Hi Nayab, i am sure that kuber will tell you exactly how this can be done and gives you step-by-step instructions what to do. As he is an Expert and works at NetApp, he should be able to help you. Greetings
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Kuber, To be exactly, snapmirror initiates a snapshot of the source volume ( or qtree) and all data blocks referenced by this snapshot copy are transferred and written to the destination system. What I wanted to say in my previous answer is that snapmirror does not only transfer the reference pointers. So full data is copied over. TR3446 TR3326 page 9 "How snapmirror sync works" Okay, you are far more correct than I am. So continue asking about LUN type as this is really important for a snapmirror Cheers Best regards Hermann Mueller Senior Administrator Linux & Storage Puma SE Wuerzburger Str. 13 91074 Herzogenaurach Tel: +499132 812415 Fax: +499132 8142415 Cell: +49151 14743929
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Okay, I am not pointing fingers to anyone but bringing it back to the topic. Some of the things doesn't make sense to you ? Which things ? A snap mirror to another filer makes a snapshot ???? Ever observed the transfered data and time when initiated a snapmirror ? Or updated it? It fully copies over the data and not only a snapshot. What you say is not true. Indeed, what you say about the consistency is true. A snapmirror done on a lun with a database in access is not consistent and not really useable. So of course the lun must not be in access but only just before you do the last steps before breaking the mirror. Best thing would be, stopping the database and disable the host side port(s) on the fc switch, then quisece it (means actually last delta will be written where lun io is stopped) and then break the mirror. Don't forget to change the lun serial of the new lun. Create Igroup (iscsi or fc), map it and change the zoning fitting to the destination filer. If it is the cluster partner, it should be already zoned before. What you say about that you can't start a snapmirror while a lun is in access, yes you can and this usually done if you want to copy over a lun to another filer. Just think of a 15 TB LUN to copy over. Think about how long it takes and that's the way how this is done. As said above, only the last delta must be copied over after the application was shut down properly and the lun is not in access. 8 years of netapp experience proves that what I write. Greetings Best regards Hermann Mueller Senior Administrator Linux & Storage Puma SE Wuerzburger Str. 13 91074 Herzogenaurach Tel: +499132 812415 Fax: +499132 8142415 Cell: +49151 14743929
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Thats true... but i assume that Nayab is aware of this...He wrote "We have LUN a which....." So do you agree that if he already has a LUN that this might be already in use and an igroup was already created for this LUN and this igroup was already MAPPED ? I think he also ZONED it on the FC Switches 🙂 Otherwise this request would be senseless... unused LUN ...empty ...moving ??? doesnt make any sense...or do you disagree ? If it would be unsued, i would create a new Volume/LUN on the other Filer and delete the old one 🙂 So the point is that he has to snapmirror that (if he has the License to do so) and has to do the prerequisites as described in several tecnical documents. To be exactly , we have to ask if he has a Snapmirror Licence and if not, to ask if he could unmap the LUN so that this could stay in an unaccessed state fer a certain time (depends on the size) so he would have the option to use vol copy or ndmpcopy. Thats the think we have to ask....not if this is an iSCSI or FC LUN. 🙂
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Actually, does it really matter if this is an iSCSI or FC LUN ? and does it really matter which application is using that ? Snapmirror is volume based so this copies everything below a volume...doesnt matter if its files of a LUN ( which is actually a file in the Volume ) so more important would be giving more information how to do that, limitations and their workaraounds like no mirror from a 32 to a 64 bit aggregate. and the workarround is a qtree snapmirror.
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This is a FC LUN. correct...there is no difference. but as larger as the lun is, as longer takes the delta. the LUN is used for a Laptop Backup System. funny thing is, i managed it to mirror from a 32 to a 64 bit aggregate 🙂
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