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Conference decwet::advfs_support

Title:AdvFS Support/Info/Questions Notefile
Notice:note 187 is Freq Asked Questions;note 7 is support policy
Moderator:DECWET::DADDAMIO
Created:Wed Jun 02 1993
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1077
Total number of notes:4417

1018.0. "4.0b write-lock problem" by HYDRA::LAVIN () Mon Mar 17 1997 10:11



	I have a problem with advfs with DU 4.0b...tell me if this sounds 
	familiar

	I created a 20GB striped/mirrored LSM volume

	I then placed one advfs domain on top of the volume and divided the 
		domain into separate filesets (5 to be exact)

	All seems to go fine then something puts the domain and all filesets
	beneath it into write-locked mode...a showfdmn gives I/O type errors
	and says it is unavailable...trying to read files gives a "permission
	denied" error...The only thing that seems to help is a reboot...Is this
	a known problem? Is there some log file I can check to see what's 
	happening...There are no LSM errors reported and volume seems to be 
	intact...

	thanks

	leo

T.RTitleUserPersonal
Name
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1018.1NETRIX::"jchang@bwasted.zk3.dec.com"Janice ChangMon Mar 17 1997 11:028
Hello.  It sounds like the domain is panic'ing.  Do you see any messages
to your console?  Also, what kinds of operations are you doing when this
occurs?  Any particular sequence/combination of commands?

Thanks,
Janice
[Posted by WWW Notes gateway]
1018.2nothing in particularHYDRA::LAVINMon Mar 17 1997 11:4011
	It was noticed when I was moving large amounts of data to the domain.
	I have noticed no messages on the console...where else might I find
	these messages.???

	leo
	



   
1018.3NETRIX::"jchang@bwasted.zk3.dec.com"Janice ChangMon Mar 17 1997 12:4714
You may want to check the uerf logs for hardware (or other) errors.  
Beyond that, you may be having problems in the kernel, but since the problem
sounds localized I'm not sure if obtaining a crash dump would help.

However, you could always include a dump if you decide to file a QAR, as
well as the exact input leading to the problem state and the exact error
output
you receive.


Thanks,
Janice
[Posted by WWW Notes gateway]
1018.4HYDRA::LAVINMon Mar 17 1997 13:2910
	I tried doing a defrag which seems to trigger it as well...in the 
	middle of the defrag it errors saying it has no permission to read
	one of the files under the .tags directory of one of the filesets...
	It then locked up the domain once again....there are no hardware 
	errors reported on the devices in question..Fo now I assume defraging
	is the culprit and won't do it for now...

	leo

1018.5DECWET::MARTINMon Mar 17 1997 13:5316
Sounds like QAR/IPMT time.

It sounds like a possible domain corruption, for which it would be really cool
if you could send engineering a 'dd' dump of the domain.  Which, when I look at
the base note, I see that 20 gb is probably not feasible.

Have you done any changes to the LSM volume through LSM since creating the
domain?  Breaking and/or attaching plexes (mirrors) shouldn't have any effect,
but if you've increased or decreased the size of the logical volume, that could
cause AdvFS some problems.

And unfortunately LSM doesn't give any warning that you could be destroying data
when you do this.  (Or at least, I don't think it did the last time I looked at
it, which was quite a while ago.)

--Ken
1018.6HYDRA::LAVINMon Mar 17 1997 14:1511


	I created the LSM volume first and have made no changes to is since
	I have been moving filesystems onto the device in the form of filesets
	on the one domain I created on the volume...

	any help would be appreciated...for now I just won't defrag

	leo

1018.7DECWET::MARTINMon Mar 17 1997 15:231
OK.  Please file a QAR/IPMT, whichever is appropriate.