Alternate way to create a clone of a UNIX System

Question

THE STORY:
(If you don't like to read much, down below is the question :) )

Where I work we have two HP RP2470 servers same hardware same number of hard drives same everything :).

One of them is a production server and runs HP-UX 11.00. The poor ba***rd hasn't been turned off for years and now I have to make a clone of it on the other server - just in case, for redundancy.

The problem is simple (or not simple) as I have to make the the other server exactly the same. However the old version of OS (UX 11.00 is a history now) and the old software running on it, have made my task almost impossible.

On the production server there is also a cloning/recover utility Ignite-UX. I tried many times to create a recovery tape with it. Then when I load the tape on the backup server, it succeeds with the loading of the tape (no errors no warnings) but on the next restart it fails to load the OS :S and drops into HP`s ISL prompt.

---
THE QUESTION:
Is there an alternate way to create a clone of the Unix System?

The environment is:
1. 2x HP RP2470 Servers (non-Intel), same hardware, same number od HDDs (two each of them) same everything.
2. OS running: HP-UX 11.00

The production server has to be cloned without downtime - sadly :( as I hope that they will reconsider on this one

For example (like on Windows platforms),
if you try to copy an entire HDD with Windows inside on another HDD, and then put that HDD on another PC it will still work, as long as the hardware is the same.

Can I do something like that with a Unix system? Can I somehow COPY the contents of the entire HDD, put those on another HDD, and then just load the HDD into the other server? (If you haven't read the story the servers are exactly the same)

Will it work? Can it be done with ordinary commands like cp or dump or something like that? Does any one have a similar experience?

---
UPDATE: 26.01.2012

NOTE: The update is related to "The Story". If you haven't read that part then you can skip this update.

This is just a short update on the recover logs from the Ignite Tape.. someone with more exp. might notice something..

...

--- READING CONTENTS OF THE IGNITE TAPE ---
--- OUTPUT OMITED ---

...

...

x ./configure3, 413696 bytes, 808 tape blocks
x ./monitor_bpr, 20480 bytes, 40 tape blocks
       * Download_mini-system:  Complete
       * Loading_software:  Begin
       * Installing boot area on disk.
       * Enabling swap areas.
       * Backing up LVM configuration for "vg00".
       * Processing the archive source (Recovery Archive).
       * Wed Jan 25 15:27:32 EST 2012: Starting archive load of the source 
         (Recovery Archive).
       * Positioning the tape (/dev/rmt/0mn).
       * Archive extraction from tape is beginning. Please wait.
       * Wed Jan 25 15:39:52 EST 2012: Completed archive load of the source 
         (Recovery Archive).
       * Executing user specified script: 
         "/opt/ignite/data/scripts/os_arch_post_l".
       * Running in recovery mode (os_arch_post_l).
       * Running the ioinit command ("/sbin/ioinit -c")
       * Creating device files via the insf command.
insf: Installing special files for sdisk instance 0 address 0/0/1/1.15.0
insf: Installing special files for sdisk instance 1 address 0/0/2/0.1.0
insf: Installing special files for sdisk instance 2 address 0/0/2/1.15.0
insf: Installing special files for stape instance 0 address 0/0/1/0.3.0
insf: Installing special files for btlan instance 0 address 0/0/0/0
insf: Installing special files for btlan instance 1 address 0/2/0/0
insf: Installing special files for pseudo driver dlpi
insf: Installing special files for pseudo driver kepd
insf: Installing special files for pseudo driver framebuf
insf: Installing special files for pseudo driver sad
       * Running "/opt/upgrade/bin/tlinstall -v" and correcting transition link
         permissions.
       * Constructing the bootconf file.
       * Setting primary boot path to "0/0/1/1.15.0".
       * Executing: "/var/adm/sw/products/PHSS_20146/pfiles/iux_postload".
       * Executing: "/var/adm/sw/products/PHSS_25982/pfiles/iux_postload".
NOTE:    tlinstall is searching filesystem - please be patient
NOTE:    Successfully completed
       * Loading_software:  Complete
       * Build_Kernel:  Begin
NOTE:    Since the /stand/vmunix kernel is already in place, the kernel will 
         not be re-built. Note that no mod_kernel directives will be processed.
       * Build_Kernel:  Complete
       * Boot_From_Client_Disk:  Begin
       * Rebooting machine as expected.
NOTE:    Rebooting system.
sync'ing disks (0 buffers to flush):

0 buffers not flushed

0 buffers still dirty



Closing open logical volumes...

Done




Console reset done.

Boot device reset done.



********** VIRTUAL FRONT PANEL **********
System Boot detected
*****************************************
LEDs:  RUN      ATTENTION     FAULT     REMOTE     POWER
       FLASH    OFF           OFF       ON         ON
LED State: Running non-OS code. (i.e. Boot or Diagnostics)

...

...

...

--- SERVER IS PERFORMING POST SEQUENCE HERE ---
--- OUTPUT OMITED ---

...

...

...

*****************************************

************ EARLY BOOT VFP *************
End of early boot detected
*****************************************

Firmware Version  43.50

Duplex Console IO Dependent Code (IODC) revision 1

------------------------------------------------------------------------------
   (c) Copyright 1995-2002, Hewlett-Packard Company, All rights reserved
------------------------------------------------------------------------------

  Processor   Speed            State           CoProcessor State  Cache Size
  Number                                       State              Inst    Data
  ---------  --------   ---------------------  -----------------  ------------
      0      650  MHz   Active                 Functional         750 KB 1.5 MB
      1      650  MHz   Idle                   Functional         750 KB 1.5 MB

  Central Bus Speed (in MHz)  :        120  
  Available Memory            :    2097152  KB
  Good Memory Required        :      16140  KB

   Primary boot path:    0/0/1/1.15          
   Alternate boot path:  0/0/2/1.15          
   Console path:         0/0/4/1.643         
   Keyboard path:        0/0/4/0.0           


Processor is starting autoboot process.

To discontinue, press any key within 10 seconds.

10 seconds expired.
Proceeding...

Trying Primary Boot Path
------------------------

Booting... 
Boot IO Dependent Code (IODC) revision 1


HARD Booted.

ISL Revision A.00.38  OCT 26, 1994 

ISL booting  hpux



ISL>

Solution 1

I assume the disks are SCSI ?

If possible hook both disks up on a 3rd machine (Intel box) and use a Linux live-CD (PartedMagic is ideal for this) to boot that system. Then make a RAW disk 2 disk copy wit GPartEd (or even DD if the disk-format isn't recognized).

That is the easy and probably most reliable way. Of course this means downtime for the production server.

If disk2disk isn't an option the recovery tape would be the only thing I guess. But how can you be certain you have a good image if you are making it from a live environment ?

I don't have any experience with HP-UX, but many old Unix systems (Ultrix, BSD, Sco Openserver, Solaris) in the days of yore could be "cloned" if they were running a mirrored disk-system using the following trick:

On the primary system just shut it down. Pull the mirror-half from the system and stuff it in the other box (take care to place the disks in the secondary system in exactly the same slots as they originally were on the primary).

Then add empty (zero-filled) disks to both machines to restore the mirrors. Start them up. (you might need to fiddle a bit to get it to boot from the working mirror-half: Rebuild mirrors and you are OK. (Just don't put both machines on the same network as their ip-addresses, nodename would conflict.)

---

Another thing to worry about: If that server hasn't been down for years there is a major chance that the disks won't spin-up anymore after they have been off for some time. Just a few seconds of stand-still could be enough to seize up the disks.

---

Regardless what you do: Whoever made the decision to keep running on this antique without proper backups/redundancy for years should be shot, drawn and quartered.

Solution 2

There are other two alternative way to clone an HP-UX system but you need to verify you requirements.

1. The option "drd rehost" of the most recent version of Dynamic root disk software

2. You can create a "golden image" (this feature is included in the software Ignite-UX) of the source HP-UX and install it on the target HP-UX using two ways: network boot ( http://www.hpuxtips.es/?q=node/180 ) or dvd boot ( http://www.hpuxtips.es/?q=node/75 ). http://docstore.mik.ua/manuals/hp-ux/en/5992-5309/ch11.html is a reference about golden image but you could find the most updated version in the last Ignite-UX User Manual

Usually I prefer the second way but I don't know you environment.

Solution 3

Where it is possible to clone the disk... I don't recommend doing such. (look at dd) Like windows, and nearly every OS that I am aware of... there are files in-use while the OS is running, and the best way to do a "clone" is to be not booted into the OS... and then use whatever disk cloning util you like. If all else fails... dd works quite well. (linux direct dump utility)

Imho... it's better to backup the services you need (mysql, web-root for apache/nginix, config files... etc...) and restore them on the other server with a clean base install of the OS.

Solution 4

I know Mondo Rescue is a powerful disaster recovery suite for Linux (i386, x86_64, ia64) and FreeBSD.

According to Mondo Rescue Trac site archives, mondo is comparing itself to HP Ignite-UX.Ignite-UX looks like the tool you are searching for.

Solution 5

There are plenty of options to do this.

The one that is always available is dd - but the hard disks must be identical in size and sector size in that case.

Another popular option is partimage, which can do disk-to-disk and partition-to-partition cloning - including over the network.

For somebody with not a lot of Unix experience, perhaps downloading a recent boot cd of clonezilla, or systemrescuecd, might be the easiest option.

View more solutions

Comments

[NoNoNo]

The two software are supported by HP in order to do cloning of systems.

[Tonny]

Normal Linux live-CD's are not going to work on these. Non-Intel hardware.

[adaptr]

Then consider them added for completeness. The OP said I could skip the boring long explanation, so I did! The "The question" does not mention non-Intel hardware, or HP-UX :)

[Tonny]

:-) I have done it a couple of times myself (Ultrix and OpenServer). And I have seen it done on Solaris and BSD. But we were praying to every God in digital Heaven while doing it. :-) Still gives me the shivers when I think about those days...

[voretaq7]

I'll admit to having done it. I won't admit how many times.

[Tonny]

You're right. It wasn't in the actual question :-) I would have missed it too if I hadn't remembered from a previous job that these RP2470's are non-Intel.

[Spirit]

Thanks for the advice @Tonny . I will have to scroll and review through all of the answers and suggestions, talk with my superiors and decide my next steps. It is pretty old system, non Intel as you may have noticed.. Doesn't have VGA output either. :D I should add those few details into my question too.

[Spirit]

Yes.. forgive me I will add those few details in my question too. Thanks for the feedback btw.

[Spirit]

To @Tonny | Just wait... Only now I did read thoroughly through your explanation. Yes the production server IS running mirroring on the two HDDs it has. So if I understand you correctly: I have to pull out the secondary HDD from the production server, stuff it in to the secondary slot of the second server and then put new empty disks on both machines, and THEN TURN BOTH OF THE SERVERS ON! So that the when they boot up the mirrors will rebuild by themselves, since they will detect that their "other" half is missing? :O :O :O WOW!

[Tonny]

It ain't automatic. You will have to do a fair amount of dark magic at the Bios, controller and/or OS level to get things to boot and/or rebuild. And what exactly you need to do is different for every system. Don't even contemplate attempting this unless you have large experience in rebuilding broken mirrors on this particular hardware and OS. It can be done, but it is scary as hell.

[Spirit]

There is absolutely no errors or warnings of any kind.. everything goes well, with the creation of the tape as well as when restoring from the tape.. I will post an update of the restore logs see if you can notice something as I don't see any errors .. It just on the final when it needs to boot it drops into ISL. I also tried to modify the autoboot parametars.. but no luck

[Spirit]

I've tried... It waits for a few seconds (like it is trying to boot) but then returns to ISL> prompt again...