lvmtab problems

[Scott Dunkley]

Hi all,

I am trying to do some admin on VG00 but keep getting the message that it doesnt exist in the lvmtab. I tried remiving the lvmtab and running vgscan but the entry that gets put back in the lvmtab looks like this:

/dev/
/dev/dsk/c0t5d0
/dev/dsk/c0t15d0

I would have expected it to have stated /dev/vg00. This is stopping me do lvm commands against this VG? Why would this happen and how do I rectify it?

[Elmar P. Kolkman]

Please check in /dev for a special file called group. Perhaps this has been moved from /dev/vg00 to /dev ?

[Scott Dunkley]

firstly why would this have been moved? It hasnt anyway and if it wasnt there then the file systems would work correctly anyway would they?

crw-r----- 1 root sys 64 0x000000 Apr 6 17:34 group

[Michael Tully]

The output in your first posting was it?

# strings /etc/lvmtab

or something else?
What does vgdisplay -v /dev/vg00 say?
What LVM commands are you trying to do?
Does /dev/root appear in the bdf output?

[Scott Dunkley]

yes the output was from a strings of the lvmtab. bdf shows:

Filesystem kbytes used avail %used Mounted on
/dev/vg00/lvol3 86016 55890 28294 66% /
/dev/vg00/lvol1 47829 30798 12248 72% /stand
/dev/vg00/lvol8 614400 496812 111317 82% /var
/dev/vg00/lvol7 819200 541901 260014 68% /usr
/dev/vg00/lvol4 32768 6513 24672 21% /tmp
/dev/vg00/lvol6 438272 289637 139378 68% /opt
/dev/vg00/lvol5 20480 1109 18168 6% /home

If I try any lvm commands against VG00 I get the message that VG00 is not in the lvmtab.

Have tried, lvreduce, lvdisplay, vgdisplay and all return the same message.

[Shaikh Imran]

Hi,
Have you tried this :
rename the lvmtab file and run
#vgscan -v
and then you got this error ?

Regards

[Scott Dunkley]

yes I removed the lvmtab and ran vgscan and it still appears as /dev not /dev/vg00.

Admitidley I didnt use -v but thats only going to show me more output.

[Robert-Jan Goossens]

Hi Scott,

Could you check minor and major numbers of vg00 with this command.

# cd /dev
# find . -exec ll {} \; | grep 0x000000 | grep 64
crw-r----- 1 root sys 64 0x000000 May 18 2000 group
crw-r----- 1 root sys 64 0x000000 May 18 2000 ./vg00/group

Regards,
Robert-Jan

[Scott Dunkley]

Hi robert,

i was thinking along the same lines and looking for a rogue group file in /dev. Couldnt find one. Anyway I have run the find command and recieved the following output:

crw-rw---- 1 root root 64 0x000000 Apr 13 1999 slvmvg
crw-rw---- 1 root root 64 0x000000 Apr 13 1999 ./slvmvg
crw-r----- 1 root sys 64 0x000000 Apr 6 17:34 group
crw-r----- 1 root sys 64 0x000000 Apr 6 17:34 ./vg00/group

This doesnt look right to me but i dont know why?

[Scott Dunkley]

what is slvmg?

[Robert-Jan Goossens · Accepted solution]

Bingo :-)

http://www5.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000072837857

Document description: vg00 is missing in /etc/lvmtab
Document id: KBRC00012975

Check if you can open the above doc.

Robert-Jan

(if not drop a message)

[piotr wienckiewicz]

hi
maybe you did vgexport ??

[Scott Dunkley]

Hi robert,

thanks for that, just the ticket. Makes sense as well after reading the note you posted.

i am giving it a go now. If I dont report back you can take it that it worked ok.

Cheers,

Scott.

[Pete Randall]

Scott,

The problem is that you've got duplicate minor numbers on vg00 and slvmvg. They both have 0x000000 and the first two characters after the x are the minor number. You need to track down this slvmvg and change it's minor number, probably by exporting it with vgexport, creating a new group file with a correct minor number, and then re-importing it.


Pete

[Pete Randall]

The slvmvg is from ServiceGuard:

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=63637

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=36375

According to Robert-Jan's doc, it would seem that you can safely get rid of it and it will be re-created properly later on.


Pete