Robin Lee Powell wrote:
>>>>> It is generally believed on this list (I believe) that it's not
>>>>> feasible to use something as 'high-level' as rsync to replicate
>>>>> BackupPC's pool. The amount of memory needed by rsync will just
>>>>> explode because of all the hardlinks. Usually people have been
>>>>> using low-level tools like dd or dump to copy a complete pool
>>>>> filesystem to another one.
>>>> Then this list believes wrongly; I've had no problems doing it
>>>> at all, for some weeks now. It's the getting it encrypted part
>>>> that's tricky.
>>>>
>>>> rsync has to think for a while, but it works, and I've never
>>>> noticed any memory problems on that machine. The machine does
>>>> have 2GiB of RAM, however.
>>> It will work up to some limit on filenames and hardlinks that
>>> backuppc archives are likely to exceed. There are 2 issues -
>>> there is a fixed memory overhead per filename that is handled in a
>>> single run and the mechanism to match up the linked files doesn't
>>> scale well.
>> My backuppc pool and pc directories together have 2442024 files, and
>> 10325584 KiB of data. While I accept that it's possible for one's
>> backups to scale beyond the point where rsync can handle them, as I
>> said, I've had no problems so far.
>
> Also, I said my machine had 2GiB of RAM earlier, but I ran this on a
> different machine yesterday with the same file pool:
>
> MemTotal: 451348 kB
>
> I think rsync's hardlink fixing isn't as inefficient as you think
> it is.
>
The last time I tried to copy mine, I gave up after it had been running
for 3 days. I'm not sure about the size, but I probably had more files
and less RAM.
--
Les Mikesell
[EMAIL PROTECTED]
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