![]() ![]() For example, database recovery often requires a retrieval of archived log files that are not currently online. HPE Nimble Storage has proven availability of 99.9999 across its installed base and we guarantee that for every customer, and every array. Say goodbye to unplanned downtime, performance compromises, and missed SLAs. The second goal is to provide access to offline data for recovery from a problem. Rely on proven 6-9s availabilityguaranteed. This process is repeated periodically for all online data on a time schedule. The first goal is to archive online data to offline media. In the SAN environment, backups have two goals. Having a proper backup strategy is one of the most important aspects of SAN management. You can use third-party management applications with your ESXi host. Depending on your storage needs, you might select storage with high performance and high availability, or storage with lower performance. When you are working on optimizing performance for your virtual machines, storage location is an important factor. You must plan how to set up storage for your ESXi systems before you format LUNs with VMFS datastores. Using a SAN with an ESXi host differs from a traditional SAN use in several ways.Īn ESXi host can access storage devices presented from multiple storage arrays, including arrays from different vendors. Specifics of Using SAN Storage with ESXi.When used with a SAN, ESXi can benefit from multiple vSphere features, including Storage vMotion, Distributed Resource Scheduler (DRS), High Availability, and so on. ![]() ![]() This ability allows you to migrate computing resources while maintaining consistent shared access. When virtual machines are located on SAN-based storage, you can quickly shut down a virtual machine on one server and power it up on another server, or suspend it on one server and resume operation on another server on the same network. The portability and encapsulation of VMware virtual machines complements the shared nature of this storage. You can then perform upgrades or other maintenance operations on the original host. If you use VMware DRS clusters, put an ESXi host into maintenance mode to have the system migrate all running virtual machines to other ESXi hosts.Because storage is on a shared SAN array, applications continue running seamlessly. Use VMware Distributed Resource Scheduler (DRS) to migrate virtual machines from one host to another for load balancing.Virtual machines continue to function without interruption on the secondary host if the primary one fails. Use VMware Fault Tolerance (FT) to replicate protected virtual machines on two different hosts.Use VMware High Availability (HA) in conjunction with a SAN to restart virtual machines in their last known state on a different server if their host fails.You can perform live migration of virtual machines using VMware vMotion.When you use SAN storage, all applications can instantly be restarted on another host after the failure of the original host. Using a SAN with ESXi systems extends failure resistance to the server.You can store data securely and configure multiple paths to your storage, eliminating a single point of failure.The following are benefits of using ESXi with a SAN: Using ESXi with a SAN also supports centralized management, failover, and load balancing technologies. It doesn’t appear to be a significant performance difference for SQL workload, but it would be something interesting to test.Using ESXi with a SAN improves flexibility, efficiency, and reliability. Because of this, most people prefer to still set it at ESX 5 policy. Down the road someone might storage vmotion some non-SQL workload onto that datastore, or just start using it for non-SQL workload. This can be a difficult thing to control. "If you are sure that only SQL data is going to be put onto a datastore, it’s best to use the SQL performance policy. They are a little torn as well and after some debate amongst themselves i received a reply like so: I sent an email to a nimble engineer requesting their opinion. I see where he is coming from and it makes sense but i still had a nagging feeling about the whole thing. My coworker says because its presented to esx and not presented directly to the server with iscsi software that we should be using the esx 5 performance policy and not the sql performance policy. I had it setup so that the sql server was on a sql lun with a sql server performance policy and the log drive was on a separate log lun using the sql log performance policy. A coworker and I are disagreeing upon which performance policy to setup for our SQL lun on our nimble san and I figured I'd turn to you guys and get your opinion. ![]()
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