egee-ii infso-ri-031688 enabling grids for e-science end-to-end service level agreement...
DESCRIPTION
Enabling Grids for E-sciencE EGEE-II INFSO-RI TNC2007, May Introduction (1) Grid applications require specific level of QoS for data transfers across different Resource Centres (RCs) end-to-end (e2e) SLA is needed to define this level of QoS –provides the technical and administrative details to perform Maintenance Monitoring TroubleshootingTRANSCRIPT
EGEE-II INFSO-RI-031688
Enabling Grids for E-sciencE
www.eu-egee.org
End-to-End Service Level Agreement Provisioning and Monitoring
for End-to-End QoS
TNC2007, 21-24 May 2007
Vassiliki Pouli (GRNET/NTUA) [email protected]
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Enabling Grids for E-sciencE
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Outline
• Introduction
• SLA parts
• Model of SLA establishment
• Monitoring of SLAs
• Questions
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Introduction (1)
• Grid applications require specific level of QoS for data transfers across different Resource Centres (RCs)
• end-to-end (e2e) SLA is needed to define this level of QoS – provides the technical and administrative details to perform
Maintenance Monitoring Troubleshooting
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Introduction (2)
• Grid RCs: users of the network• Network providers
– GÉANT (paneuropean network)– NRENs (national networks)– Regional/metropolitan/campus networks
• Synthesis of e2e SLA based on individual domain SLAs
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SLA parts
• ALO (Administrative Level Object) – Contacts– Duration (start and end times)– Availability of service– Response times– Fault handling procedures
• SLO (Service Level Object) – Service flow description– Excess traffic treatment– Performance guarantees (OWD, jitter, packet loss, capacity…)– Reliability guarantees: max downtime (MDT), time to repair (TTR)– Monitoring infrastructure
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Trusted 3rd party - ENOC
• Multi-domain SLA• Need for a trusted 3rd party responsible for:
– SLA service installation– SLA management/monitoring– User support for network issues
network SLA violations
• For EGEE ►►► ENOC (EGEE Network Operation Centre)– Counterpart of a NREN NOC for EGEE– In charge of “EGEE network” operations
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Model of SLA establishment(1/2) Preliminary agreement
1. ENOC asks from every participating domain and RC to formulate an agreement
2. Each domain NOC provides– the ALO (Administrative Level Object)– max bandwidth allocated for EGEE
Each RC – provides administrative and technical
details – signs Acceptable Use Policy (AUP)
Provisioned network resources used only for EGEE purposes
3. ENOC stores the received information to the NOD (Network Operational Database)
Preliminary agreement
•Preliminary agreement of ENOC with participating domains & RCs• made once for every participating domain & RC
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Model of SLA establishment (2/2)2-Stage provisioning model: SR-SA
2-Stage Provisioning Model: SR-SA• Stage 1: Service Reservation (SR) – b2b SLA
– PIP (Premium IP) reservation in extended QoS network (GEANT/NRENs)– border-to-border SLA (GEANT/NRENs SLAs)
• Stage 2: Service Activation (SA) – e2e SLA– Activation of the service ↔ Configuration of the routers in the last mile
network– end-to-end SLA (b2b SLA + NREN client domains’ SLAs)
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Rationale of 2 stage provisioning model
• Grid applications require e2e path be available in time
• Lead time between service request and service reservation of the extended QoS network– Manual configuration of the routers – Currently 2 working days in the GEANT network
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Service Reservation – b2b SLA
• Case 1: automatic reservation– Reservation via AMPS servers of hosting NRENs and GEANT– AMPS (Advanced Multi-domain Provisioning System) :
System In development stage by the GEANT project Management of the whole PIP provisioning process from user
request through to the configuration of the appropriate network elements
• Case 2: manual reservation– No AMPS servers (or similar services) installed
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Stage 1: Service Reservation (SR)-b2b SLAcase 1: automatic reservation
• Reservation through AMPS or similar service
• ENOC identifies involved GEANT/NREN domains
• GEANT/NRENs provide individual SLAs
• Synthesis of b2b SLA: performed by ENOC based on reported GEANT/NRENs SLAs
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Stage 1: Service Reservation (SR)-b2b SLAcase 2: manual reservation
• Cases with no AMPS servers or similar services installed in NRENs
GEANT/
NRENs
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Stage 1: Service Reservation (SR)-b2b SLAcase 2: manual reservation
• No AMPS servers installed• ENOC identifies involved
GEANT/NREN domains• ENOC initiates manual requests
to individual domain NOCs• NOCs reply by email and provide
individual SLAs• Synthesis of b2b SLA: performed
by ENOC based on reported domain SLAs
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Stage 2: Service Activation (SA)-e2e SLA
• ENOC verifies that the reservation in the extended QoS domain is still effective and retrieves it
• Checks if NREN client domains (MAN/campus/institution) can support the request
• NREN client domains provide their SLAs
• ENOC produces e2e SLA based on:– reported NREN client domains’ SLAs – b2b SLA from stage 1
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Monitoring of SLAs• ENOC queries NPM DT (Network
Performance Monitoring Diagnostic Tool)
• NPM DT provides measurement data from perfSONAR (GEANT/NRENs) and e2emonit (RC-to-RC) monitoring frameworks
• Fault Identification/Notification – Case 1: ENOC identifies & notifies
responsible domain – Case 2: ENOC (not able to isolate
the problem) informs GEANT PERT (Performance Enhancement Response Team)
• Reaction-Repair according to SLAs• ENOC checks SLA compliance
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SLA monitoring requirements
e2e Metrics:– OWD (One Way Delay)– IPDV (IP Packet Delay Variation)– RTT (Round Trip Time)– Packet Loss– Available bandwidth– Achievable bandwidth– TTR (Time To Repair)
From trouble ticket issue to recovery, per violation
– MDT (Maximum DownTime)Maximum total TTRs for all violations in a given period
Performance metrics
Reliability metrics
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– Frequent e2e and partial domain monitoring of performance metrics (e.g. every 15’) in agreed service availability period
– Capability of setting thresholds on metrics to generate violation alarmsDifferent severity levels (?)
– Trouble tickets, triggered by users and ENOC operators on alarms, managed via TTM (Trouble Ticket Manager)
– Statistics from trouble tickets to infer MDT & TTR
Monitoring features
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Questions
?