topic Re: replication between different versions of DOT in VMware Solutions Discussions

replication between different versions of DOT

nsitps1976 — Thu, 05 Jun 2025 07:09:55 GMT

Can I just check that you can replicate between different versions of DataONTAP?

For example between FAS2050 which can run DOT8.0 and a FAS2020 which runs DOT7.3

Re: replication between different versions of DOT

erick_moore — Thu, 26 Aug 2010 16:51:38 GMT

You can do it with qtree SnapMirror. There are limitiations with volume SnapMirror since it replicates the volume metadata. Also, I don't think the 2050 supports OnTap 8.

Thanks,

E-

Re: replication between different versions of DOT

pascalduk — Fri, 27 Aug 2010 05:50:43 GMT

For volume snapmirror the destination filer needs to be on the same or a higher Ontap version as the source filer.

From the FAS20x0 series only the FAS2040 supports ontap 8.

Re: replication between different versions of DOT

nsitps1976 — Fri, 27 Aug 2010 09:08:44 GMT

My mistake, I did mean the 2040.

So I would want to do volume replication from a 2040 (dot8) to a 2020 (dot7.3) - Which from what you are saying this can not be done unless the 2040 is downgraded to dot7.3?????

Re: replication between different versions of DOT

erick_moore — Fri, 27 Aug 2010 14:48:01 GMT

You CAN do it if you use QSM (QTree SnapMirror) instead of VSM (Volume SnapMirror). As an example, lets say you have a LUN in the root of a Flexvol on a system running 8.0, 7-Mode. You want to SM that LUN to a system running 7.3.3. You cannot use VSM since 7.3.3 does not know about the volume structure in a system running a higher OnTap release. In this case you would need to move your LUN to a Qtree (which can be done non-disruptively), and then you could use QSM to mirror the data from the OnTap 8, 7-Mode system to the 7.3.3 system. The reason for this is QSM is replicating only files (a LUN in this case) whereas VSM replicates the entire volume including metadata.

E-

Re: replication between different versions of DOT

nsitps1976 — Fri, 27 Aug 2010 14:51:59 GMT

So you can create a SAN LUN used for VMware VMs within a qtree?

Re: replication between different versions of DOT

erick_moore — Fri, 27 Aug 2010 15:01:33 GMT

You absolutely can do that. If you already have LUNs presented to ESX/vSphere you can easily move those LUNs into qtree's on the fly, and then use QSM to replicate those to another system.

Re: replication between different versions of DOT

nsitps1976 — Fri, 27 Aug 2010 15:19:33 GMT

Ok, this is good news.

Are there any limitations / things I should be aware of if this route was taken? Does it complicate the process in any way?

Re: replication between different versions of DOT

erick_moore — Fri, 27 Aug 2010 15:47:55 GMT

No not really. All you need to do when building LUNs is create a qtree first, and then build your LUN in that qtree.