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Maintenance iSCSI storage gateway servers
29-07-2020 00:00:00
- 29-07-2020 07:00:00
Urgency: planned
Affected services:
- iSCSI LUNs
- MSSQL instances
- MSSQL databases
- Websites on the loadbalanced shared Windows hosting platform
Expected Impact:
- iSCSI LUNs might not respond for a short moment
- MSSQL instances might not respond for a short moment
- MSSQL 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: 169449
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. MSSQL instances, MSSQL 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. During this maintenance, we will load a kernel module with modified parameters. These modified parameters ensure better scalability of the iSCSI platform. 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 expirience this as short stalls. Because we are using iSCSI storage as backend storage on our MSSQL clusters, customers with an MSSQL instance or a MSSQL database can experience a short stall to these services. The loadbalanced 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
- MSSQL instances
- MSSQL databases
- Websites on the loadbalanced shared Windows hosting platform
Expected Impact:
- iSCSI LUNs might not respond for a short moment
- MSSQL instances might not respond for a short moment
- MSSQL 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: 169449
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. MSSQL instances, MSSQL 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. During this maintenance, we will load a kernel module with modified parameters. These modified parameters ensure better scalability of the iSCSI platform. 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 expirience this as short stalls. Because we are using iSCSI storage as backend storage on our MSSQL clusters, customers with an MSSQL instance or a MSSQL database can experience a short stall to these services. The loadbalanced shared Windows hosting platform also uses iSCSI storage in its cluster. Websites on this platform can experience a short stall too.