Thanks Sebastian,
That makes sense now. The GUI basically creates a relationship going the other way when doing a reverse resync, so obviously no command to specifically do that.
We are actually going to failover and failback so don't want to lose any data.
I do need to look at SVM-DR, but;
a. I've got existing Mirror-Vault relationships with a long retention for backup so not sure if those older snaps would be retained or not I convert to SVM-DR?
b. Is failing over just 1 volume possible?
KR, Chris. P.s. Apologies for the crazy long signature disclaimer!!
From: Sebastian Goetze spgoetze@gmail.com Sent: 25 October 2018 14:54 To: Chris Hague Chris_Hague@ajg.com Cc: Tim McCarthy tmacmd@gmail.com; jordan slingerland jordan.slingerland@gmail.com; Toasters toasters@teaparty.net Subject: Re: Reverse Resync - SnapMirror XDP relationship
Well Chris,
You'd do it just like you've set it up (if you did so using CLI), just the other way around. SnapMirror is a PULL-relationship, where you type it, there you (usually) pull data to (and might overwrite existing data).
Failover to DR:
DST::> snapmirror quiesce/abort/break
-> break makes the destination volumes writable... Let's assume, that you've worked on the destination and want to switch back...
Failback to original source:
(disconnect clients etc...)
SRC::> snapmirror resync -source-path DST://dr_svm/dr_vol -destination-path src_svm:src_vol
* You will lose data at the source now, if you also continued working there, while DR testing...! * If there's complaints, you might have to 'snapmirror delete' the original direction relationship * You can be specific and take a snapshot at the DST before resync and specify it using "-s <snap>" * You might keep working on the DR site, but then: disconnect clients and do a final 'snapmirror update' before doing the 'break' in the next step
When you're done: quiesce/break
Set up the original direction protection relationship from the DST::> cluster.
DST::> snapmirror resync -source-path SRC://src_svm:src_vol -destination-path DST://dr_svm/dr_vol
(again, you might have to delete the temporary reverse relationship...)
Remember:
* You can use wildcards in SnapMirror commands * Did you try SVM DR? Might make things a lot easier!
The "Data Protection Power Guide" also guides you through all these steps (some of them probably unnecessary, but the safer way to do things...)
Hope that helps
Sebastian
On 18/10/25 2:43 PM, Tim McCarthy wrote: He's asking about snapmirror with an xdp relation and then reversing it. Not refund.
I've done it before, if have to look up the commands but if I recall it was not too bad
-TMAC
Tim McCarthy...typos courtesy of Google Gboard!
________________________________ From: toasters-bounces@teaparty.netmailto:toasters-bounces@teaparty.net on behalf of jordan slingerland jordan.slingerland@gmail.commailto:jordan.slingerland@gmail.com Sent: Thursday, October 25, 2018 8:22 AM To: chris_hague@ajg.commailto:chris_hague@ajg.com Cc: Toasters Subject: Re: Reverse Resync - XDP
rsync has a lot of options so to reverse it does not provide a clear picture of exactly what you are trying to do. I am guessing simply swapping the source and destination is not what you are looking for?
also, since you say cifs, I do not believe rsync can maintain NTFS ACLS, at least years ago it could not. Consider using robocopy also as it does have operate via command line. I have used robocopy quite successfully to migrate large smb shares without a lot of clicking. I actually used bash to formulate all my robocopy commands and break them into .bat files for threaded or sequential transfers where it made sense based on share size and file count.
--Jordan
On Thu, Oct 25, 2018 at 7:26 AM Chris Hague <Chris_Hague@ajg.commailto:Chris_Hague@ajg.com> wrote: Anyone know if there is a way to reverse resync at the CLI?
All references to this talk about the GUI and in a DR test that's a lot of clicking for 100+ CIFS shares.
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