So, are expectations for SOA and Cloud computing over hyped?
A SLA is a legally binding contract that defines the relationship between the service provider and service consumer. As an individual cell phone user, you most likely have such an agreement with your mobile service provider, but, unfortunately, it favors them, not you. However, a business cannot afford to agree to such unfavorable terms, and thus, must enter into contract negotiations to ensure that the service provider delivers a minimum level of service or is penalized.
Thus, businesses are highly unlikely to enter into service consumer scenarios where there is no commitment to ensure availability of the service relative to demand. If demand is low and non-mission-critical, then a business may not bother at all with an SLA. If demand is high and/or mission-critical, the business will not move forward without a carefully negotiated SLA. (Of note, the cost to develop an SLA averages between $30,000 and $50,000.)
SOA and Cloud
Enter SOA and Cloud computing. SOA represents the archetype for delivery of everything as a service: software, hardware, telecommunications, call center, marketing, etc. If something can be compartmentalized with a formalized input and result, and can be measured, then it can be delivered as a service. Services working together to provide a more comprehensive offering is SOA. Cloud computing is the extension of this archetype for delivery of computing services, typically over the public Internet.
Ubiquitous availability of low-cost, high-speed Internet connections is a disruptive and driving factor toward the rise of an IT services-based economy. Prior to having widespread access to high-speed bandwidth via broadband, mobile and wireless connections, companies, typically, physically acquired software and hardware, installed and managed it locally. This put the onus of support on the business itself backed up by the vendor usually under peripheral support contracts. In some cases, where businesses had acquired capabilities as a service, it required expensive leased connections, tape-based data transfers and costly transaction fees.
With the rise of an affordable and commoditized approach to delivery of software and hardware as services available over a public, networked connection, businesses can now envision a future in which they can gain the advantages associated with an IT services-based economy―thus reducing the overhead to their own business without sacrificing capability. Yet, for this model to truly succeed it is going to have to address the needs of businesses with regard to service levels without incurring the overhead associated with SLAs. Moreover, as services become dependent on other services, the aggregation of multiple SLAs is going to further complicate this process.
While it seems plausible to create a one size fits all SLA, the realities of corporate performance, auditing and compliance with governance standards, such as Sarbanes-Oxley, are just some of the factors that impede the likelihood for the emergence of this type of agreement. Also, as noted above, Cloud computing is being developed in compounded layers, each with their own SLAs, thus restraining the ability for some Cloud vendors to even commit to some customer's SLA demands.