
> >Is it a physical partition or a vnd ?
> 
> vnd
> 
> >If it's a physical partition make sure you didn't
make it too short.
> >If it's a vnd, make sure you can read the whole
file, and that it  
> >didn't
> >get truncated.
> 
> There were no errors during dump/restore from old disk
to new disk.  
> The file has the correct size and I'm able to read it
all from the  
> Dom0 without any errors.

Hum, can you dd from /dev/rvnd0d to /dev/null the whole
device ?
If the error comes from xbdback itself, there should be
another error
message before this one.

-- 
Manuel Bouyer <bouyerantioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la
difference
--

On Thu, Oct 05, 2006 at 09:33:42PM +0200, Johan Ihren wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Hi all,
> 
> I've been running a box as a xen server in strict
production with no  
> software changes in the past 6 months (last change was
an xen-related  
> ARP-fix that went in sometime in March). Everything is
running fine.
> 
> A week ago I had to replace the system disk (needed a
larger disk, no  
> physical problems with the old one). I populated the
new disk via  
> dump/restore, installed boot blocks, GRUB cruft and all
that. Machine  
> runs just fine with new disk and everything is back to
normal. Except  
> for one thing: I now see a sprinkling of
> 
> 	"xbd IO domain 2: error 5"
> 
> in the logs and on the console. Never saw that before.
It is always  
> "domain 2" (which is started at boot) and
always "error 5" (which I  
> assume is "IO error" a la errno.h). I haven't
noticed any real  
> problems, though, everything *seems* to still work
fine.
> 
> But I sure would like to know what the problem is
(especially if this  
> signals a REAL problem somewhere) and why it arrived in
combination  
> with the disk replacement. Any ideas?

Is it a physical partition or a vnd ?
If it's a physical partition make sure you didn't make it
too short.
If it's a vnd, make sure you can read the whole file, and
that it didn't
get truncated.

-- 
Manuel Bouyer <bouyerantioche.eu.org>
     NetBSD: 26 ans d'experience feront toujours la
difference
--

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi Manuel,

>> for one thing: I now see a sprinkling of
>>
>> 	"xbd IO domain 2: error 5"
>>
>> in the logs and on the console. Never saw that
before. It is always
>> "domain 2" (which is started at boot) and
always "error 5" (which I
>> assume is "IO error" a la errno.h). I
haven't noticed any real
>> problems, though, everything *seems* to still work
fine.
>>
>> But I sure would like to know what the problem is
(especially if this
>> signals a REAL problem somewhere) and why it
arrived in combination
>> with the disk replacement. Any ideas?
>
> Is it a physical partition or a vnd ?

vnd

> If it's a physical partition make sure you didn't make
it too short.
> If it's a vnd, make sure you can read the whole file,
and that it  
> didn't
> get truncated.

There were no errors during dump/restore from old disk to
new disk.  
The file has the correct size and I'm able to read it all
from the  
Dom0 without any errors.

Johan


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