Milliseconds Warning
Static
>
Seconds
Seconds
Minor
==
Minutes
Minutes
Major
<>
Hours
Hours
Critical
Envelope
Days
Days
陈文革博士后
6
SLA Reports
Web Gold Report for 28 SLA calculations were performed over the period Oct 1, 1999 12:00:00 AM - Oct 7, 1999 11:59:59 PM.
Selected From Service Model
2 Threshold Spec
广东省电信科学技术研究院
Type Condition Boundary UnitofMeas GracePeriod GPUnitofMeas. Severity
Variable
<
100 Milliseconds
3
QOS是实现和保证SLA的一个环节。 比如网络畅通但是服务器拥塞！！！
IP网络统计复用、流量突发的特点导致SLA也只能以一 种统计的方法描述
平均，最大最小；
某一性能指标大于某一约定值得概率大于98%。 讲等级（Level)才有实际意义，才可以操作。
广东省电信科学技术研究院
陈文革博士后
旅行社 “八菜一汤” 四星级饭店 空调大巴
广东省电信科学技术研究院
陈文革博士后
fine print fine print fine print fine print fine print fine print fine print fine print fine print fine print
3
SLA的分类
Mon-Fri Weekends n/a
Operating Hours
8:00am - 5:00pm 6:00pm - 11:00pm n/a
Measurement 1 SLO San Diego Pop PVC Jitter
Threshold Spec. Threshold Spec.
TimeSpec. TimeSpec.
ISP的锐利武器和必由之路
广东省电信科学技术研究院 多媒体研究事业部
广东省电信科学技术研究院
陈文革博士后
1
内容提要
什么是SLA? 国内外SLA的发展动态 电信开展SLA应用的策略探讨 小结
广东省电信科学技术研究院
陈文革博士后
2
一、什么是SLA?
A Service Level Agreement is a contract between a provider and a customer that guarantees specific levels of performance and reliability at a certain cost
Carrier—backbone network provider Availability Round trip delay Packet loss ASP — Access services provider Dialup success rate Access rate Data Center----Hosting, EC, ASP service
- Monitoring and management of the key components that p the actual services - Provides an accurate view of actual service quality delivere viewed by the customer SLA报警和快速定位问题 - Provides preemptive warning of developing service problem - Enables rapid fault identification and isolation 提供SLA报告 - Performance graphs enable trend analysis for tracking asse 广东省电信科学技术u研t究ili院zation, future c陈ap文a革c博it士y后planning, real-time service8summ
provider Availability 广东省电信科S学e技r术v研ic究e院 response ti陈m文e革(博H士后TTP for customers) 4
SLA的特点
SLA是对客户最关心的服务质量的承诺，而如何实现和 保证服务质量不是SLA的范畴。
邮局送信的例子
10M/100M端口、机房条件等的承诺？？？ SLA与通常所说的QOS是有区别的 QOS一般针对网络而言，而SLA是用户感知的服务质量，
5
SLSALCAo的nf配ig置ura举tio例n
5 SLA
SLA Name
SLA Type Expression
SanDiego Pop PVC SLA Calendar Anniversary
SLO TimeSpec Compliance Percentage Contract Date
100பைடு நூலகம் 98% 80%
16 were found compliant, 9 were found non-compliant, and 3 were undetermined.
广东省电信科学技术研究院
陈文革博士后
7
SLA技术的主要内容
测量实际服务性能参数
- Measure and record actual service transaction times - Measure full paths spanning network and servers - Better reflects customer or user experience 监视服务等级协议的符合情况
4 Expressions
SD_Pop_Availability AND (SD_Pop_PVC_Jitter OR SD_Pop_PVC_SignalQuality)
3
Conformance Period
SLA Hour TimeSpec Day
Week
Month Year
Operating Days