I do agree that it would be better ideally to disable BackupPC's pooling 
mechanism in the case of ZFS, but it sounds as though we don't really have that 
capability (at least not without some serious hacking).  Maybe when the 
ethereal 4.0 arrives, it'll be a different story. ;)  As I've come to 
understand the ZFS syncing abilities, it sounds like an analogous way to 
describe it is "rsync meets dd", so the aspects of the filesystem that hang up 
rsync become irrelevant to zfs send/receive.

Thanks,

--Mark


-----Original Message-----
From: Tyler J. Wagner [mailto:tyler AT tolaris DOT com] 
Sent: Thursday, March 07, 2013 10:14 AM
To: General list for user discussion, questions and support
Cc: Mark Campbell
Subject: Re: [BackupPC-users] BackupPC Pool synchronization?

On 2013-03-07 14:34, Mark Campbell wrote:
> My thinking at this point is that I'll leave the pooling be--it may 
> require some extra CPU cycles & RAM from time to time, but my 
> understanding of the zfs dedup & compress features are that they 
> should be transparent to BackupPC, so while pooling in BackupPC won't 
> avail much, it probably wouldn't hurt anything either.

Except that it's the pooling (hardlinking) that makes pool synchronization suck 
so badly. Although perhaps ZFS mirror might make that better, I'd much rather 
disable pooling entirely (disable the linking process), and then just use rsync 
to sync the backuppc/pc tree between primary and secondary hosts.

Regards,
Tyler

--
"... I've never seen the Icarus story as a lesson about the limitations of 
humans. I see it as a lesson about the limitations of wax as an adhesive."
   -- Randall Munroe, "XKCD What IF?: Interplanetary Cessna"

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