Re: [Evms-devel] Multilevel snapshot?

[Jeremy J. <je...@co...>]

Rsync can also use a previous copy as a base for an incremental update, 
this is it's main purpose: copying only what has changed and saving 
bandwidth.  But you only get one copy as a result: "current".

But, rsync can also put the files in a separate directory tree, leaving 
the "base" unchanged... so it can do the same as xfs/ext2 dump: 
incremental backups.  Check the man page for this obscure stuff.

Cheers,

Jeremy Jackson

Murthy Kambhampaty wrote:
> I use rsync to do something similar.  With LVM1, the sequence is: create the
> snapshot, rsync from the snapshot to the destination, remove the snapshot.
> I think the EVMS analog to LVM1 snapshot creation is a snapshot "reset"
> (haven't gotten the sequence perfected under EVMS yet).
> 
> Provided you have the storage, the resulting "rsync snapshots" can be moved
> around all you want - they're full point-in-time copies of the original
> filesystem.
> 
> 
> 
> 
>>-----Original Message-----
>>From: Jeremy Jackson [mailto:je...@co...]
>>Sent: Wednesday, January 28, 2004 9:44 PM
>>To: Chris Beck
>>Cc: evm...@li...
>>Subject: Re: [Evms-devel] Multilevel snapshot?
>>
>>
>>xfsdump (and ext2 dump) can do incremental dumps, achieving the same 
>>result when used with a nightly recycled snapshot.  xfsdump 
>>has a nice 
>>inventory to keep track of all this.
>>
>>Regards,
>>
>>Jeremy Jackson
>>
>>Chris Beck wrote:
>>
>>>I am exceptionally interested in doing something similar to 
>>
>>this as well 
>>
>>>and was sniffing around the lvm mailing list.  I'd like to 
>>
>>copy a daily 
>>
>>>snapshot over to a remote machine for off-sit back-up.
>>>
>>>Machine 1
>>>current -r/w -> disk
>>>24hr snap being generated
>>>
>>>Machine 2
>>>1 week old -r/w -> disk
>>>7 24 hr snap shots
>>>
>>>Every night a new snap would be generated, the 24 hr old 
>>
>>one would be 
>>
>>>transferred to the remote machine and a week old snap would 
>>
>>be applied 
>>
>>>to the remote machine.
>>>
>>>Is it possible to treat snapshots like DB transaction logs 
>>
>>and ship them 
>>
>>>here and there?
>>
>>
>>
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>