Re: Moving a 4 node cluster in two pairs?
"John Stoffel" <[email protected]>
| Newsgroups | gmane.comp.hardware.netapp |
|---|---|
| Message-ID | <[email protected]> |
>>>>> "tmac" == tmac <[email protected]> writes: tmac> Another idea would be to use SVM-DR I don't think that will work for us... tmac> Setup a cluster peer. Then create the destination SVM and create tmac> a vserver peer between the source and destination. If you do tmac> not wish to mirror all volumes, I believe there is a per-volume tmac> option you can modify to prevent an unwanted snapmirror tmac> relationship in the SVM-DR. If the networking is the same tmac> between both locations, you can even allow the SVM-DR to copy tmac> the identity (LIFs, Addresses, etc) So I'd first have to move all the volumes onto one pair, split off the other pair, set it up as a standalone... the do the SVM-DR setup... swing things over. Hmm... tempting. Except a bunch of networking needs to change, and we can't run current networks in two seperate DCs. Blech. tmac> You could then "cut over" to the new location and use it. tmac> Make sense? tmac> --tmac tmac> Tim McCarthy, Principal Consultant tmac> Proud Member of the #NetAppATeam tmac> I Blog at TMACsRack tmac> On Wed, Mar 3, 2021 at 2:22 AM Sebastian P. Goetze <[email protected]> wrote: tmac> just to add to Heino: I had a student in one of my courses just lately, that moved his tmac> datacenter some 4-5 km with exactly this setup (4 cluster switches and good redundant tmac> connectivity) and some swing gear, if I remember correctly, because he didn't have enough tmac> capacity to completely evacuate a pair before the move. Completely non-disruptive, nobody tmac> noticed anything... tmac> Sebastian tmac> sent from my mobile, spellchecker might have messed up... tmac> On Tue, 2 Mar 2021, 19:36 Heino Walther <[email protected]> wrote: tmac> Hi John tmac> tmac> I’m not sure if this helps… tmac> I am also sure you can get the cluster running with half the nodes. tmac> I am actually migrating between two HA-pairs as we speak. tmac> We choose to setup a link between the nodes with two cluster switches, so the two HA-pairs tmac> is about 500M apart… (I’m not sure when latency becomes an issue) tmac> But what we did was to add the two new nodes (temporary nodes) to the existing cluster, tmac> and we are then able to use the “vol move” operation to move volumes from one HA-pair to tmac> another, and of cause also the LIFs. tmac> Works a charm so far. Huge NFS datastores have been moved with a hitch. tmac> We did a “vol move start” with the “-cutover-action wait” option, which does the mirroring tmac> but waits until we tell it to do the cut-over… (in a service window) tmac> There is however some “dedupe processes” which makes the cut-over very slow on larger tmac> volumes… it keeps telling us that it is waiting for a dedupe process to complete… (both tmac> systems are AFFs)…. But after 10-30 minutes it completes OK. tmac> tmac> Once we have emptied the source HA-nodes, we will move them to the new DC, and do it all tmac> over again back to the original system again… tmac> tmac> So far no down time at all, which is nice 😊 tmac> tmac> I realize that you may not be a lucky as to where you have to move the systems 😉 tmac> So drive safely, and if you are running spinning disks, be prepared to replace a few as tmac> you startup the system 😉 tmac> tmac> /Heino tmac> tmac> Fra: Toasters <[email protected]> på vegne af John Stoffel <[email protected]> tmac> Dato: tirsdag, 2. marts 2021 kl. 19.24 tmac> Til: [email protected] <[email protected]> tmac> Emne: Moving a 4 node cluster in two pairs? tmac> Guys, tmac> We're getting ready to move our 4 node FAS8060 cluster to a new data tmac> center. As part of our due diligence, we're thinking that we would tmac> snapmirror the most critical business volumes between the two pairs. tmac> The idea would be that if the truck holding pair A+B doesn't make it tmac> for some reason, we can still bring up the cluster with nodes C+D and tmac> still have those snapmirrored volumes available to continue working. tmac> So my questions are: tmac> 1. Can I boot a cluster with half the nodes missing? I'm sure I tmac> can... tmac> 2. Has anyone else had to do this half assed method of shipping DR? tmac> Cheers, tmac> John tmac> _______________________________________________ tmac> Toasters mailing list tmac> [email protected] tmac> https://www.teaparty.net/mailman/listinfo/toasters tmac> _______________________________________________ tmac> Toasters mailing list tmac> [email protected] tmac> https://www.teaparty.net/mailman/listinfo/toasters tmac> _______________________________________________ tmac> Toasters mailing list tmac> [email protected] tmac> https://www.teaparty.net/mailman/listinfo/toasters tmac> _______________________________________________ tmac> Toasters mailing list tmac> [email protected] tmac> https://www.teaparty.net/mailman/listinfo/toasters _______________________________________________ Toasters mailing list [email protected] https://www.teaparty.net/mailman/listinfo/toasters