Re: How to get into single user mode - RHEL 5.6

2011-06-26 Thread Donald Russell
Yes it is... rootvg :-) mounted at /

But, easier than that was CP IPL 100 PARM SINGLE, no messing around with
detaching/linking mdisks and so on.

But I'll look into Scot's advice of creating a single disk rescue system

On Sat, Jun 25, 2011 at 17:59, Richard Troth vmcow...@gmail.com wrote:

 Is the volume group of the damaged system the same as the volume group of
 the repairing system?

 -- R; 




 On Jun 25, 2011 5:49 PM, Donald Russell russell@gmail.com wrote:
  Thanks Scott There are other files systems that also use LVM, but I
 know
  the root file system is all on the 100 disk only.
 
  I can't actually unmount anything... but I can shut the whole server down
  and log it off.
  On my healthy system I can attach (link) the disk, but that's where
 you're
  saying I'll have a name conflict because there will already be rootvg
 volume
  group.
 
  Interrupted ... 
 
  Solved:
  #CP 100 PARM SINGLE
 
  Whuwho! I'm in and problem fixed.
 
 
  On Sat, Jun 25, 2011 at 13:48, Scott Rohling scott.rohl...@gmail.com
 wrote:
 
  If it's really a single disk LVM -- unmount it.. You need to do a
 pvscan,
  vgscan, and then vgchange -ay volume-group.. then mount
  /dev/volume-group/logical-volume. And if your other server already uses
  the same volume-group name - you will have to rename it before you can
  activate the new one. (if the lvm consists of more than the 100 disk -
  you
  need to link and activate those too..)
 
  Sounds like you did a zipl -X at some point, which eliminates the
 startup
  menu..
 
  Good luck!
 
  Scott Rohling
 
  On Sat, Jun 25, 2011 at 2:11 PM, Donald Russell russell@gmail.com
  wrote:
 
   RHEL 5.6 on zVM 6.1
  
   I made a change to /etc/pam.d/system-auth and didn't test it before
  logging
   off again. :-(
  
   Now, nobody can logon because they get an error, Module not found.
 (I
   must
   have fat-fingered the module name I was adding.
  
   OK, no big deal, signal shutdown user x within 300 to bring the server
  down
   and reboot in single user mode
  
   Except the server doesn't stop at the usual prompt asking what to
  boot,
   it just comes up. (Normally that's when I would say #CP VI VMSG 0 1 to
  come
   up in single user mode...
  
   So, I tried shutting it down and logging off, then attach the 100
 mdisk
   (boot and root file systems) to another running zLinux system.
  
   From the running zLinux system I linked to the other 100 disk in write
  mode
   (while its proper owner was logged off) and tried to mount the
 partition
  at
   /mnt... where I thought I could then correct the bad file.
  
   I said mount /dev/dasdm2 /mnt and was told I had to specify the file
  system
   type
   mount -t ext3 /dev/dasdm2 /mnt
   Nope... it says it can't find an ext3 file system there.
  
   I have no reason to think the data is damaged in anyway... but it is
 also
   an
   LVM disk
  
   So, I'm looking for some help in how to recover from this snafu. :-)
  
   Thank you
  
   --
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Re: How to get into single user mode - RHEL 5.6

2011-06-26 Thread Donald Russell
Some good ideas there Scott. :-)

Even though IPL cuu PARM SINGLE is great for getting me into single user
mode, the other nice thing about having the menu reinstated is it lets me
back out a kernel more easily... reboot... choose the older one ... done.
The few second delay in having it time out is not a concern at all.

Cheers,



On Sat, Jun 25, 2011 at 16:08, Scott Rohling scott.rohl...@gmail.comwrote:

 I meant unmount it from the system you were trying to recover it from --
 cuz
 you needed to mount is as an LVM -- not as a filesystem.   But - the
 duplicate vg apparently would have stopped you.  I forgot about the SINGLE
 parm -- nice one.

 Couple recommendations:

 -  ensure /etc/zipl.conf has the correct menu listings - and issue 'zipl'
  without the -X option.. hopefully that gives you the boot menu back -- but
 maybe you don't want it now that you have the magic incantation.
 -  you may want to define yourself a recovery server that doesn't use LVM
 --
 just have a minimal system on a single minidisk.   avoid volume group name
 conflicts completely.  Only bring it up when needed.

 Scott Rohling


 On Sat, Jun 25, 2011 at 3:46 PM, Donald Russell russell@gmail.com
 wrote:

  Thanks Scott There are other files systems that also use LVM, but I
  know
  the root file system is all on the 100 disk only.
 
  I can't actually unmount anything... but I can shut the whole server down
  and log it off.
  On my healthy system I can attach (link) the disk, but that's where
 you're
  saying I'll have a name conflict because there will already be rootvg
  volume
  group.
 
  Interrupted ... 
 
  Solved:
  #CP 100 PARM SINGLE
 
  Whuwho! I'm in and problem fixed.
 
 
  On Sat, Jun 25, 2011 at 13:48, Scott Rohling scott.rohl...@gmail.com
  wrote:
 
   If it's really a single disk LVM -- unmount it..   You need to do a
  pvscan,
   vgscan, and then vgchange -ay volume-group..   then mount
   /dev/volume-group/logical-volume.And if your other server already
  uses
   the same volume-group name - you will have to rename it before you can
   activate the new one.   (if the lvm consists of more than the 100 disk
 -
   you
   need to link and activate those too..)
  
   Sounds like you did a zipl -X at some point, which eliminates the
 startup
   menu..
  
   Good luck!
  
   Scott Rohling
  
   On Sat, Jun 25, 2011 at 2:11 PM, Donald Russell russell@gmail.com
   wrote:
  
RHEL 5.6 on zVM 6.1
   
I made a change to /etc/pam.d/system-auth and didn't test it before
   logging
off again. :-(
   
Now, nobody can logon because they get an error, Module not found.
 (I
must
have fat-fingered the module name I was adding.
   
OK, no big deal, signal shutdown user x within 300 to bring the
 server
   down
and reboot in single user mode
   
Except the server doesn't stop at the usual prompt asking what to
   boot,
it just comes up. (Normally that's when I would say #CP VI VMSG 0 1
 to
   come
up in single user mode...
   
So, I tried shutting it down and logging off, then attach the 100
 mdisk
(boot and root file systems) to another running zLinux system.
   
From the running zLinux system I linked to the other 100 disk in
 write
   mode
(while its proper owner was logged off) and tried to mount the
  partition
   at
/mnt... where I thought I could then correct the bad file.
   
I said mount /dev/dasdm2 /mnt and was told I had to specify the file
   system
type
mount -t ext3 /dev/dasdm2 /mnt
Nope... it says it can't find an ext3 file system there.
   
I have no reason to think the data is damaged in anyway... but it is
  also
an
LVM disk
   
So, I'm looking for some help in how to recover from this snafu. :-)
   
Thank you
   
   
 --
For LINUX-390 subscribe / signoff / archive access instructions,
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 LINUX-390
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 --
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How to get into single user mode - RHEL 5.6

2011-06-25 Thread Donald Russell
RHEL 5.6 on zVM 6.1

I made a change to /etc/pam.d/system-auth and didn't test it before logging
off again. :-(

Now, nobody can logon because they get an error, Module not found. (I must
have fat-fingered the module name I was adding.

OK, no big deal, signal shutdown user x within 300 to bring the server down
and reboot in single user mode

Except the server doesn't stop at the usual prompt asking what to boot,
it just comes up. (Normally that's when I would say #CP VI VMSG 0 1 to come
up in single user mode...

So, I tried shutting it down and logging off, then attach the 100 mdisk
(boot and root file systems) to another running zLinux system.

From the running zLinux system I linked to the other 100 disk in write mode
(while its proper owner was logged off) and tried to mount the partition at
/mnt... where I thought I could then correct the bad file.

I said mount /dev/dasdm2 /mnt and was told I had to specify the file system
type
mount -t ext3 /dev/dasdm2 /mnt
Nope... it says it can't find an ext3 file system there.

I have no reason to think the data is damaged in anyway... but it is also an
LVM disk

So, I'm looking for some help in how to recover from this snafu. :-)

Thank you

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www.marist.edu/htbin/wlvindex?LINUX-390
--
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http://wiki.linuxvm.org/


Re: How to get into single user mode - RHEL 5.6

2011-06-25 Thread Scott Rohling
If it's really a single disk LVM -- unmount it..   You need to do a pvscan,
vgscan, and then vgchange -ay volume-group..   then mount
/dev/volume-group/logical-volume.And if your other server already uses
the same volume-group name - you will have to rename it before you can
activate the new one.   (if the lvm consists of more than the 100 disk - you
need to link and activate those too..)

Sounds like you did a zipl -X at some point, which eliminates the startup
menu..

Good luck!

Scott Rohling

On Sat, Jun 25, 2011 at 2:11 PM, Donald Russell russell@gmail.comwrote:

 RHEL 5.6 on zVM 6.1

 I made a change to /etc/pam.d/system-auth and didn't test it before logging
 off again. :-(

 Now, nobody can logon because they get an error, Module not found. (I
 must
 have fat-fingered the module name I was adding.

 OK, no big deal, signal shutdown user x within 300 to bring the server down
 and reboot in single user mode

 Except the server doesn't stop at the usual prompt asking what to boot,
 it just comes up. (Normally that's when I would say #CP VI VMSG 0 1 to come
 up in single user mode...

 So, I tried shutting it down and logging off, then attach the 100 mdisk
 (boot and root file systems) to another running zLinux system.

 From the running zLinux system I linked to the other 100 disk in write mode
 (while its proper owner was logged off) and tried to mount the partition at
 /mnt... where I thought I could then correct the bad file.

 I said mount /dev/dasdm2 /mnt and was told I had to specify the file system
 type
 mount -t ext3 /dev/dasdm2 /mnt
 Nope... it says it can't find an ext3 file system there.

 I have no reason to think the data is damaged in anyway... but it is also
 an
 LVM disk

 So, I'm looking for some help in how to recover from this snafu. :-)

 Thank you

 --
 For LINUX-390 subscribe / signoff / archive access instructions,
 send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
 visit
 http://www.marist.edu/htbin/wlvindex?LINUX-390
 --
 For more information on Linux on System z, visit
 http://wiki.linuxvm.org/


--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
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http://wiki.linuxvm.org/


Re: How to get into single user mode - RHEL 5.6

2011-06-25 Thread Donald Russell
Thanks Scott There are other files systems that also use LVM, but I know
the root file system is all on the 100 disk only.

I can't actually unmount anything... but I can shut the whole server down
and log it off.
On my healthy system I can attach (link) the disk, but that's where you're
saying I'll have a name conflict because there will already be rootvg volume
group.

Interrupted ... 

Solved:
#CP 100 PARM SINGLE

Whuwho! I'm in and problem fixed.


On Sat, Jun 25, 2011 at 13:48, Scott Rohling scott.rohl...@gmail.comwrote:

 If it's really a single disk LVM -- unmount it..   You need to do a pvscan,
 vgscan, and then vgchange -ay volume-group..   then mount
 /dev/volume-group/logical-volume.And if your other server already uses
 the same volume-group name - you will have to rename it before you can
 activate the new one.   (if the lvm consists of more than the 100 disk -
 you
 need to link and activate those too..)

 Sounds like you did a zipl -X at some point, which eliminates the startup
 menu..

 Good luck!

 Scott Rohling

 On Sat, Jun 25, 2011 at 2:11 PM, Donald Russell russell@gmail.com
 wrote:

  RHEL 5.6 on zVM 6.1
 
  I made a change to /etc/pam.d/system-auth and didn't test it before
 logging
  off again. :-(
 
  Now, nobody can logon because they get an error, Module not found. (I
  must
  have fat-fingered the module name I was adding.
 
  OK, no big deal, signal shutdown user x within 300 to bring the server
 down
  and reboot in single user mode
 
  Except the server doesn't stop at the usual prompt asking what to
 boot,
  it just comes up. (Normally that's when I would say #CP VI VMSG 0 1 to
 come
  up in single user mode...
 
  So, I tried shutting it down and logging off, then attach the 100 mdisk
  (boot and root file systems) to another running zLinux system.
 
  From the running zLinux system I linked to the other 100 disk in write
 mode
  (while its proper owner was logged off) and tried to mount the partition
 at
  /mnt... where I thought I could then correct the bad file.
 
  I said mount /dev/dasdm2 /mnt and was told I had to specify the file
 system
  type
  mount -t ext3 /dev/dasdm2 /mnt
  Nope... it says it can't find an ext3 file system there.
 
  I have no reason to think the data is damaged in anyway... but it is also
  an
  LVM disk
 
  So, I'm looking for some help in how to recover from this snafu. :-)
 
  Thank you
 
  --
  For LINUX-390 subscribe / signoff / archive access instructions,
  send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
  visit
  http://www.marist.edu/htbin/wlvindex?LINUX-390
  --
  For more information on Linux on System z, visit
  http://wiki.linuxvm.org/
 

 --
 For LINUX-390 subscribe / signoff / archive access instructions,
 send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
 visit
 http://www.marist.edu/htbin/wlvindex?LINUX-390
 --
 For more information on Linux on System z, visit
 http://wiki.linuxvm.org/


--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
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--
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Re: How to get into single user mode - RHEL 5.6

2011-06-25 Thread Scott Rohling
I meant unmount it from the system you were trying to recover it from -- cuz
you needed to mount is as an LVM -- not as a filesystem.   But - the
duplicate vg apparently would have stopped you.  I forgot about the SINGLE
parm -- nice one.

Couple recommendations:

-  ensure /etc/zipl.conf has the correct menu listings - and issue 'zipl'
 without the -X option.. hopefully that gives you the boot menu back -- but
maybe you don't want it now that you have the magic incantation.
-  you may want to define yourself a recovery server that doesn't use LVM --
just have a minimal system on a single minidisk.   avoid volume group name
conflicts completely.  Only bring it up when needed.

Scott Rohling


On Sat, Jun 25, 2011 at 3:46 PM, Donald Russell russell@gmail.comwrote:

 Thanks Scott There are other files systems that also use LVM, but I
 know
 the root file system is all on the 100 disk only.

 I can't actually unmount anything... but I can shut the whole server down
 and log it off.
 On my healthy system I can attach (link) the disk, but that's where you're
 saying I'll have a name conflict because there will already be rootvg
 volume
 group.

 Interrupted ... 

 Solved:
 #CP 100 PARM SINGLE

 Whuwho! I'm in and problem fixed.


 On Sat, Jun 25, 2011 at 13:48, Scott Rohling scott.rohl...@gmail.com
 wrote:

  If it's really a single disk LVM -- unmount it..   You need to do a
 pvscan,
  vgscan, and then vgchange -ay volume-group..   then mount
  /dev/volume-group/logical-volume.And if your other server already
 uses
  the same volume-group name - you will have to rename it before you can
  activate the new one.   (if the lvm consists of more than the 100 disk -
  you
  need to link and activate those too..)
 
  Sounds like you did a zipl -X at some point, which eliminates the startup
  menu..
 
  Good luck!
 
  Scott Rohling
 
  On Sat, Jun 25, 2011 at 2:11 PM, Donald Russell russell@gmail.com
  wrote:
 
   RHEL 5.6 on zVM 6.1
  
   I made a change to /etc/pam.d/system-auth and didn't test it before
  logging
   off again. :-(
  
   Now, nobody can logon because they get an error, Module not found. (I
   must
   have fat-fingered the module name I was adding.
  
   OK, no big deal, signal shutdown user x within 300 to bring the server
  down
   and reboot in single user mode
  
   Except the server doesn't stop at the usual prompt asking what to
  boot,
   it just comes up. (Normally that's when I would say #CP VI VMSG 0 1 to
  come
   up in single user mode...
  
   So, I tried shutting it down and logging off, then attach the 100 mdisk
   (boot and root file systems) to another running zLinux system.
  
   From the running zLinux system I linked to the other 100 disk in write
  mode
   (while its proper owner was logged off) and tried to mount the
 partition
  at
   /mnt... where I thought I could then correct the bad file.
  
   I said mount /dev/dasdm2 /mnt and was told I had to specify the file
  system
   type
   mount -t ext3 /dev/dasdm2 /mnt
   Nope... it says it can't find an ext3 file system there.
  
   I have no reason to think the data is damaged in anyway... but it is
 also
   an
   LVM disk
  
   So, I'm looking for some help in how to recover from this snafu. :-)
  
   Thank you
  
   --
   For LINUX-390 subscribe / signoff / archive access instructions,
   send email to lists...@vm.marist.edu with the message: INFO LINUX-390
 or
   visit
   http://www.marist.edu/htbin/wlvindex?LINUX-390
   --
   For more information on Linux on System z, visit
   http://wiki.linuxvm.org/
  
 
  --
  For LINUX-390 subscribe / signoff / archive access instructions,
  send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
  visit
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  http://wiki.linuxvm.org/
 

 --
 For LINUX-390 subscribe / signoff / archive access instructions,
 send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
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Re: How to get into single user mode - RHEL 5.6

2011-06-25 Thread Scott Rohling
sorry - bad wording..   you needed to mount it as an LVM  -- not a dasd
device..

Scott Rohling

On Sat, Jun 25, 2011 at 5:08 PM, Scott Rohling scott.rohl...@gmail.comwrote:

 I meant unmount it from the system you were trying to recover it from --
 cuz you needed to mount is as an LVM -- not as a filesystem.   But - the
 duplicate vg apparently would have stopped you.  I forgot about the SINGLE
 parm -- nice one.

 Couple recommendations:

 -  ensure /etc/zipl.conf has the correct menu listings - and issue 'zipl'
  without the -X option.. hopefully that gives you the boot menu back -- but
 maybe you don't want it now that you have the magic incantation.
 -  you may want to define yourself a recovery server that doesn't use LVM
 -- just have a minimal system on a single minidisk.   avoid volume group
 name conflicts completely.  Only bring it up when needed.

 Scott Rohling


 On Sat, Jun 25, 2011 at 3:46 PM, Donald Russell russell@gmail.comwrote:

 Thanks Scott There are other files systems that also use LVM, but I
 know
 the root file system is all on the 100 disk only.

 I can't actually unmount anything... but I can shut the whole server down
 and log it off.
 On my healthy system I can attach (link) the disk, but that's where you're
 saying I'll have a name conflict because there will already be rootvg
 volume
 group.

 Interrupted ... 

 Solved:
 #CP 100 PARM SINGLE

 Whuwho! I'm in and problem fixed.


 On Sat, Jun 25, 2011 at 13:48, Scott Rohling scott.rohl...@gmail.com
 wrote:

  If it's really a single disk LVM -- unmount it..   You need to do a
 pvscan,
  vgscan, and then vgchange -ay volume-group..   then mount
  /dev/volume-group/logical-volume.And if your other server already
 uses
  the same volume-group name - you will have to rename it before you can
  activate the new one.   (if the lvm consists of more than the 100 disk -
  you
  need to link and activate those too..)
 
  Sounds like you did a zipl -X at some point, which eliminates the
 startup
  menu..
 
  Good luck!
 
  Scott Rohling
 
  On Sat, Jun 25, 2011 at 2:11 PM, Donald Russell russell@gmail.com
  wrote:
 
   RHEL 5.6 on zVM 6.1
  
   I made a change to /etc/pam.d/system-auth and didn't test it before
  logging
   off again. :-(
  
   Now, nobody can logon because they get an error, Module not found.
 (I
   must
   have fat-fingered the module name I was adding.
  
   OK, no big deal, signal shutdown user x within 300 to bring the server
  down
   and reboot in single user mode
  
   Except the server doesn't stop at the usual prompt asking what to
  boot,
   it just comes up. (Normally that's when I would say #CP VI VMSG 0 1 to
  come
   up in single user mode...
  
   So, I tried shutting it down and logging off, then attach the 100
 mdisk
   (boot and root file systems) to another running zLinux system.
  
   From the running zLinux system I linked to the other 100 disk in write
  mode
   (while its proper owner was logged off) and tried to mount the
 partition
  at
   /mnt... where I thought I could then correct the bad file.
  
   I said mount /dev/dasdm2 /mnt and was told I had to specify the file
  system
   type
   mount -t ext3 /dev/dasdm2 /mnt
   Nope... it says it can't find an ext3 file system there.
  
   I have no reason to think the data is damaged in anyway... but it is
 also
   an
   LVM disk
  
   So, I'm looking for some help in how to recover from this snafu. :-)
  
   Thank you
  
   --
   For LINUX-390 subscribe / signoff / archive access instructions,
   send email to lists...@vm.marist.edu with the message: INFO LINUX-390
 or
   visit
   http://www.marist.edu/htbin/wlvindex?LINUX-390
   --
   For more information on Linux on System z, visit
   http://wiki.linuxvm.org/
  
 
  --
  For LINUX-390 subscribe / signoff / archive access instructions,
  send email to lists...@vm.marist.edu with the message: INFO LINUX-390
 or
  visit
  http://www.marist.edu/htbin/wlvindex?LINUX-390
  --
  For more information on Linux on System z, visit
  http://wiki.linuxvm.org/
 

 --
 For LINUX-390 subscribe / signoff / archive access instructions,
 send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or
 visit
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 --
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send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit

Re: How to get into single user mode - RHEL 5.6

2011-06-25 Thread Richard Troth
Is the volume group of the damaged system the same as the volume group of
the repairing system?

-- R; 




On Jun 25, 2011 5:49 PM, Donald Russell russell@gmail.com wrote:
 Thanks Scott There are other files systems that also use LVM, but I
know
 the root file system is all on the 100 disk only.

 I can't actually unmount anything... but I can shut the whole server down
 and log it off.
 On my healthy system I can attach (link) the disk, but that's where you're
 saying I'll have a name conflict because there will already be rootvg
volume
 group.

 Interrupted ... 

 Solved:
 #CP 100 PARM SINGLE

 Whuwho! I'm in and problem fixed.


 On Sat, Jun 25, 2011 at 13:48, Scott Rohling scott.rohl...@gmail.com
wrote:

 If it's really a single disk LVM -- unmount it.. You need to do a pvscan,
 vgscan, and then vgchange -ay volume-group.. then mount
 /dev/volume-group/logical-volume. And if your other server already uses
 the same volume-group name - you will have to rename it before you can
 activate the new one. (if the lvm consists of more than the 100 disk -
 you
 need to link and activate those too..)

 Sounds like you did a zipl -X at some point, which eliminates the startup
 menu..

 Good luck!

 Scott Rohling

 On Sat, Jun 25, 2011 at 2:11 PM, Donald Russell russell@gmail.com
 wrote:

  RHEL 5.6 on zVM 6.1
 
  I made a change to /etc/pam.d/system-auth and didn't test it before
 logging
  off again. :-(
 
  Now, nobody can logon because they get an error, Module not found. (I
  must
  have fat-fingered the module name I was adding.
 
  OK, no big deal, signal shutdown user x within 300 to bring the server
 down
  and reboot in single user mode
 
  Except the server doesn't stop at the usual prompt asking what to
 boot,
  it just comes up. (Normally that's when I would say #CP VI VMSG 0 1 to
 come
  up in single user mode...
 
  So, I tried shutting it down and logging off, then attach the 100 mdisk
  (boot and root file systems) to another running zLinux system.
 
  From the running zLinux system I linked to the other 100 disk in write
 mode
  (while its proper owner was logged off) and tried to mount the
partition
 at
  /mnt... where I thought I could then correct the bad file.
 
  I said mount /dev/dasdm2 /mnt and was told I had to specify the file
 system
  type
  mount -t ext3 /dev/dasdm2 /mnt
  Nope... it says it can't find an ext3 file system there.
 
  I have no reason to think the data is damaged in anyway... but it is
also
  an
  LVM disk
 
  So, I'm looking for some help in how to recover from this snafu. :-)
 
  Thank you
 
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 --
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