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NOTE It is possible to provide 100% availability for a shorter duration, such as a day or a week
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However, Service Level Agreements are more concerned with availability over a period of time, and results of service delivery are reviewed at different levels on a monthly, quarterly, or yearly basis Although it s not quite uncommon to see some top-tier infrastructure providers such as ISPs, hosting companies, and power companies guaranteeing 100% availability, I have not worked in an IT department that guarantees 100% availability of messaging services without any caveats
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If 100% availability remains all but unachievable for most IT departments, what is achievable and respectable For instance, although 99% availability Sounds reasonable, it actually translates into 5256 minutes, or 87 hours, or 365 days of lost productivity! For most businesses this would be unacceptable Between 99% and 100% uptime lie the proverbial nines of availability, as illustrated in the following table:
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Downtime Availability % 99999% 9999% 999% 997% 99% Minutes 526 5256 52560 157680 5256 Hours 009 088 876 2628 (a little over 1 day) 8760
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As is evident from this table, the holy grail of 99999% availability, also known as five nines, affords you a little over five minutes of downtime every year Planning to apply that emergency hotfix that requires restarting the server Then consider yourself in violation of the SLA, depending on whether such maintenance is done within a planned outage window, and if such planned maintenance windows are defined in SLAs
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The other side of this high availability and SLA coin is cost It should come as no surprise that high availability comes with high costs attached to it costs for building adequate redundancy or fault tolerance into systems, networks, and the IT infrastructure, as well as costs for redundant power supplies in servers and network equipment, redundant CPUs, network interfaces, switches, routers, Internet connectivity from multiple providers, and so on Costs are directly proportional to availability, up to a certain point Beyond that, they rise exponentially (for instance, the costs of multiple redundant datacenters if site redundancy is required, electricity from different power grids to eliminate the utility company as a single point of failure, and the like) The cost of high availability becomes an important factor in deciding how far one can move the goalpost in terms of percentage of uptime
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Entire books have been written on high availability, redundancy, fault-tolerant computing, and Service Level Agreements, with a common theme the cost of downtime Vendors of high-availability hardware, software, and solutions often cite the cost of downtime in their marketing collateral For messaging, the cost of downtime due to a large number of users affected by an e-mail outage can be staggering The cost of a datacenter outage, or an entire organization without access to e-mail for an extended period of time, is even more so An outage may last for a few minutes, but its impact is felt by users for much longer and has a cascading effect on dependent business processes It is this cost of downtime that is used by most vendors to justify the cost of high availability Not too long ago, Zenprise commissioned the independent analyst firm Osterman Research to determine the cost of downtime for e-mail and that of troubleshooting the root causes of e-mail outages and fixing them Though focused on quantifying the cost of troubleshooting e-mail-related problems, which can be quite complex in larger organizations and involve multiple departments in addition to the Exchange/messaging team, the report provides an insight into the costs of e-mail outages as well According to the report, the downtime costs an organization of 5000 employees an average of $520,000 per year in lost productivity For larger organizations, the curve is much higher The complete report is available on the Zenprise website at http://wwwzenprisecom/resources/pdfs/ Zenprise-RP_Ostermanpdf This cost of downtime is not the same across different types of organizations For instance, in environments where e-mail is not very critical to operations and I am sure such businesses exist downtime may not be nearly as damaging Many small businesses may not be as concerned about downtime, and certainly do not incur the same type of costs should downtime inevitably occur Yet many other organizations may fully understand the implications and costs of downtime, but may have budgetary constraints that do not allow for elaborate high-availability implementations, or even any type of high availability at all
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