[CentOS] CentOS and LessFS

Nataraj incoming-centos at rjl.com
Wed Jan 18 03:43:55 UTC 2012

On 01/17/2012 07:31 PM, Les Mikesell wrote:
> Nothing will fix a file if the disk underneath goes bad and you aren't
> running raid.  And in my case I run raid1 and regularly swap disks out
> for offsite copies and resync.  But, backuppc makes the links based on
> an actual comparison, so if an old copy is somehow corrupted, the next
> full will be stored separately, not linked.
ZFS has an option to turn on full data comparison instead of just checksums.
>> At this point I am only reading the experience of others, but I am
>> inclined to try it.  I backup a mediawiki/mysql database and the new
>> records are added to the database largely by appending.  Even with
>> compression, it's a pain to backup the whole thing every day.  Block
>> level dedup seems like it would be a good solution for that.
> You are still going to have to go through the motions of copying the
> whole thing and letting the receiving filesystem do hash comparisons
> on each block to accomplish the dedup.
I'm not sure about that.  They support deduplication over the network. 
There is a command somethink like 'zfs send', but maybe it requires that
the filesystem you are backing up is also zfs.


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