dump and restore

Lowell Gilbert freebsd-questions-local at be-well.ilk.org
Sat Jul 19 17:36:55 UTC 2008


Peter Boosten <peter at boosten.org> writes:

> Malcolm Kay wrote:
>> On Sat, 19 Jul 2008 06:51 am, Peter Boosten wrote:
>>>
>>> The /usr/ partition was 74Gb, and it took (according to dump
>>> 52631 seconds (~ 14.5 hours) to copy. Both disks are IDE, in
>>> the same machine on different IDE controllers.
>>>
>> The time for dump/restore normally depends more on the occupancy of
>> the partition than its actual size. This is one reason why we avoid
>> using dd for this purpose as we must then copy the entire
>> 74Gb rather than just that used.
>>
>
> Hmmm, I didn't even know it was possible to dump a partition
> unmounted. Try that next time then. The actual partition size was
> ~200GB, but around 74Gb data.

If you can, it's always *much* preferable to dump an unmounted
partition.  I suspect your problems here had more to do with the bad
disk, though.

-- 
Lowell Gilbert, embedded/networking software engineer, Boston area
		http://be-well.ilk.org/~lowell/


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