Am 03.07.2014 um 21:19 schrieb John R Pierce <pierce@xxxxxxxxxxxx>:
> On 7/2/2014 12:53 PM, Lists wrote:
>> I'm trying to streamline a backup system using ZFS. In our situation,
>> we're writing pg_dump files repeatedly, each file being highly similar
>> to the previous file. Is there a file system (EG: ext4? xfs?) that, when
>> re-writing a similar file, will write only the changed blocks and not
>> rewrite the entire file to a new set of blocks?
>>
>> Assume that we're writing a 500 MB file with only 100 KB of changes.
>> Other than a utility like diff, is there a file system that would only
>> write 100KB and not 500 MB of data? In concept, this would work
>> similarly to using the 'diff' utility...
>
> you do realize, adding/removing or even changing the length of a single
> line in a block of that pg_dump file will change every block after it as
> the data will be offset ?
>
> may I suggest that instead of pg_dump, you use pg_basebackup and WAL
> archiving... this is the best way to do delta backups of a sql database
> server.
>
>
Additionally, I’d be extremely careful with ZFS dedup.
It uses much more memory than „normal“ ZFS and tends to consume more I/Os, too.
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