Evren Yurtesen wrote:
> John Pettitt wrote:
>> Evren Yurtesen wrote:
>>> I am using backuppc but it is extremely slow. I narrowed it down to disk
>>> bottleneck. (ad2 being the backup disk). Also checked the archives of
>>> the mailing list and it is mentioned that this is happening because of
>>> too many hard links.
>>>
>>>
>> [snip]
>>
>> The basic problem is backuppc is using the file system as a database -
>> specifically using the hard link capability to store multiple references
>> to an object and the link count to manage garbage collection. Many
>> (all?) filesystems seem to get slow when you get into the millios of
>> files with thousands of links range. Changing the way is works (say to
>> use a real database) looks like a very non trivial task. Adding disk
>> spindles will help (particularly if you have multiple backups going at
>> once) but in the end it's still not going to be blazingly fast.
>>
>> John
>>
>
> Well, so there are no plans to fix this problem? I found forum threads
> that in certain cases backups take over 24hours! Goodbye to daily
> incremental backups :)
If your filesystem isn't a good place to store files, there is not much
an application can do about it. Perhaps it would help if you mentioned
what kind of scale you are attempting with what server hardware. I know
there are some people on the list handling what I would consider large
backups with backuppc. If yours is substantially smaller perhaps they
can help diagnose the problem. Maybe you are short on RAM and swapping
memory to disk with large rsync targets.
> I wonder what is the mechanical stress this poses on the hard drive when
> it has to work 24/7 moving it's head like crazy.
They'll die at some random time averaging around 4-5 years - just like
any other hard drive. Disk heads are made to move...
--
Les Mikesell
[EMAIL PROTECTED]
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