Difference between revisions of "EGI Workload Manager Availability and Continuity Plan"
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Revision as of 13:05, 11 January 2019
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Back to main page: Services Availability Continuity Plans
Introduction
This page reports on the Availability and Continuity Plan for EGI Workload Manager - DIRAC4EGI and it is the result of the risks assessment conducted for this service: a series of risks and treats has been identified and analysed, along with the correspondent countermeasures currently in place. Whenever a countermeasure is not considered satisfactory for either avoiding or reducing the likelihood of the occurrence of a risk, or its impact, it is agreed with the service provider a new treatment for improving the availability and continuity of the service. The process is concluded with an availability and continuity test.
Last | Next | |
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Risks assessment | 2019-01-10 | 2020 Jan |
Av/Co plan and test |
Performances
The performances reports in terms of Availability and Reliability are produced by ARGO on an almost real time basis and they are also periodically collected into the Documentation Database.
In the OLA it was agreed the following performances targets, on a monthly basis:
- Availability: 99%
- Reliability 99%
Over the past years, DIRAC4EGI hadn't particular Av/Co issues highlighted by the performances that need to be further investigated.
Risks assessment and management
For more details, please look at the google spreadsheet. We will report here a summary of the assessment.
Risks analysis
Risk id | Risk description | Affected components | Established measures | Risk level | Expected duration of downtime / time for recovery | Comment |
---|---|---|---|---|---|---|
1 | Service unavailable / loss of data due to hardware failure | All the service components | Database protection with regular backups. Redundant Configuration database. Snapshots of virtual machines hosting DIRAC4EGI services | Medium | 1 working day after the hardware failure recovery | the measures already in place are considered satisfactory and risk level is acceptable |
2 | Service unavailable / loss of data due to software failure | All the service components | Backup of the MySQL and Configuration databases | Low | 1 working day | the measures already in place are considered satisfactory and risk level is acceptable |
3 | service unavailable / loss of data due to human error | All the service components | Backup of the MySQL and Configuration databases | Low | 1 working day | the measures already in place are considered satisfactory and risk level is acceptable |
4 | service unavailable for network failure (Network outage with causes external of the site) | All the service components | Geographically distributed redundant Configuration Service. Redundant failover Request Management Service. | Low | 1 hour after the network recovery | the measures already in place are considered satisfactory and risk level is acceptable |
5 | Unavailability of key technical and support staff (holidays period, sickness, ...) | Resources management. User support. Security infrastructure components | Automation of synchronization with BDII, VOMS, GocDB information indices. Automated resource monitoring service | Low | 1 or more working days | the measures already in place are considered satisfactory and risk level is acceptable |
6 | Major disruption in the data centre. Fire, flood or electric failure for example | All the service components | Backup of the MySQL and Configuration databases | Low | several weeks | the measures already in place are considered satisfactory and risk level is acceptable |
7 | Major security incident. The system is compromised by external attackers and needs to be reinstalled and restored. | All the service components | Backup of the MySQL and Configuration databases | Low | 1 or more working days | the measures already in place are considered satisfactory and risk level is acceptable |
8 | (D)DOS attack. The service is unavailable because of a coordinated DDOS. | All the service components | Limited service queries queues avoiding dangerous overloading of the service components. Automatic service restart after going down due to an overload. | Low | 1 hour | the measures already in place are considered satisfactory and risk level is acceptable |
Outcome
The level of all the identified risks is acceptable and the countermeasures already adopted are considered satisfactory
Availability and Continuity test
The proposed A/C test will focus on a recovery scenario: the service is supposed to have been disrupted and needs to be reinstalled from scratch. Typically this covers the risks 1,2, and 7. The last backup of the data will be used for restoring the service, verifying how much information will be lost, and the time spent will be measured.
Performing this test will be useful to spot any issue in the recovery procedures of the service.
Test details
Test outcome
Revision History
Version | Authors | Date | Comments |
---|---|---|---|
Alessandro Paolini | 2019-01-10 | first draft, discussing with the provider | |