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As mentioned above, RAID0 mode will require interaction with the storage controller software to manage the addition and removal of drives. The main consideration when utilizing RAID0 mode for storage controllers within Virtual SAN is the impact on the operational model. When the storage controller cache cannot be completely disabled in a RAID0 configuration, it is recommended to configure the storage controller cache for 100% read-cache, effectively disabling the write-cache. When utilizing RAID0 mode, the storage controller cache should be disabled (this is configurable on some, but not all storage controllers) to ensure the storage controller cache does not conflict with the cache of the SSD drives which is controlled by Virtual SAN.
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Performance between pass-through and RAID0 mode for the same storage controller should be similar in most instances. Hot-plug will be managed by the storage controller software.Virtual SAN will not manage hot-plug capabilities of drives.When RAID0 mode is utilized, the the following occurs You will then have to mark which of these single drive RAID0 sets are SSDs within vSphere. RAID0 mode is utilized by creating a single drive RAID0 set via the storage controller software, and then presenting this to Virtual SAN. Regardless of the nomenclature, the end result gives Virtual SAN complete control of the local SSDs and HDDs attached to the storage controller.įor storage controller RAID adapters that do not support pass-through mode, Virtual SAN fully supports RAID0 mode. For storage controller HBAs, this is also known as Initiator Target mode (IT Mode), and for RAID controllers that support pass-through, this is known as JBOD mode. One of the big considerations when choosing a storage controller for Virtual SAN is whether it supports pass-through mode, RAID0 mode, or both.Ĭertain storage controller HBAs and RAID adapters can support a mode of operation commonly known as pass-through mode, where the vSphere hypervisor is given direct access to the underlying drives. Virtual SAN supports storage controllers in two modes, either pass-through or RAID0 mode. In this next installment, we will review storage controllers.
#Dell perc h200 configuration series#
The first post of this series covered solid state drive considerations. This is the second in a series of blog posts that will delve into hardware considerations that can be made when building a roll-your-own Virtual SAN environment.