topic Re: Missing Filesystem after reboot in Operating System - HP-UX

Missing Filesystem after reboot

Rick Chen_1 — Wed, 07 Oct 2009 14:43:43 GMT

The new filesystem /dev/vgpacet6/lvol1 was added to /etc/fstab. It is not mounted after reboot. No information found in rc.log, syslog.log to identify what exactly happened during reboot.
- try to mount the filesystem:
/dev/vgpacet6/lvol1: No such device or address
- vgdisplay vgpacet6
vgdisplay: Volume group not activated.
vgdisplay: Cannot display volume group "vgpacet6".
-vgchange -a y vgpacet6
Activated volume group
Volume group "vgpacet6" has been successfully changed.

Then I can mount this device.

What went wrong with it during reboot? How can I avoid this during next reboot?

Thanks

Re: Missing Filesystem after reboot

Pete Randall — Wed, 07 Oct 2009 14:46:15 GMT

It needs to be in /etc/mnttab, not fstab. Then you need to figure out why it was not activated. Is this a Service Guard situation?

Pete

Re: Missing Filesystem after reboot

Pete Randall — Wed, 07 Oct 2009 14:49:26 GMT

Check the discussion about /etc/lvmrc in this thread:

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=765250

Pete

Re: Missing Filesystem after reboot

Raj D. — Wed, 07 Oct 2009 17:53:08 GMT

Rick Chen,

>What went wrong with it during reboot? How can I avoid this during next reboot?

- Looks like some one newly created this vg and added filesystem to the system , however didn't do it correctly. And so it didnot come properly in next reboot.

- To avoid this : (Make sure before reboot):
1. Make sure the new vg has been added to /etc/lvmrc if AUTO_VGACTIVATE is mentioned 0 in /etc/lvmrc .

[ AUTO_VG_ACTIVATE=1 in /etc/lvmrc means automatic VG activation of all vg during reboot ]

2. Make sure the filesystem is added in /etc/fstab

3. Also it would be a good idea to take an output of bdf & vgdisplay -v & /etc/lvmtab before reboot, so after reboot it would be easy to deal with.
# bdf > bdf.txt
# vgdisplay -v > vgdisplay_v.txt 2>&1
# strings /etc/lvmtab > lvmtab.txt ; cp -p /etc/lvmtab ~lvmtab.copy.date

Hth,
Raj.

Re: Missing Filesystem after reboot

Pete Randall — Wed, 07 Oct 2009 18:05:10 GMT

My apologies. I said /etc/mnttab was the appropriate file. It's not. The correct file would be /etc/fstab.

For some reason I seem to get that backwards half the time.

Pete

Re: Missing Filesystem after reboot

Rick Chen_1 — Wed, 07 Oct 2009 18:20:25 GMT

This is newly added filesystem. The previously filesystems are fine. I checked /etc/mnttab, the newly added filesystem was added after a line - such as servername:(pid1494) /net ignore ro,intr,port=821,map=-hosts,indirect,dev=0000 0 0 1254841786

Should I move it up above this line?

/etc/lvmrc hasn't been changed. it currently has AUTO_VG_ACTIVATE=0. Why did not this happen to other filesystems?

Re: Missing Filesystem after reboot

TTr — Wed, 07 Oct 2009 18:47:45 GMT

Do not touch /etc/mnttab.

If AUTO_VG_ACTIVATE was set to 0, then look further down in the /etc/lvmrc file, in the custom_vg_activation section (function) to see if the volume groups are listed there.

Is this server (or was it before) part of a servicegurd cluster? That's when usually the AUTO_VG_AVTIVATE is set to 0.

I have also seen other cases where after a power failure, the server would boot up faster than the external storgae system and if the volume group was on the external storage system it would not be available for activation right away. So these volume groups were activated at a later time via a custom start up script.

Re: Missing Filesystem after reboot

Raj D. — Wed, 07 Oct 2009 18:54:46 GMT

Rick Chen,

> The new filesystem /dev/vgpacet6/lvol1 was added to /etc/fstab. It is not mounted after reboot.

However in your case the problem is , the vg (vgpacet6) was not activated during boot time. And so the filesystem was not mounted, no matter you have added the filesystem entry in /etc/fstab . ( fyi: it is not mnttab )

Q.
1. Is it a new vg recently created.? ( /dev/vgpacet6 ).
2. If yes, has it been added to /etc/lvmrc . (Since AUTO_VG_ACTIVATE=0)

If the answer is 'no' to question 1 , then you have to check if the vg vgpacet6 is there in the /etc/lvmrc or not.

If vgpacet6 is not present in /etc/lvmrc it is obvious it will not be activated during boot time, and so the filesystem will not be mounted.

NOTE:
-ServiceGuard VG's get activated during the package start process.
- Other normal vgs gets activated from lvmrc
/etc/lvmrc populate the function custom_vg_activation() , and activate the vgs.

( Assuming VG_AUTO_ACTIVATE configured to 0 )

Cheers,
Raj.

Re: Missing Filesystem after reboot

Rick Chen_1 — Wed, 07 Oct 2009 20:09:32 GMT

Based on the information you provided I looked into /etc/fstab again and found out an incorrect character was added to "delaylog" which I believe caused this filesystem not mounted during reboot. Thanks everyone for the information.

Re: Missing Filesystem after reboot

Raj D. — Wed, 07 Oct 2009 20:26:40 GMT

Rick,
Nice to know /etc/fstab wrong entry was the culprit and fixed it.

Please take some time from your busy schedule to assign some "points" to the responses , as a token of appreciation.

Thanks.
Raj.

Re: Missing Filesystem after reboot

Patrick Wallek — Wed, 07 Oct 2009 23:45:40 GMT

>>I believe caused this filesystem not mounted during reboot. Thanks everyone for the information.

That would have caused the filesystem to not be mounted. However, if that was the only problem then the VG should have activated automatically.

I believe it would be wise to double check your /etc/lvmrc file and look in the "manual VG activation" section to see if other VGs are listed. If so, then vgpacet6 should be added as well.

Re: Missing Filesystem after reboot

Raj D. — Thu, 08 Oct 2009 01:41:28 GMT

Rick Chen,
> vgdisplay: Volume group not activated.
vgdisplay: Cannot display volume group "vgpacet6".

-Why do you need to activate the vg manually , with vgchange -a y , after reboot.

-It doesnt look like the problem was only due to bad entry in /etc/fstab,

- I agree above, it would be wise to double check /etc/lvmrc if you have this vg listed under customer_vg_activation function. Else the same thing may repeat in next reboot.

Hth,