Persistent reservation emulation in shared virtual storage environments

A non-transitory computer-readable storage medium that includes a set of instructions which, in response to execution by a processor of a first host, cause the processor to perform a method of persistent reservation emulation in a shared virtual storage environment that includes the first host supporting a first node and a second host supporting a second node, wherein the method comprises:

• detecting a command issued by the first node to update information relating to a reservation or registration associated with a virtual disk, wherein the virtual disk that is stored on a physical storage system and accessible by the first node and the second node;
• updating persistent reservation information associated with the virtual disk to indicate that the command has been issued by the first node, wherein the persistent information is accessible by the first host and the second host;
• determining that the second node either has acknowledged the updated persistent reservation information, or has not acknowledged the updated persistent reservation information within a time interval;
• and
• updating the persistent reservation information based on the command.

A first host, comprising:

• a processor;
• and
• a non-transitory computer-readable medium having stored thereon instructions that, when executed by the processor, cause the processor to perform the following in a shared virtual storage environment that includes the first host, and a second host:
• detect a command issued by a first node supported by the first host to update information relating to a reservation or registration associated with a virtual disk, wherein the virtual disk that is stored on a physical storage system and accessible by the first node and a second node supported by the second host;
• update persistent reservation information associated with the virtual disk to indicate that the command has been issued by the first node, wherein the persistent information is accessible by the first host and the second host;
• determine that the second node either has acknowledged the updated persistent reservation information, or has not acknowledged the updated persistent reservation information within a time interval;
• and
• update the persistent reservation information based on the command.