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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 07:11



	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.R	Title	User	Personal Name	Date	Lines
1018.1		NETRIX::"[email protected]"	Janice Chang	`Mon Mar 17 1997 08:02`	8
	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]
1018.2	nothing in particular	HYDRA::LAVIN		`Mon Mar 17 1997 08:40`	11
	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
1018.3		NETRIX::"[email protected]"	Janice Chang	`Mon Mar 17 1997 09:47`	14
	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]
1018.4		HYDRA::LAVIN		`Mon Mar 17 1997 10:29`	10
	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
1018.5		DECWET::MARTIN		`Mon Mar 17 1997 10:53`	16
	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
1018.6		HYDRA::LAVIN		`Mon Mar 17 1997 11:15`	11
	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
1018.7		DECWET::MARTIN		`Mon Mar 17 1997 12:23`	1
	OK. Please file a QAR/IPMT, whichever is appropriate.