#Raid setup on virtualmachine full#

If you care about query performance, turn this setting off in the hardware BIOS. SQL Server will rarely push the processors that hard, which means they stay slow вЂ“ sounds good in theory, but in reality, every query takes 70-100% longer than it did pre-virtualization.

#Raid setup on virtualmachine full#

While IntelвЂ™s latest Xeon processors provide impressive power savings, they wonвЂ™t ramp up to full processor speed unless the CPU is under heavy load. Perhaps the users wonвЂ™t be querying old data, in which case you might be able to get by with less.ДҐ. If the projected database size is 50GB but the virtual server only has 16GB of memory, then itвЂ™s not going to be able to cache the entire database. If you canвЂ™t get the storage performance you need, you can help by caching as much of the database as possible in memory. Higher numbers than that may be required due to the application design or end user expectations, but thatвЂ™s a good foot-in-the-door number.Д¦.

Using a test file of the same size as the expected database, the storage should consistently exceed 100MB/sec whether itвЂ™s random or sequential, reads or writes. It just flat out hammers IO using whatever parameters you pass in. It has absolutely nothing to do with SQL Server вЂ“ it doesnвЂ™t require SQL Server, and it doesnвЂ™t mimic SQL Server. IвЂ™m partial to SQLIO, which might be the worst-named tool in history. Test storage performance before deployment. If youвЂ™re happy with the speed of SQL Server running on local storage, you can be in for a rude surprise with 1Gb iSCSI.Д§. While this cheap and easy-to-use storage works great for most servers, it doesnвЂ™t work as well for SQL Server. Everyone looks at their monitoring systems and canвЂ™t understand why the backups, big queries, and maintenance jobs run so slow, and the culprit is the hidden small uplink.ДЁ. All too frequently, the SQL Server is thrown into a blade chassis with dozens of other servers all competing for the same small amount of storage and network bandwidth leaving the blade chassis.

Virtualization works great with blades вЂ“ but only when the SAN and network teams monitor utilization rates between the blade chassis switches and the rest of the networks. When using blades, avoid overcommitting switch uplinks. You can read more about the vSphere CPU scheduler here.Д©. SQL Server will break queries out across multiple virtual CPUs, and it expects all of those vCPUs to perform identically. vSphere 4.1 introduced major improvements in multi-CPU scheduling that vastly improve performance. When a company is doing all of these things, odds are theyвЂ™re going to be very happy with their virtual SQL Servers:ДЎ0. The most successful deployments of virtual SQL Servers have a few things in common.