Dell VNX5800 VNX Series: Introduction to SMB 3.0 Support - Page 8

Server Continuous Availability, Using the persistent handle

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Figure 3 Server Continuous Availability Figure 3 shows the sequence of events for a Data Mover failover with CA enabled: 1. The client requests a persistent handle by opening a file with associated leases and locks on a CIFS share. 2. The CIFS server saves the open state and persistent handle on disk. 3. The primary Data Mover is failed over to the standby Data Mover. 4. The Data Mover reads and restores the persistent open state from the disk before starting the CIFS service. 5. Using the persistent handle, the client re-establishes the connection to the same CIFS server and recovers the same context associated with the open file as before the failover occurred. CA enables SMB clients to transparently reconnect to the peer Data Mover without affecting clients accessing files on the shares. EMC VNX Series: Introduction to SMB 3.0 Support 8

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EMC VNX Series: Introduction to SMB 3.0 Support
Figure 3
Server Continuous Availability
Figure 3 shows the sequence of events for a Data Mover failover with CA enabled:
1.
The client requests a persistent handle by opening a file with associated
leases and locks on a CIFS share.
2.
The CIFS server saves the open state and persistent handle on disk.
3.
The primary Data Mover is failed over to the standby Data Mover.
4.
The Data Mover reads and restores the persistent open state from the disk
before starting the CIFS service.
5.
Using the persistent handle, the client re-establishes the connection to the
same CIFS server and recovers the same context associated with the open file
as before the failover occurred.
CA enables SMB clients to transparently reconnect to the peer Data Mover without
affecting clients accessing files on the shares.