Thanks for all of this info guys, I'm still digesting it...

My source computer is running Solaris 10 ZFS version 15. Does this mean that I'd be asking for trouble doing a zfs send back to this machine from any other ZFS machine running a version > 15? I just want to make sure I understand all of this info...

If this is the case, what are my strategies? Solaris 10 for my temporary backup machine? Is it possible to run OpenIndiana or Nexenta or something and somehow set up these machines with ZFS v15 or something?

Nikola M.
April 7, 2011 5:28 AM

Yes, that is exactly why one thinking about using something with more liberal license then Solaris11 with payed license, should first install latest OpenSolaris form snv_134 (Or 2009.06 then upgrade to /dev Opensolaris 134) and then it can choose upgrade path to Both openIndiana oi_148(b) and S11Ex on same zpool.

That way, zpool and zfs versions can stay on versions supported by OI and Nexenta (and Schillix and FreeBSD and ZFS-Fuse on Linux and Zfs Native on Linux in development) and one can experiment with more systems supporting ZFS then only being locked in S11Ex.

If you sadly choose to install from closed S11Ex disc and not from Osol snv_134 CD
(www.genunix.org snv_134  .ISO) and upgrade to OpenIndiana OI_xxx dev. release and/orS11ex, then you might loose ability to use anything but closed Solaris from Oracle, so be clever and you can use upgrade path explained.

Of course, you can have as much Boot Environments (BE) on same zpool as you like, since they basically behave like separate OS installs to boot from the same zpool, that is the beauty of ZFS/(Open)Solaris based distributions.
Just do NOT do upgrade to newest closed zpool/zfs version from S11Ex!

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Brandon High
April 6, 2011 1:14 PM

How about getting a little more crazy... What if this entire server temporarily hosting this data was a VM guest running ZFS? I don't foresee this being a problem either, but with so

The only thing to watch out for is to make sure that the receiving datasets aren't a higher version that the zfs version that you'll be using on the replacement server. Because you can't downgrade a dataset, using snv_151a and planning to send to Nexenta as a final step will trip you up unless you explicitly create them with a lower version.
 
-B

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Joe Auty
April 5, 2011 3:38 PM

Hello,

I'm debating an OS change and also thinking about my options for data migration to my next server, whether it is on new or the same hardware.

Migrating to a new machine I understand is a simple matter of ZFS send/receive, but reformatting the existing drives to host my existing data is an area I'd like to learn a little more about. In the past I've asked about this and was told that it is possible to do a send/receive to accommodate this, and IIRC this doesn't have to be to a ZFS server with the same number of physical drives?

How about getting a little more crazy... What if this entire server temporarily hosting this data was a VM guest running ZFS? I don't foresee this being a problem either, but with so much at stake I thought I would double check :) When I say temporary I mean simply using this machine as a place to store the data long enough to wipe the original server, install the new OS to the original server, and restore the data using this VM as the data source.

Also, more generally, is ZFS send/receive mature enough that when you do data migrations you don't stress about this? Piece of cake? The difficulty of this whole undertaking will influence my decision and the whole timing of all of this. 


I'm also thinking that a ZFS VM guest might be a nice way to maintain a remote backup of this data, if I can install the VM image on a drive/partition large enough to house my data. This seems like it would be a little less taxing than rsync cronjobs?



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