Backup with dd?
Eric F Crist
ecrist at secure-computing.net
Mon Jan 3 11:04:25 PST 2005
On Jan 3, 2005, at 12:46 PM, Andrew P. wrote:
> Eric F Crist wrote:
>> On Jan 3, 2005, at 12:15 PM, Henry Miller wrote:
>>> This might work, but it isn't best. I can think of the following
>>> You have no protection at all while the copy is in progress. You
>>> overwritten part of the old backup, but not enough to be consistent.
>>> You have made no provision for data loss because of anything other
>>> a failing drive. If your house burns down you can't get your data.
>>> (not strictly true, you can recover accidently deleted files so long
>>> you do the undelete before the next time you do the backup)
>>> FreeBSD has a few different RAID options. With the right setup you
>>> can achieve disk reliability, and not have to switch cables on
>> You seem to be under the impression that I'm doing this for the sole
>> reason of a disk crash. I'm actually doing it for more than just
>> that reason. For example, if my system gets hacked, most hackers
>> will probably not care about an unmounted hard drive, and screw with
>> the current mounted partitions. Also, these drives wouldn't really
>> be at the same point of this hypothetical drive failure, since one
>> hard drive will only be used roughly once a week, while the other is
>> in a constant state of use. Most of my user-data is destined for a
>> RAID-5 array that's roughly 1.2TB, so that's got it's own backup.
>> This is simply for use in an emergency, so I don't HAVE to rebuild.
>> Quite frankly, I don't have time to sit here and rebuild this system
>> again any time soon. This configuration I'm trying is ideal, with
>> minimal interference. I'm going to be installing removable drive
>> bays so that my roommate is able to simple swap drive positions and
>> reboot the system (it's headless, and he's not very tech savvy in
>> this regard).
> Backing up with dd is ultimately straightforward, but is not a good
> idea at all. The matter is when dd is running, the source may be
> modified and the copy might be inconsistent. Software RAID should be
> the best option for your task: you can mirror a drive to a second one
> and then just plug the second one out of your computer.
> Best wishes,
> Andrew P.
Is this vinum? Fairly difficult to setup, or is it straight-forward?
Before I delve into that, any setup recommendations?
Eric F Crist "I am so smart, S.M.R.T!"
Secure Computing Networks -Homer J Simpson
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