2015 年 9 月 15 日
Is your organization ready to do some capacity planning? If so, you will likely encounter some technical terms you've never heard before and aren't yet familiar with. Here is a list of some of the most common terms that the IT guys are likely to toss around that you need to understand.
|Building a 'model' will show you how the system works within a given set of parameters.|
A model, in relation to capacity planning, is a mathematical construction or formula that enables you to determine how a physical system works within a particular set of defined parameters. Usually, modeling makes use of a set of formulas that define the performance characteristics (like CPU utilization, transactional throughput, transaction capacity, etc.) Since server performance can change according to the type of transactions and number of transactions and produces, these kinds of formulas are extremely helpful in determining how SMS site servers and systems perform according to the design and configuration of the site
2. Server Sizing
Server sizing refers to the process of determining the correct types of hardware necessary to process a certain amount of data within a given period of time. Hardware to be included in server sizing considerations include CPU, memory, disk array, disk space, etc.
3. Service Request
A service request is a task or operation performed by the server. A service request refers to processes like reading a file, writing a file to storage on disk, or adding a newly created record to a database.
4. Query Length
The query length is the representation of the number of service requests which are waiting in line to be processed by the server at any given time. Usually, the smallest numbers (like one or two) indicate that service requests are being taken care of quickly and efficiently, meaning current capacity is not being stressed or maxed out. The larger the number, the worse current capacity is being handled by the system.
The SLA defines what you can expect from a service provider and what happens if either of you defaults on their promises.
5. SLA or Service Level Agreement
As you shop for the things you need to fulfill your long-term capacity needs, you'll likely come across the term SLA, or Service Level Agreement, when shopping for service such as cloud storage, DBaaS, etc. An SLA is the contract between your business and a service provider. The SLA defines what, exactly, is to be delivered, what it will cost, the 'uptime' promised, and what recourse you have if the provider fails to deliver as promised. The SLA also outlines what you are expected to pay for these services, when payments are due, and what happens in the event of non-payment.
6. Service Chain
The service chain refers to all of the hardware resources it takes to process a transaction or a service request. Service chain is also sometimes called the process flow. The total response time for a given service chain is equal to the sum of all of the response times for each service, resource, and transaction.
7. Load Signature
Load signature refers to the set of performance metrics of the server components on a particular computer hardware configuration. Load signature can be affected by one or more of several factors, such as the design of the hierarchy, the site configuration, features that are enabled, the frequency at which regular maintenance is performed, the software installed and running on the system, and the number of clients accessing the system. The load signature of every server is different and is assessed by measuring the usage of the components and their impact on any particular equipment or resources. This can be done once per day, once per week, once per month, etc., however it is appropriate in that particular architecture.
Never hesitate to ask someone to explain a term, or at least to spell it for you so that you can do additional research on your own. Though many of the terms are easy to understand, without the given context, it can be difficult or impossible to decipher the meaning. It's better to ask questions and learn the terms now than to discover that you were mistaken later. To learn even more about capacity planning for today's enterprise, visit NETSCOUT for information, resources, and more.