If Compellent provides each particular LUN merely through one controller, then how can they apply failover?

If Compellent provides each particular LUN merely through one controller, then how can they apply failover?

Dell Compellent is Dell’s leading space variety which competes shopping with this type of opponents as EMC VNX and NetApp FAS. Each one of these goods have somewhat various space architectures. Within this article i do want to go over what distinguishes Dell Compellent from aforementioned arrays when considering multipathing and failover. This might help you produce best choices when designing and setting up an answer predicated on Dell Compellent inside generation ecosystem.

In just one of my personal previous articles We confirmed just how Compellent LUNs on vSphere ESXi offers include claimed by VMW_SATP_DEFAULT_AA in the place of VMW_SATP_ALUA SATP, which is the default for all ALUA arrays. This happens because Compellent is certainly not really an ALUA range and doesn’t have the tpgs_on alternative enabled. Let us digress for a minute and talk about just what tpgs_on choice really is.

For a storage space selection to-be stated by VMW_SATP_ALUA it has to experience the tpgs_on alternative enabled, as showed from the matching SATP state guideline:

Compellent makes use of a notion of fault domain names and controls slots to control LUN failover between controllers

This is the way Target interface Groups (TPG) include described in part 5.8.2.1 Introduction to asymmetric reasonable device access of SCSI chief directions a€“ 3 (SPC-3) requirement: