We have two clusters in two sites and we want to have a volume on each cluster that is synced bidirectionally with RW access on each volume. Looking at other posts, it seems like this still isn't a "native" option using SnapMirror, SnapVault, or even SyncMirror and if we want to do that we need a 3rd party product like PeerSync, is that correct?
Yes that is correct. All snapmirror, vault,etc really on one volume being read/write the target volume being type data protection that keeps it from being written to unless the snapmirror relations is broken.
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