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Azure Elastic SAN volumes can be simultaneously attached to multiple compute clients, allowing you to deploy or migrate cluster applications to Azure. You need to use a cluster manager to share an Elastic SAN volume, like Windows Server Failover Cluster (WSFC), or Pacemaker. The cluster manager handles cluster node communications and write locking. Elastic SAN doesn't natively offer a fully managed filesystem that can be accessed over SMB or NFS.
When used as a shared volume, elastic SAN volumes can be shared across availability zones or regions. Sharing a volume in a local-redundant storage SAN across zones reduces your performance due to increased latency between the volume and clients.
See Support for Azure Storage features for other limitations of Elastic SAN.
Elastic SAN shared volumes use SCSI-3 Persistent Reservations to allow initiators (clients) to control access to a shared elastic SAN volume. This protocol enables an initiator to reserve access to an elastic SAN volume, limit write (or read) access by other initiators, and persist the reservation on a volume beyond the lifetime of a session by default.
SCSI-3 PR has a pivotal role in maintaining data consistency and integrity within shared volumes in cluster scenarios. Compute nodes in a cluster can read or write to their attached elastic SAN volumes based on the reservation chosen by their cluster applications.
The following diagram illustrates a sample 2-node clustered database application that uses SCSI-3 PR to enable failover from one node to the other.
The flow is as follows:
The following diagram illustrates another common clustered workload consisting of multiple nodes reading data from an elastic SAN volume for running parallel processes, such as training of machine learning models.
The flow is as follows:
The following commands are supported with Elastic SAN volumes:
To interact with the volume, start with the appropriate persistent reservation action:
When using PR_RESERVE, PR_PREEMPT_RESERVATION, or PR_RELEASE_RESERVATION, provide one of the following persistent reservation type:
Persistent reservation type determines access to the volume from each node in the cluster.
Persistent Reservation Type | Reservation Holder | Registered | Others |
---|---|---|---|
NO RESERVATION | N/A | Read-Write | Read-Write |
WRITE EXCLUSIVE | Read-Write | Read-Only | Read-Only |
EXCLUSIVE ACCESS | Read-Write | No Access | No Access |
WRITE EXCLUSIVE - REGISTRANTS ONLY | Read-Write | Read-Write | Read-Only |
EXCLUSIVE ACCESS - REGISTRANTS ONLY | Read-Write | Read-Write | No Access |
WRITE EXCLUSIVE - ALL REGISTRANTS | Read-Write | Read-Write | Read-Only |
EXCLUSIVE ACCESS - ALL REGISTRANTS | Read-Write | Read-Write | No Access |
You also need to provide a persistent-reservation-key when using:
Begivenhed
31. mar., 23 - 2. apr., 23
Den største Fabric-, Power BI- og SQL-læringshændelse. 31. marts - 2. april. Brug koden FABINSIDER til at gemme $400.
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