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тАО03-08-2002 12:39 AM
тАО03-08-2002 12:39 AM
The amazing dissapearing Logical volume
I am currently trying to uncover the mystery of three logical volumes that are missing from my system. Sam acknowledges that they are there, but cannot see the mount points. My fstab does not indicate their existence, and there are no missing peripherals from the setup. It all seems a bit weird?
The volume group consists of four 2gig disks, 2 of which have Oracle installed, spread over two logical volumes.
I was curious as to whether there is some sort of history log that I can look in to check of their existence.
thanks for any suggestions whatsoever!
John
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тАО03-08-2002 12:43 AM
тАО03-08-2002 12:43 AM
Re: The amazing dissapearing Logical volume
is it possible this are raw volumes used for Oracle data??
Oracle can use raw devices instead of cooked filesystems (with ordinary directories and files) for high performance. In this case you will not find any references in /etc/fstab. Check with your DBA.
regards,
Thierry.
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тАО03-08-2002 12:47 AM
тАО03-08-2002 12:47 AM
Re: The amazing dissapearing Logical volume
You wont't seee theese volumes with tools that look for file systems.
Try vgdisplay -v
Regards
rainer
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тАО03-08-2002 01:04 AM
тАО03-08-2002 01:04 AM
Re: The amazing dissapearing Logical volume
switch to oracle user and do
svrmgrl
connect internal
select * from dba_data_files;
select * from v$datafile;
select * from v$controlfile;
select * from v$logfile;
Check out if the names listed refer to your raw logical volumes or to links that point to these volumes. If yes, Oracle is using these volumes directly, if not, they might have been created and even mounted, but not enterd into the fstab-file.
Volker
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тАО03-08-2002 01:04 AM
тАО03-08-2002 01:04 AM
Re: The amazing dissapearing Logical volume
thanks for your suggestions.
There are no raw file systems used by Oracle and I can see the allocated Logical volume groups i.e. :
in sam 'Disks and File Systems'
Name MB available PV's LV's
--------------------------------------
vg00 164 of 2044 1 8
vg01 0 of 8128 4 5
and
#pvdisplay -v vg01 produces :
Volume groups --
Cur LV 5
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тАО03-08-2002 01:18 AM
тАО03-08-2002 01:18 AM
Re: The amazing dissapearing Logical volume
what's the output of
vgdisplay -v vg00
vgdisplay -v vg01
Regards
Rainer
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тАО03-08-2002 01:34 AM
тАО03-08-2002 01:34 AM
Re: The amazing dissapearing Logical volume
These are all fine and belong to a visible volume group.
I am pretty sure this is not an Oracle problem but something simpler regarding system setup.
The only thing that has happened recently is a power cut where my machine was killed (only a workstation and hash unit so no UPS). I have rebooted since then, about 4 times, but still no lost LV's
hmmmm
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тАО03-08-2002 01:35 AM
тАО03-08-2002 01:35 AM
Re: The amazing dissapearing Logical volume
cheers
John
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тАО03-08-2002 01:35 AM
тАО03-08-2002 01:35 AM
Re: The amazing dissapearing Logical volume
# ioscan -fnC disk
Check that all the disk are there and check the device file, ie. /dev/dsk/cXtXdX and /dev/rdsk/cXtXdX
If they are all there, do an vgdisplay
# vgdisplay -v /dev/vg00
# vgdisplay -v /dev/vg01
Check that the how many disks are in the VG and check how many LVs are in 1 VG. Calculate the PEs from the output to see if it matched.
Try to mount the missing LVs to a temp mount point to see if you can mount the LVs.
Have you reboot your server before? If you had reboot your server and did not add the FS in the fstab, it will not mount it after reboot.
Hope this helps.
Kenny.
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тАО03-08-2002 01:46 AM
тАО03-08-2002 01:46 AM
Re: The amazing dissapearing Logical volume
1- first thing i do is try to mount them:
mount /dev/vgxx/lvolmissing1 /tmp_mnt
Try with diferent options too:
mount -F HFS /dev/vgxx/lvolmissing1 /tmp_mnt
If it can be mounted then , just see what files contain and maybe you can known what s that.
If you cannot mount go to step 2:
2- dd if=/dev/vgxx/rlvolxx of=/tmp/test1 bs=1024k count=1
strings /tmp/test1 | head -10
If it was a oracle datafile you should see:
Z[\]
followed by a ORACLE_SID.
HTH