Home.... | log in.... | Pub my question! | Sign-up....

Java-index >> General >> Talk to the Sysop

Recovering OS

Your Machine A crashes and would not come up again. Assuming you have a copy of the OS (ufsdump) of Machine A on Machine B. How can I restore Machine A with the ufsdump image on Machine B? Is this possible? If so, I need step by instructions please.Cheers

[276 byte] By [soopergal] at [2007-11-25 23:39:49]

«« no seq command in solaris?
»» Root Password expired. Need help recovering. System Locked Down

# 1

I'd find out why it crashed first, might be as simple as fsck or repairing the boot block from one of the backup blocks. ufsrestore opens up a whole nother can of worms that by your question you are not going to like...

Read up on fsck for repaing boot blocks.

fsck [-F ufs] -o b=32 /dev/rdsk/yourrootdrive

richpierson at 2007-7-5 18:47:46 >

top of Java-index,General,Talk to the Sysop...

# 2

I'd say using "dd" would be a better option. Back in the day, when there were no flash archives, etc -- a lot of disk duplication would occur via dd. Normally it would be disk-to-disk. But I don't see why you cannot use a file instead of a disk to dump your output (of=myarchive.dd)

[[The limitations of dd would apply of course...]]

Of course you'd have to make sure the disk onto which you would restore your "dd" image had the same geometry as the failed drive.

If you were merely interested in something like Disaster recovery, investigate Flash Archives to restore your OS (I think with Solaris 10, you can restore LVM'ed images via flash as well).

implicate_order at 2007-7-5 18:47:46 >

# 3

Thanks everyone for the replies. This is a hypothetical question. I'm trying to explore the ufsdump option. Please help me out if you have time :-) Appreciate it.

I'm trying to do a ufsdump say the root partition over a network. This is what I have done so far:

--> on the machine where I'm getting the data from

share slice --> vi /etc/dfs/dfstab

share -F nfs -d "root" /

/etc/init.d/nfs.server start

then

--> on the machine I'm trying to dump to

mount /dev/dsk/c0t1d0s3 /restore

mount 192.168.0.72:/ /root

So far so good.

--> Now i try to dump root to /restore:

ufsdump 0f - /root | (cd /restore; ufsrestore xf -)

and i get the following:

DUMP: `/root' is not on a locally mounted filesystem

DUMP: The ENTIRE dump is aborted.

Any ideas what I can do?

Thanks

soopergal at 2007-7-5 18:47:46 >

# 4

Actually sorry about the stupid question. ufsdump doesn't understand NFS (obviously). Anyway, how can I dump the file system remotely to another machine?

soopergal at 2007-7-5 18:47:46 >

# 5

Actually what's wrong with this command? ufsdump 0f root@machineA:/root /dev/md/dsk/d0I get a 'cannot open /root' error although the directory is there. Any ideas?

soopergal at 2007-7-5 18:47:46 >

# 6

Guess what a google search of "ufsdump across network"

got me?

http://www.sunmanagers.org/archives/1997/1265.html

http://supportforum.sun.com/network/index.php?t=msg&th=916&start=0& rid=0

http://unix.derkeiler.com/Mailing-Lists/SunManagers/2005-05/0340.html

HTH

implicate_order at 2007-7-5 18:47:46 >

# 7

[[[Guess what a google search of "ufsdump across network"got me?]]]Moral of the story is -- Use the internet to do your research -- it's a great tool!

implicate_order at 2007-7-5 18:47:46 >

# 8

Thanks

soopergal at 2007-7-5 18:47:46 >

Java programming resources: FAQs, tutorials, compiler and browser download sites, documentation, books lists, IDEs, etc.

Recovering OS

General New Topic

General Hot Topic

General

All Classified