Hi Douglas Thanks for writing. If I am understanding that governor correctly, that is for the number of concurrent moves? In this specific instance, I'm moving one volume of size 30+ TB, so I don't think it is entirely applicable for the situation. Definitely correct me if I'm wrong, though.
That being said, when the source aggregate is not under high load, I am able to get 400MB/s or higher in replication throughput which is pretty cool.
There IS a Snapmirror speed throttle that I would bump against occasionally, and that was addressed with a "setflag repl_throttle_enable 0" locally on each node while in diag mode. That really did make a difference in Snapmirror speed, enough of a difference that Jeffrey Steiner @ NetApp did some poking around internally to see why it's enabled in the first place. I don't recall the outcome of that poking.
Either way, I guess we'll find out what happens when there's a SFO while a volume move is happening?
________________________________________ From: Douglas Siggins siggins@gmail.com Sent: Wednesday, August 8, 2018 1:11:31 PM To: Ian Ehrenwald Cc: toasters@teaparty.net Subject: Re: volume move and SFO
Ian,
Just a suggestion (its been a while but I think this is how I removed the throttle in 9.1): volume move governor*> ? modify *Modify the governor configuration show *Display the governor configuration https://community.netapp.com/t5/Data-ONTAP-Discussions/How-many-vol-move-ope...https://protect-us.mimecast.com/s/_22xC1wpBwSpRxmOSLY-3g?domain=community.netapp.com
You should be able to move that data in a pretty rapid period of time. I've noticed when upgrading to 9.1 the throttle is definitely more visible -- even when removing the throttle there isn't a noticeable impact.
I would suggest against keeping the vol move running during the takeover, if its even possible.
On Wed, Aug 8, 2018 at 10:33 AM Ian Ehrenwald <Ian.Ehrenwald@hbgusa.commailto:Ian.Ehrenwald@hbgusa.com> wrote: Good morning I have a four node cluster, nodes1/2 are SAS/SATA and nodes 3/4 are AFF. I have a long running volume move going from node 1 to node 4. Long running, like 30TB+, and it's about 60% done. I need to do some hardware maintenance on nodes 1 and 2 tomorrow evening (install additional FlashCache cards). Will a takeover of node 2 by node 1, then a takeover of node 1 by node 2, interrupt this volume move? I can't seem to find much in the way of documentation about what happens during a SFO and a volume move, but it's possible I'm just not looking hard enough. Thanks for any insights.
Ian Ehrenwald Senior Infrastructure Engineer Hachette Book Group, Inc. 1.617.263.1948 / ian.ehrenwald@hbgusa.commailto:ian.ehrenwald@hbgusa.com
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