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VMDKs are performing very good and I haven’t seen almost any difference between VMDK and RDM. Of course, you have to pay attention to the type of provisioning since Eager Zero vs Lazy Zero VMDKs performance differs a lot If you need some virtualized storage shared or mirrored between hosts you can use an ...


RDM lets the storage array do things like do array level snapshots of volumes. Maybe only useful for large databases, but it is still in use. Its a question of functionality, whether you use more storage features at the virtualization level or the array level.


There's no much point in using RDM these days unless your VM is sort of a "controller" VM and it uses ZFS or similar to aggregate multiple individual physical disks into single unified namespace. Think about Nutanix for example. For all other cases VMDK is just as well I/O performing as RDM but RDM-x doesn't support at least some nice features and has issues ...


What I read and what I understand suggest to me that in either case you're likely to end up with corruption unless you're using a cluster-aware file system such as CSVFS. I'm not a Synology user, but I do work with iSCSI and Failover Clusters. I would say that in your case, allowing multiple sessions will be the most appropriate option. Adding a new target ...

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