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08-01-2002 12:56 PM
08-01-2002 12:56 PM
The machine in question is a C3600, with an external tape drive and external 73gb hard disk on the SCSI 68pin chain.
Today, I removed the tape drive, and the machine wouldn't detect the presence of the HD anymore. I worked on it, and ended up recreating the kernel via steps elsewhere on this forum (mismatching symbol table) and all was well.
NOW, the problem is this:
The external drive contained a volume group with a single, really large logical volume on it. I can't, for the life of me, get that volume group back online:
Quorum not present, or some physical volume(s) are missing.
So, I do a vgchange -a y -q n vg02, and I get the same thing.
In desperation, I've tried several things. Mainly:
After exporting the vg:
1) mv /etc/lvmtab /etc/lvmtab.old;vgscan -v
2) mkdir /dev/vg02
3) mknod /dev/vg02/group c 64 0x050000
4) vgimport /dev/vg02 /dev/dsk/c3t3d0
(Warning: A backup of this VG may not exist on this machine, please remember to take a backup using vgcfgbackup)
5) vgchange -a y vg02
(Couldn't activate volume group 'vg02': Quorum not present, or some physical volume(s) are missing).
!!!
There's only 1 disk in the VG.
Another hint, possibly: vgcfgbackup vg02 gives:
vgcfgbackup: Warning: couldn't query physical volume "/dev/dsk/c3t3d0":
The specified path does not correspond to physical volume attached to
this volume group
vgcfgbackup: Couldn't query the list of physical volumes.
vgcfgbackup: Volume group not activated.
I'd *LOVE* some help on this one. It looks like it thinks the disk is a different disk or something. The disk itself seems to have the LVOL on it, but I can't bring the volume group online.
Thanks a bunch - you guys are my heroes. ;)
Solved! Go to Solution.
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08-01-2002 12:59 PM
08-01-2002 12:59 PM
Re: Quorum not Present, or Physical volume missing
ioscan -funC disk
disk 3 10/0/15/1.3.0 sdisk CLAIMED DEVICE SEAGATE ST373405LW
/dev/dsk/c3t3d0 /dev/rdsk/c3t3d0
...so it can speak to the device properly, far as I can tell.
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08-01-2002 12:59 PM
08-01-2002 12:59 PM
Re: Quorum not Present, or Physical volume missing
# ioscan -fnC disk
What about a pvdisplay?
# pvdisplay -v /dev/dsk/c?t?d0
Is the SCSI chain terminiated correctly? Is the drive powered up? Has anything else changed other than removing the tape drive?
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08-01-2002 01:00 PM
08-01-2002 01:00 PM
Re: Quorum not Present, or Physical volume missing
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08-01-2002 01:03 PM
08-01-2002 01:03 PM
Re: Quorum not Present, or Physical volume missing
pvdisplay: Warning: couldn't query physical volume "/dev/dsk/c3t3d0":
The specified path does not correspond to physical volume attached to
this volume group
pvdisplay: Couldn't query the list of physical volumes.
pvdisplay: Couldn't retrieve the names of the physical volumes
belonging to volume group "/dev/vg02".
pvdisplay: Cannot display physical volume "/dev/dsk/c3t3d0".
..Yes, I forgot to mention: I *DID* change the SCSI ID of the drive while trying to get it to detect, but it is now (I believe) changed back to where it originally was.
Thanks for the replies - appreciate the help!
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08-01-2002 01:06 PM
08-01-2002 01:06 PM
Re: Quorum not Present, or Physical volume missing
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08-01-2002 01:08 PM
08-01-2002 01:08 PM
Re: Quorum not Present, or Physical volume missing
Again, it's talking to the drive - I'm able to see it as a "ready to import" drive in SAM - but when I try and import it, it gives me the error that vgchange failed because of the quorum/missing disk thing.
I guess what I can't figure out is where it decides to "remember" that it's looking for a particular disk?!
Dave
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08-01-2002 01:14 PM
08-01-2002 01:14 PM
Re: Quorum not Present, or Physical volume missing
Manoj Srivastava
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08-01-2002 01:16 PM
08-01-2002 01:16 PM
Re: Quorum not Present, or Physical volume missing
SCSI describe of /dev/rdsk/c3t3d0:
vendor: SEAGATE
product id: ST373405LW
type: direct access
size: 71687370 Kbytes
bytes per sector: 512
...that looks right to me...?
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08-01-2002 01:21 PM
08-01-2002 01:21 PM
Re: Quorum not Present, or Physical volume missing
dd if=/dev/rdsk/c3t3d0 bs=64k of=/dev/null
If that reads without errors then the drive should be physically ok. That does not mean that the LVM data structures haven't been clobbered.
Since you have done a vgexport, do a strings /etc/lvmtab and see if it looks ok. None of your vg02 data should be displayed. The other thing to make certain is that the minor device of your group file (0x050000) is unique and not in use by some other VG. By the way, 0x020000 would be more standard for vg02 but that is up to you.
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08-01-2002 01:33 PM
08-01-2002 01:33 PM
Re: Quorum not Present, or Physical volume missing
So, I cancelled it and went into my syslog. Whoa:
Aug 1 17:38:09 dino vmunix: SCSI: Resetting SCSI -- lbolt: 370301, bus: 3
Aug 1 17:38:09 dino vmunix: SCSI: Reset detected -- lbolt: 370301, bus: 3
Aug 1 17:38:09 dino vmunix: lv_readvgdats: Could not read VGDA 1 header & trailer f
rom disk H/W path 10/0/15/1.6.0 (error = 5)
...and others. Now, it's talking about H/W path 1.6.0, which is the internal (OS) disk - but above, it says lbolt: 370301, bus: 3...
Are you still thinking termination, here?
I'm going to unplug everything and plug it back in and check. Visually, it looks fine (and the light on the terminator IS on)... but let's have a look. :)
Thanks for the advice so far!
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08-01-2002 02:05 PM
08-01-2002 02:05 PM
Re: Quorum not Present, or Physical volume missing
I actually decided to move the drive to another machine (identical config, except external devices), and am getting the EXACT same error using the SAM import.
I purposely put the drive in the middle of the chain to ensure that there are no SCSI bus issues. I also had to re-address the drive to 4, as 3 was already in use on the chain. (now c3t4d0).
dd command runs successfully, as far as I can tell.. or, I should say, is runNING successfully as far as I can tell (it's still rollin' along). It's got around 60 gigs of data to crunch through - how long should that take?
I'd love some other suggestions. It's entirely possible that I messed something up on my own (in terms of something on the disk) when I was trying to bring it back online - is there a way to check and see what a VG (that's sitting on a disk) expects in terms of PVs?
Dave
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08-01-2002 02:34 PM
08-01-2002 02:34 PM
Re: Quorum not Present, or Physical volume missing
dd finished successfully - 1120115+1 records in, 1120115+1 records out.
Anyone have any thoughts?
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08-02-2002 03:39 AM
08-02-2002 03:39 AM
Re: Quorum not Present, or Physical volume missing
Anyhow, since DD runs.. is there a way to get the data from the drive? (I'm thinking of a copy of the LV structure, or just the data contained within the LV, or something, here) I have a tar backup of the drive, but a) it's LARGE, and b) the user did it. I'd only like to lean on that if I *HAVE* to. Since the drive looks okay, and it looks like something in the VG header has gotten hosed instead (are there no tools to look at what the VG *thinks* it should be having in terms of PVs?), I'm going on the assumption that the drive will be usable if I simply make a new VG (but that will obviously render the data on the drive unusable).
Thanks again, guys. -Dave
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08-02-2002 06:08 AM
08-02-2002 06:08 AM
Re: Quorum not Present, or Physical volume missing
My best guess is that you have somehow (maybe by having duplicate SCSI ID's on the same bus briefly) overwritten a portion of either the PVRA (Physical Volume Reserved Area) or the VGRA (Volume Group Reserved Area) of this disk. If either of these has been clobbered, you are almost certainly not going to be able to recover.
It's probably time to pull out the backup but certainly read the backup's table of contents without restoring before you do a new pvcreate/vgcreate.
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08-02-2002 06:13 AM
08-02-2002 06:13 AM
Re: Quorum not Present, or Physical volume missing
I guess what I'm asking is if there's no way you can think of to attempt to get this back online, or should I just go ahead? I'll entertain *anything* at this point.
What I've been sort of surprised by is that on HP-UX (apparently), there's no way of listing the contents of that area in a readable (or otherwise?) manner.
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08-02-2002 06:37 AM
08-02-2002 06:37 AM
Re: Quorum not Present, or Physical volume missing
what I would do is shutdown the system, check all SCSI IDs physically, make sure nothing conflicts, check all termination, boot the system, interrupt it at starting, give "search" command at Boot menu, make sure all devices are detected properly and boot the system in single user mode (hpux -is)
Once booted, mv /etc/lvmtab to lvmtab.old and do a:
# vgscan -a
Check the output and find out which HDDs are on same VG. Check output of the:
#strings /etc/lvmtab
If the VG is still missing, try doing a vgimport manually:
Create a new VG name, mknod group, vgimport and vgchange
If you do very carefully and if you still have the data on the disk, you will defenitely able to configure it !
rgds
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08-02-2002 06:50 AM
08-02-2002 06:50 AM
Re: Quorum not Present, or Physical volume missing
Try this to see what the backup files look like:
ls -l /etc/lvmconf/vg02*
This will list any possible backup files assuming you did not specify a backup file when you ran vgcfgbackup or any of the standard LVM commands that automatically backup the LVM data structures.
vgcfgrestore -f /etc/lvmconf/vg02.conf -l
Try that with any backup files that you find.
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08-02-2002 07:02 AM
08-02-2002 07:02 AM
Re: Quorum not Present, or Physical volume missing
When I was trying to import the drive after problems began happening, I was using other volume group names - just in case there was a backup out there somewhere under the original name. ;)
I need to move the drive back over to the original machine (again, I moved it to remove any potential SCSI bus errors on there) and try that command. So, I'll be putting the drive back on there, and issuing the
vgcfgrestore -f /etc/lvmconf/teamext.conf -l
...command unless I hear otherwise in the next 30 mins.. I'll be doing it while the user takes lunch (the joys of sysadmin duty), and will report back here!
Thanks so much for the suggestions, regardless as to how it works out. What a great forum! -ave
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08-02-2002 07:22 AM
08-02-2002 07:22 AM
Re: Quorum not Present, or Physical volume missing
But, here are my thoughts:
. If you're running HP-UX 10.20 be sure having PHKL_25439 installed and not one of its predecessors.
or
. Try to go back to the original state when all was running fine. I.e. put back your tape drive and use the old kernel to boot from. Use vmunix.prev or another kernel from a backup (if you have one).
or
. As you told you tried to import the vg on another machine without success, the same error message. Install PHKL_25439 on that machine and try it again.
or
. Use the tar backup (maybe, you should be lucky that at least the user made a backup instead of you, thanks to the user!!)
Unfortunately, no software is really secure. So, if your problem rised due to the missing PHKL_25439, any HP program reading VGRA would give you wrong or out of date information. If not, try to contact HP support. Maybe, they have a solution for you. If not and if your data on the disk is really of lot of worth, try to contact companies specialised in restoring data from nearly destroyed disks. But this would cost some money.
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08-02-2002 07:28 AM
08-02-2002 07:28 AM
Re: Quorum not Present, or Physical volume missing
the '-l' option with vgcfgrestore will only list the content of the config file. If you want to do the actual task, then apply it without -l and with VGname and PV-path:
# vgcfgrestore -f filename pv_path
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08-02-2002 08:03 AM
08-02-2002 08:03 AM
Re: Quorum not Present, or Physical volume missing
I tried the vgcfgrestore command, and it did restore the configuration (so it says), but the thing still won't import.
Same message - Quorum not present, or physical volumes missing.
Whatever the case, my thinking is that the volume group config (backed up July 17, when the VG was created) should be current on the drive. The vgcfgrestore -l gives:
--
Volume Group Configuration information in "/etc/lvmconf/teamext.conf"
VG Name /dev/teamext
---- Physical volumes : 1 ----
/dev/rdsk/c3t3d0 (Non-bootable)
--
...and that's what restored to the disk. The deviceid IS c3t3d0 right now, it lists only 1 physical volume in the backup file... therefore, I can't see why it's looking for an "additional" physical volume. How is that possible?!
I'm running HP-UX 11 (sorry I forgot to mention that).
I believe I tried the unix kernel trick as well - though I can't say for sure. I'll give that a try later on.
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08-02-2002 08:09 AM
08-02-2002 08:09 AM
Re: Quorum not Present, or Physical volume missing
can you try this:
# vgexport /dev/teamext
# mkdir /dev/vg05 (if vg05 is not already there)
# mknod group c 64 0x050000
# vgimport /dev/vg05 /dev/dsk/c3t3d0
# vgdisplay -v /dev/vg05
# vgchange -a y /dev/vg05
gl,
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08-02-2002 08:43 AM
08-02-2002 08:43 AM
Re: Quorum not Present, or Physical volume missing
Then, the vgchange -a y godvg fails as before.
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08-02-2002 08:53 AM
08-02-2002 08:53 AM
Solutionfirst, your style in using this forum is very good. I hope you will have success, here.
Have a look on patch description of PHKL_27178 (HP-UX 11.00), search for "quorum". There appears the same error message you are getting (description of PHKL_25775). Check the text, compare with your situation, and install PHKL_27178, if necessary.