XL.jpg' alt='Asterisk Provisioning Tool' title='Asterisk Provisioning Tool' />SQL Server Hardware Configuration Best Practices. New Whitepaper 1. Ways We Can Steal Your Data download now. Problem. You have been asked to deploy a brand new SQL Server instance. Your management asks you to come up with the best balance of availability, performance and cost for SQL Server. What do you recommend Solution. Im going to try to describe my recommendations for hardware and server configuration best practices. However, let me just say that best practices are somewhat of a sticky issue. Almost everybody has an opinion just like almost everybody has a nose. I am hoping that this article will generate a good deal of helpful discussion. I really hope community members keep it to a helpful discussion however. High Availability. The whole point of High Availability HA is to have your service available to respond to requests, to have your database available and not have consistency issues. There are four main ways to provide HA power, redundant hardware, clustering and multiple copies of your database. Power. Your server at a minimum should have dual power supplies connected to a UPS. For extra protection, it is good to have separate power feeds as well. Redundant Hardware. As listed above, you should have dual power supplies, and for disks, some form of RAID that provides redundancy. Jeremy Kadlec describes the different types of RAID in his article Hardware 1. SQL Server DBAs.   In general, RAID 1, 5, 6, 1. You should always configure hot spares when using RAID with redundancy. That way, you have to have at least two failures before you actually go down. Asterisk Provisioning Tool' title='Asterisk Provisioning Tool' />Hi, I was looking round on the Internet and saw there was no definitive list of free applications available for use with Asterisk, so I thought Id compile a list for. Preparing for a Deployment of JD Edwards EnterpriseOne Release 9. Using OneClick Provisioning on Oracle Cloud Infrastructure Compute. This is a book for anyone who uses Asterisk. Asterisk is an open source, converged telephony platform, which is designed primarily to run on Linux. VMware is the global leader in virtualization software, providing desktop and server virtualization products for virtual infrastructure solutions. In an effort to improve our ability to service our customers, Spectralink has implemented changes to the support portal website. We now require that you create an. Cisco Security Advisory Multiple Vulnerabilities in Apache Struts 2 Affecting Cisco Products September 2017. No more missed important software updates UpdateStar 11 lets you stay up to date and secure with the software on your computer. Its not exactly redundant hardware, but backups should always be on another device, like a file server. That way if your SQL Server completely melts into the ground, your backups are safe elsewhere. Clustering. Clustering typically refers to combining two or more servers together to allow them to either share workload, or takeover workload quickly in the event of a failure. When it comes to SQL Server, there are two types of clustering we are interested in. Windows Server Cluster is the combination of two or more Windows Servers into a cluster. SQL Failover Cluster Instance FCI is an instance of SQL Server that can run on the nodes of a Windows Server Cluster. So I should point out here that it is possible to create a Windows Server Cluster that only has one node. Why you might ask would you want to do that  There are a couple of reasons If you start out with a one node Windows Server cluster and install an FCI, you can add more nodes later and then install a SQL FCI on them as well. If you start out with a stand alone Windows Server and install a stand alone SQL Instance you cannot convert them into a cluster later. A SQL FCI has a virtual computer object associated with it, which means if you use a non default instance name, you can use the virtual computer object name to refer to the instance instead of the format Instance. Name. The way you configure the quorum for your cluster is critical. There are way too many factors to consider for me to explain all of them here. The way you configure your quorum determines how many layers of failure are necessary before the cluster fails. Please see this article for more information Understanding Quorum Configurations in a Failover Cluster. Multiple Copies of Database. Another way to provide HA is to have multiple copies of your database available that can be switched to if needed. Copies of databases are usually described as some sort of standby hot, warm, cold. Each has its features as described below Hot Standby Hot standby means a copy of the database is available immediately with no intervention from a DBA. Hot standby usually uses something like Peer to Peer replication to keep more than one copy of the database available for immediate use. Hot standby will require the client to be smart enough to reconnect to the other database if the original fails. Theoretically only current transactions would be lost if you have to failover to a hot standby database. Warm Standby Warm standby means a copy of the database is available quickly with little intervention from a DBA. Mirroring is a good example of a warm standby database. It is easy to switch from the primary to the mirror, and can even be accomplished automatically if a witness server is used. Client connections are often smart enough to reconnect if the primary fails over to the mirror. Crossfire 3 Sylvia Day Pdf. Antivirus Elistara Descargar. With mirroring there are two modes of operation, synchronous, and asynchronous. In synchronous mode, only current transactions would be lost. In asynchronous mode, only transactions since the last update was applied would be lost. Typically this would be only a few seconds at the most. Cold Standby Cold standby means there is a copy of the database that can be made available, but it may take some work, and it is not likely to be easy to switch the roles of the databases. Log shipping is an example of making a cold standby copy of a database. In cold standby mode with log shipping, several minutes of transactions might be lost in a failover. Microsoft has changed mirroring starting with SQL Server 2. They are deprecating mirroring and they are replacing it with Always. On Availability Groups. Dreamweaver 8 Free Download For Windows 8 64 Bit on this page. There are several differences, but a couple really stand out for this discussion. First, you are now able to have a secondary database that is read only. Before the mirror was always offline in a restoring mode, so now the secondary mirror is able to be used for reporting or other read only uses. Another interesting feature is that as the name implies databases can be grouped together into Availability Groups. Now you can fail over a group of databases instead of only one at a time. Performance. When it comes to performance, the main factors include hardware bottlenecks, database design and application design server processing vs. In this tip, I am only going to speak to hardware bottlenecks. Might look into database design and application design later. The primary types of bottlenecks are disk IO, memory, CPU and network IO. Disk IODisk IO speed is critical to performance. There are three places that disk IO can impact performance Data Files, Log Files and Temp. DB files.   To a lesser degree, the Windows swap file can sometimes impact performance. For the data files, expect random IO, for log files, it will pretty much always be sequential IO, and Temp. DB is the same for its data and log files. Different types of RAID work better with sequential IO than with random IO. If I can afford it, I try to use at least four disks in a RAID 1. RAID 1 configuration for a log volume. I sometimes use RAID 5 when performance isnt as much an issue, because you get more capacity and still have one layer of redundancy. See Hard Drive Configurations for SQL Server for more information on choosing a RAID type. It is best to separate the following loads into different volumes backups, logs, data and Temp. DB.   While I am on the subject DO NOT partition a disk or RAID volume into multiple drives. This will force disk head thrashing which is BAD. Also pay attention to the allocation unit size when formatting the volumes. In general I have found that 6.