Will do!

On 2017-03-08 22:34, Craig Barratt wrote:

Mph,

 

I probably will write a script that implements the hybrid upgrade, so even if you archive your V3 backups, please keep some of them around for testing :).

 

Craig

On Wed, Mar 8, 2017 at 7:55 AM, Michael Huntley <michael AT huntley DOT net> wrote:

Oh those pesky deltas!

I slept on it; it's better to make a break with the past.  I'm going to tar up the old data+hardlinks and put it to cold storage.

Time is a finite resource so I'd rather move forward than get stuck in the weeds of the past.

 

Pavel - have you considered using tar+tape to archive your data?  I deal with CPA's and lawyers so everything must be saved basically forever but it doesn't mean the data must be instantly available. Just a thought.

Cheers!

mph

On 2017-03-07 23:19, Craig Barratt wrote:

There are two options to implement this:

• truly convert v3 backups to v4 format.  This is quite complex since forward deltas (ie, incrementals) would have to be converted into reverse deltas; there are lots of cases to consider and testing them all would take a lot of time.  The effort and risk (of messing up an old backup) doesn't seem worth it. 
• hybrid - convert just the backup storage from V3 to V4, but keep the V3 logical dependency (ie: replace the V3 attrib file + hardlinks in each directory with just a V4 attrib file).  This is a good bit easier and lower risk, as each directory can be updated in a self-contained manner.  The testing would need to ensure that V3 viewing / restore etc works with this hybrid storage.

If there is enough interest I would consider implementing the hybrid approach.  But I'm working on rsync-bpc-3.1.2 right now.

 

Craig

On Tue, Mar 7, 2017 at 6:41 PM, Michael Huntley <michael AT huntley DOT net> wrote:

Hi Craig - 

among the billion other things to do in life - is this reasonably possible?  I looked at the perl and came to the considered conclusion, I'm just not a perl guy.  However, it would be great to convert older backups to v4 - that would reduce my workload on BTRFS snapshops, etc.  No hardlinks makes moving large sums of data so much easier......

 

2cents.....

mph

On 2017-03-06 01:58, Pavel Hofman wrote:

Hello,

please is it possible somehow to script the BackupPC_backupDuplicate
tool to be able to convert not only the last v3 backup to v4, but also
all previous backups? I would run the script in the background.

The intention is migrating from XFS to ZFS for server consolidation and
I am afraid I need to get rid of the hardlinks in the 10 yrs of
historical backups.

I have read about running an arbitrary filesystem over ZFS block device,
but  I am afraid of poor performance.

Thanks a lot.

Best regards,

Pavel.

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