The Deswizzling on the destination is just the process of putting in the physical Volume Block Numbers into the destination Volume Block map. They, of course, get 'lost' during the block based VSM transmission, since the volume allocation on the sending aggregate and the receiving aggregate will always be different (as opposed to SyncMirror...).
If the destination aggr is fairly empty, the destination volume will be aligned/allocated just fine. No need for reallocate on the destination.
Sebastian
On 10/23/2013 3:46 PM, Jordan Slingerland wrote:
I believe if you ran reallocation on any preexisting volumes on the snapmirror destination that will allow snapmirror to more optimally layout the stripes when you snapmirror the data over.
But, if you are snapmirroring a fragmented volume to a new empty aggregate, my understanding is that will with hit the other side mostly optimized as far as free space.
Reallocation can get a little hazy ...so happy to hear any comments or corrections from others.
-----Original Message----- From: toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of Martin Sent: Wednesday, October 23, 2013 9:11 AM To: toasters@teaparty.net Subject: Deswizzling and Reallocate
I've recently destroyed one aggregate and merged the spared disks it into another aggregate on the same Filer. I now need to snapmirror the volumes out of this aggregate into another on another Filer (musical volumes!).
I didn't run a volume reallocation on the volumes after I added the disks from the recently destroyed aggregate as I'm going to be snapmirroring the data out of it.
I'm not clear on whether I will need to run a volume level reallocate on the volumes once they are in the new aggregate? Will the deswizzle post snapmirror on the destination aggregate optimise the layout on the aggregate?
I did a Google for "reallocate deswizzle" and looked on the NOW site but didn't find many hits and none were relevant.
I can run a reallocate measure once the volumes are on the new Filer and aggregate but wonder how the volume reallocate and deswizzling are related.
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