Release Notes

Host based performance
9 Best Practices for Implementing VMware vSphere in a Dell PS Series Storage Environment | TR1091 | v1.3
9. Return to Configure > Storage > Storage Adapters > iSCSI Software Adapter > Adapter Details
> Targets and select Dynamic Discovery again.
10. Add the PS Series storage Discovery address, but do NOT rescan the adapter yet.
11. From the Dynamic Discovery listing, select the discovery address to modify and click Advanced.
12. Scroll down to Delayed ACK.
13. Deselect the checkbox for DelayedAck in the Inherited column.
14. Deselect the checkbox for DelayedAck in the Value column and click OK.
Do this for each discovery address that needs to be modified.
This is also a good time to verify that the Login Timeout is set to 60 and NOOP Timeout is set to 30.
15. Now you can rescan the Storage adapter(s) and verify that Delayed ACK is disabled, using the
command from Step 2.
3.2 Storage I/O control
Storage I/O Control (SIOC) is a means of ensuring that the excessive storage I/O demands of a particular
virtual machine disk (VMDK) do not negatively impact the storage I/O needs of other VMDKs residing on the
same datastore.
Because of the various load balancers in the PS Series storage, disable the SIOC feature on PS Series
storage based datastores. Otherwise, VMware vCenter might get false information and attempt to load
balance at the same time causing unnecessary data movement. For more information about SIOC, refer to
Dell PS Series Arrays: Advanced Storage Features in VMware vSphere.
Datastore details showing Storage I/O disabled and Hardware Acceleration supported in the
vSphere Web client