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Thursday, February 9, 2012
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Error 404--Not Found

Error 404--Not Found

From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:

10.4.5 404 Not Found

The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent.

If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.

SLM is not SLA

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The acronyms SLM (service-level management) and SLA (service-level agreement) are not synonymous. SLM, among accomplishing other goals, can help enterprise network managers automatically track how well service providers deliver on their SLAs. And SLAs, really just written contracts, serve as an insurance policy for companies getting Internet, network or application services from an external service provider or carrier.

Today IT departments are also learning the art of crafting internal SLAs for fellow departments, as more and more companies realize their IT organization provides valuable services that must be tracked as well. Creating the contracted agreements that are SLAs involves a lot of details, which include technical performance metrics as well as business objectives. Defining an SLA guarantee must be both relevant to business and achievable through the network infrastructure in place. Network executives must work with other departments to understand what they want to achieve and to communicate how the company's technology can deliver.

Once defined, tracking the performance of the network devices, systems, databases, Web and application servers against the pre-set thresholds poses another challenge. Many vendors attempt to address tracking external SLA performance to see if service providers deliver on their contracts. And management giants such as IBM Tivoli, Computer Associates, BMC and HP (and many others) also attempt to provide enterprise network managers SLM tools to also monitor internal network, application and SLA performance.

To read how network professionals sound off on the current SLM offerings and what needs to be in an ideal SLM package, check out this week's news story Wish list: What users want from SLM" and follow the links below:

Getting to the heart of SLM How to read an SLA
Taking the SLM plunge? Tell us what you think
Sifting through the SLM mess
Searching for SLM tools
Is QoS a prerequisite for SLM?
Real SLM means being proactive
The functions of SLM
Getting ready for SLAs

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