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Void's Forums • View topic - Is there a "online" 'dd'

Is there a "online" 'dd'

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Is there a "online" 'dd'

Postby Basher52 » Fri Nov 26, 2010 5:00 pm

kinda related to

I wonder if there is a 'dd' utility that can be run when the server is up and running? I need to 'dd' the boot disk again it seems. Have gotten mails from "S.M.A.R.T." that there are some sector problems with the boot disk.
I had it offline last time and the 'dd' took 45 mins if I can recall that correctly and that is way too much.


and oh...no, think this is better in a new thread...
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Postby Basher52 » Sat Nov 27, 2010 5:54 pm

Any thoughts of this?
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Postby Void Main » Sat Nov 27, 2010 6:37 pm

You can dd a running system but it's not a good idea. What you probably want to check out are file system "snapshots".
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Postby Basher52 » Sat Nov 27, 2010 6:41 pm

If it's not a good idea then I'll do it offline :)
thx
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Postby Void Main » Sat Nov 27, 2010 6:58 pm

It's perfectly safe if you do it using an LVM snapshot:

http://tldp.org/HOWTO/LVM-HOWTO/snapshots_backup.html
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Postby Basher52 » Sat Nov 27, 2010 7:22 pm

I don't use LVM, I use RAID5 trough hardware.
Just to be sure I'm gonna use the "offline" way :P
but I'll do that tomorrow I think
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