Re: server crashed - recovering from backup by SuperGumby
SuperGumby
Tue Jul 01 05:33:24 PDT 2008
The 'portability' of an OS install has always had issues. I remember years
ago deleting all devices from devmgr on Win95 and _expecting_ to be able to
throw the drive into completely different hardware, let Prug'n'Pray sort it
out.
NT4 was both more finicky and more robust. More finicky due to HAL but if
you knew the rules this sort of 'forklift' was still possible. More robust
because, again, if you knew the rules, such a move would result well. In
this aspect Windows 2000 was more of a PITA, and I'm not suggesting it is a
'breeze' with 2003.
Over the years I have had to do 'repair' or 'parallel' installations, load
reg keys, rename files so that drivers for DeviceB would appear to be those
of DeviceA. I have watched such moves _mostly_ work and die in the final
stages (most frustrating). I have also heard or even observed people 'almost
there' give up in despair, to watch me complete the final step that gets it
back.
HOWEVER, I also only do the impossible on even numbered days. I've had m'
failures too.
A key point here is that _should the process succeed_ we are _not only_
dealing with the OS, there's all these 'apps' and 'services' and 'bindings'
that need to be handled properly as well. This is often not easy.
MS actually have information for 'restoring your server to different
hardware', it is full of caveats and cautions and is not simple.
Recently, 'drive imaging' programs have also improved such but IME all they
actually do is perform the regedits for you.
<vcsekhar@gmail.com> wrote in message
news:5b618a0c-0295-4c83-9b3d-77b541524258@y22g2000prd.googlegroups.com...
Hi Super,
You are right I got the RAID numbers jumbled up, it is a Mirror so I
have 2 HDD's with exactly the same data and I know that both are ok.
Thanks for the detailed answer. I will try it out first when I get the
new server, but, I am still hoping that the server is fixable atleast
temporarily so that I can first get my network back and then
transition to a new server.
You are a SBS MVP so you may have an idea why this is so convoluted in
the server OS when it is so simple to recover from a backup to a new
computer or a new os install on a desktop OS machine.
It would have been so simple if I could just install the OS on a new
machine with the same server name and same domain name and then just
import all the AD users and such configuration settings into the new
server and then connect it to the network.
Is there a technical reason why this is so? Or are there other backup
professional (expensive!!!) programs available that will allow this on
the server OS's?
Well maybe the next version will fix this.
Thanks for your help.
chandrasekhar
On Jul 1, 12:12 pm, "SuperGumby [SBS MVP]" <n...@your.nellie> wrote:
> I _HOPE_ that you in fact have RAID1 (which is mirroring, rather than
> RAID0
> which is striping).
>
> Given both HDDs from a RAID1 pair I would probably set one aside (as my
> fallback) and simply connect the other to the new system. I KID YOU NOT!
> it's _likely_ to work.
>
> The 'secrets' are to _ONLY_ start in Directory Services Restore Mode (we
> are
> not actually going to restore anything) _NOT_ 'SAFE MODE', and if she
> BSOD's
> on startup it is (again) _likely_ that a 'repair install' will get the
> system operational. The DSRM startup, if it gets past BSOD, will allow
> hardware changes to be detected and support for the changed devices to be
> recognised by the system. Keep restarting in DSRM until such time as no
> further hardware changes are detected and pay _particular_ attention to
> networking. You DO NOT want to restart normally until the 'internal' NIC
> is
> recognised.
>
> This is your friend:
> To view a list of previously attached (nonpresent) devices
> At the command prompt, type:
> Devmgmt.msc set DEVMGR_SHOW_NONPRESENT_DEVICES=1
> In Device Manager, on the View menu, select Show hidden devices.
> Remove any old devices, _IF_ you get this far, which is likely.
>
> The major factors which impact the success rate of this are:
> ENSURE you only start in DSRM.
> PATIENCE. Sometimes the detection of the hardware changes takes time, 10
> minutes is not unusual. Just let the system detect changes and load
> drivers.
> Then, let it sit there a bit, and restart again (in DSRM). More devices
> may
> be recognised. Do not start normally until s restart in DSRM has not
> detected further change.
> HDD subsystem. You are _most likely_ to succeed if the RAID controller is
> movable between systems. This doesn't mean to say that 'disparate'
> controllers won't work.
> HAL. Our old mate HAL can be a bit of a problem. If the HAL from the old
> system is not 'optimal' for the new but is 'acceptable' it is quite likely
> that you will get up and running.
>
> Both HAL and HDD subsystem can _probably_ be updated by a 'repair
> install',
> if necessary. Patience comes at a price. The need to _only use_ DSRM is
> tantamount, miss that option and you not only may be waiting a _long_ time
> to be able to log on but it is likely to muck up the 'bindings' of various
> services.
>