DAS vs Shared SAS in IBM v3700


Can someone please clarify the difference between DAS as in Direct Attached Storage and SAS as in Serial Attached SCSI it the context of host attachment?

We have a IBM® Storwize® V3700 that offers Serial-attached SCSI (SAS) host connections.

Are those shared storage options? Can i attach 3 hosts via Serial-attached SCSI (SAS) host connections and utilize VMware HA and vMotion technologies?

Or are those Serial-attached SCSI (SAS) host connections really Direct Attached Storage options and are NOT shared storage options in vmware world?

Can please someone explain? Can someone please confirm that Serial-attached SCSI (SAS) host connections on IBM v3700 are shared storage options that can be used for vmware HA and vMotion?


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The IBM Storwize V3700 support host attachment using iSCSI, FC and SAS. Note that the term "direct attach" in this case is just about the fact you're noting using a switch between your host and storage, this mean that you're connecting your SAS HBA directly on SAS port of your V3700.

And this is a valid and supported configuration, you can see the HCL here: VMware Compatibility Guide - Storage/SAN Search

The following image shows hot to connect 3 hosts to your V3700:



Richardson Porto
Senior Infrastructure Specialist
LinkedIn: http://linkedin.com/in/richardsonporto
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