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Hi Welcome Aboard,
You can create Hard disks as RDMs if you have a storage which is SAN based as NAS doesn't support RDMs and then you can use your desired file system. Although, I am a big fan of VMFS for few of the following reasons:
1. Its a Clustered file system.which provides simultaneous concurrent access to different hosts and VMs on the datastore.
2. It can be dynamically expanded even when VMs are running from that datastore
3. You can have a maximum size of a single datastore upto 64TB.
4. You can expand within the same LUN or add another extent and expand the datastore size.
5. VMFS-5 uses 1MB block size so you can store more data
6. It uses sub-block addressing.
Thanks for the reply
Wohoo, and with VMFS-5 you can even have LUN sizes of 64TB (which is good to put the disk as RAID together)
Only pass-through RDMs (Raw Device Mapping) can be created with a size >2TB. Non-pass-through RDMs and virtual disk files are still limited to 512B ~ 2TB.
There is no SAN, but nothing is set in stone yet. I would need ~4-6TB...
Could explain that:
You can expand within the same LUN or add another extent and expand the datastore size.
So it is possible to use storage devices only partially for a datastore and the rest for e.g. pure data? Would I need to do some pre-partitioning first?
Or was that for the SAN option only?
If you want to use RDMs, there is no boundation of SAN. You may very well achieve the same result with any software which can emulate the SAN behaviour. For example, you may use Openfiler software to do the same. Hope this helps.