DAS vs Shared SAS in IBM v3700

[IvicaVugrinec]

Hi,

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?

Thanks,

[rcporto]

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: