HP 3PAR StoreServ 7400 2-node HP 3PAR Command Line Interface Administrator& - Page 163
Virtualization Software
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database of a particular group of users, enhances the performance stability for mail databases for other users and for other applications on the HP 3PAR StoreServ Storage systems. Microsoft Exchange is a highly interactive software, and its users demand a swift response to mouse clicks in the Outlook client. To prevent Microsoft Exchange from reporting errors, be careful to ensure that volumes receive enough IOPs and throughput so that the Microsoft Exchange server delivers sufficiently low I/O response times. Virtualization Software Virtualization platforms, such as VMware vSphere and Microsoft Hyper-V, make use of container files to store one or more virtual hard disk drives used by virtual machines. Each container file is built on one or more LUNs accessed over a SAN. Adding the LUNs that make up the container file to a VVset permits application of a QoS rule. This rule will control the IOPS and/or bandwidth for all virtual machines (VMs) whose virtual hard drives are carved out of that LUN. Be careful to ensure that there is enough bandwidth and IOPS in the QoS rule, so that the applications running on the VMs can deliver acceptable I/O response times. QoS I/O control operates on all VMs sharing a VMware datastore and, in some cases, this level of control may not be granular enough. Recent versions of VMware offer three native types of I/O resource control. Their characteristics, together with those of QoS, are listed in Table 16 (page 163). Table 16 VMware I/O Resource Control Control Mechanism HP 3PAR QoS VMware Storage DRS1 VMware SIOC2 VMware AQD3 I/O control technique: Limit IOPS and bandwidth Migrate VM to other datastore Control queue depth Control queue depth of datastore SAN LUN of datastore SAN LUN in VMkernel; VM in VMkernel shares enforced Reacts on: None I/O latency and space I/O latency utilization Queue Full or Device Busy at LUN or port level Granularity: All VMs in datastore Single VM VV All VMs in a single datastore All hosts using the SAN LUN for the datastore or a particular port on the 3PAR Managed from: HP 3PAR MC VMware vSphere VMware vSphere VMware vSphere Availability: 1, 2, 3 HP 3PAR OS 3.1.2 MU2 vSphere 5.0 and later vSphere 4.1 and later vSphere 3.5 U4 and with Enterprise Plus with Enterprise Plus later with Standard license license license 1 Distributes Resource Scheduler 2 Storage I/O Control 3 Adaptive Queue Depth HP 3PAR Priority Optimization QoS rules operate on volumes inside VVsets on an HP 3PAR StoreServ system. QoS rules are agnostic for the application type they manage. A QoS rule, on a VVset that contains one or more VVs that make up a datastore, controls the I/O across all VMs using that datastore. This could be suboptimal, however, as some VMs need more I/O resources than others. Combining QoS with SIOC offers I/O control up to the level of an individual VM-an I/O share and an optional IOPS limit defined per VM distribute the available I/O capacity in a fair way across VMs, ensuring that no single VM consumes all the I/O provided to the VVset through QoS settings. Note that SIOC will not respond to queue-full messages from QoS directly. HP 3PAR Priority Optimization can also cooperate with AQD to manage I/O. AQD handles I/O congestion in the I/O path to the datastore LUN. It does so by halving the queue length to the LUN Using HP 3PAR Priority Optimization 163