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 Post subject: Can you break apart existing remote copy groups?
PostPosted: Tue Dec 26, 2017 12:14 pm 

Joined: Thu Nov 30, 2017 11:20 am
Posts: 19
Location: WI
In an effort to break up my remote copy group of 4 VVs I would like to create 2 sets of 2. This will help in not having to wait for all 4 to finish before I can make changes, throttle speed, etc. Will I need to do a full resync or will it use whats already at the destination 3PAR?

My guess is it will reuse it but wanted to make sure before I did anything and forced a full resync.

Thanks all.


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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Thu Dec 28, 2017 7:35 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 561
I've never played with periodic sync (which seems to be your flavour), but you have a -keepsnap option on dismissrcopyvv which should ensure that you only need to resync changes and not the entire vv.


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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Fri Jan 12, 2018 4:13 am 

Joined: Fri Jan 12, 2018 1:11 am
Posts: 1
I've never played.The ability to move a virtual volume between remote copy groups without the need for a full synchronization was added. This is helpful in certain scenarios where you'd like to move the vv to another copy group without triggering a full synchronization.You have a keepsnap option on dismissr copyvv which should ensure that you only need to resync changes and not the entire vv.
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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Wed Jan 24, 2018 8:18 am 

Joined: Fri Jun 27, 2014 2:01 am
Posts: 382
As MammaGutt said, you must use "-keepsnap" option with the dismissrcopyvv.
Then it creates a virtual copy name sv.* for each dismissed vv.
Then create a new remote copy group, and use "admitrcopyvv vvname:virtualcopyname rcopygroup targetarray:targetvvname.


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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Wed Jan 24, 2018 8:43 am 

Joined: Thu May 28, 2015 3:45 am
Posts: 16
Retracted this comment because it's irrelevant.


Last edited by Jim Mc on Wed Jan 24, 2018 10:12 am, edited 2 times in total.

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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Wed Jan 24, 2018 9:54 am 

Joined: Thu Nov 30, 2017 11:20 am
Posts: 19
Location: WI
Thanks for all the input everyone. I did try and succeed at removing a member of a remote copy group and keeping the snap. I was able to re-add it and use the saved snap. It didnt fix the issue I hoped it would though which was the reserved copy space of the volume not going down after initial sync. Right now I have almost 13tb tied up on this volume that wont release. I think I need to contact HP as all attempts and different strategies have failed. I may just remove it from the RC group and have it do a full sync again. Not preferable but may be my only option.


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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Wed Jan 24, 2018 9:58 am 

Joined: Thu May 28, 2015 3:45 am
Posts: 16
If you delete all the unneeded snaps associated with the volume, you need to then wait 24 hours for the garbage collection to clear down the reserve copy space.

Once the reserve copy space is reduced it'll release the space back to the CPG level. If you then want to see the space released back to the PDs from the CPG you need to run a compactcpg.


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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Wed Jan 24, 2018 2:57 pm 

Joined: Thu Nov 30, 2017 11:20 am
Posts: 19
Location: WI
Jim Mc wrote:
If you delete all the unneeded snaps associated with the volume, you need to then wait 24 hours for the garbage collection to clear down the reserve copy space.

Once the reserve copy space is reduced it'll release the space back to the CPG level. If you then want to see the space released back to the PDs from the CPG you need to run a compactcpg.


Thanks for the tips. In a remote copy scenario how do I know which ones I need and which I dont?


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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Thu Jan 25, 2018 5:06 am 

Joined: Fri Jun 27, 2014 2:01 am
Posts: 382
If the used copy space of a volume is 0 then you can use "freespace -f <vvname>" to free the reserved copy space.

About the keepsnap option, once the vv is synced you will need to remove manually the sv.* victual copy.


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 Post subject: Re: Can you break apart existing remote copy groups?
PostPosted: Thu Jan 25, 2018 5:14 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 561
Since periodic replication always keep a snap active, freespace doesn't help.


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