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Maintenance iSCSI storage gateway servers
08-04-2021 00:00:00
- 08-04-2021 07:00:00
Urgency: planned
Affected services:
- iSCSI LUNs
- MS SQL instances
- MS SQL databases
- Websites on the loadbalanced shared Windows hosting platform
Expected Impact:
- iSCSI LUNs might not respond for a short moment
- MS SQL instances might not respond for a short moment
- MS SQL databases might not respond for a short moment
- Websites on the loadbalanced shared Windows hosting platform might not respond for a short moment
Customer intervention required: no
Reference number: 173274
Summary:
During the maintenance we will restart the storage gateway servers that provide iSCSI storage. Before a server is restarted, switch-overs will take place of iSCSI targets between the gateways servers. During a switch-over, the iSCSI targets can be unavailable for several seconds, causing a short stall for iSCSI LUNs. MS SQL instances, MS SQL databases and websites on the shared Windows hosting platform are using iSCSI backend storage. These services could experience a short disruption due to these stalls.
Details:
Maintenance will take place on the storage gateway servers. The storage gateway servers will receive OS updates. The software version of the Ceph software will be upgraded to Octopus release version 15.2.10. Before a server restarts, the iSCSI targets on that server will be moved to a different server. During these switch-overs, the iSCSI target can be shortly unavailable to an iSCSI initiator. This could lead to a short IO stall on iSCSI LUNs until the target becomes available again. Customers with an iSCSI LUN can experience this as short stalls. Because we are using iSCSI storage as backend storage on our MS SQL clusters, customers with an MS SQL instance or an MS SQL database can experience a short stall to these services. The load balanced shared Windows hosting platform also uses iSCSI storage in its cluster. Websites on this platform can experience a short stall too.
Affected services:
- iSCSI LUNs
- MS SQL instances
- MS SQL databases
- Websites on the loadbalanced shared Windows hosting platform
Expected Impact:
- iSCSI LUNs might not respond for a short moment
- MS SQL instances might not respond for a short moment
- MS SQL databases might not respond for a short moment
- Websites on the loadbalanced shared Windows hosting platform might not respond for a short moment
Customer intervention required: no
Reference number: 173274
Summary:
During the maintenance we will restart the storage gateway servers that provide iSCSI storage. Before a server is restarted, switch-overs will take place of iSCSI targets between the gateways servers. During a switch-over, the iSCSI targets can be unavailable for several seconds, causing a short stall for iSCSI LUNs. MS SQL instances, MS SQL databases and websites on the shared Windows hosting platform are using iSCSI backend storage. These services could experience a short disruption due to these stalls.
Details:
Maintenance will take place on the storage gateway servers. The storage gateway servers will receive OS updates. The software version of the Ceph software will be upgraded to Octopus release version 15.2.10. Before a server restarts, the iSCSI targets on that server will be moved to a different server. During these switch-overs, the iSCSI target can be shortly unavailable to an iSCSI initiator. This could lead to a short IO stall on iSCSI LUNs until the target becomes available again. Customers with an iSCSI LUN can experience this as short stalls. Because we are using iSCSI storage as backend storage on our MS SQL clusters, customers with an MS SQL instance or an MS SQL database can experience a short stall to these services. The load balanced shared Windows hosting platform also uses iSCSI storage in its cluster. Websites on this platform can experience a short stall too.