Abstract: A computer program product and corresponding computer-implemented method cause the performance of various operations to upgrade a network storage device having first and second storage controllers operating in an active-passive mode and disk media shared by the storage controllers. The first storage controller operating as a passive storage controller is caused to enter a new IQN for each virtual disk into a first iSCSI target configuration file and maintain a corresponding old IQN. The first storage controller is then caused to begin operating as the active storage controller so that the second storage controller, while operating as the passive storage controller, is caused to enter the new IQN for each virtual disk into a second iSCSI target configuration file and maintain the corresponding old IQN. Accordingly, the first and second iSCSI target configuration files map both the old and new IQNs to the virtual disks.

Abstract: A computer program product and a data storage device including first and second storage controllers operating in active-passive mode with a shared disk. Each storage controller includes a storage device storing program instructions and a processor to process the program instructions and perform various operations. The operations include receiving a task to be performed by the storage device containing the first and second storage controllers, wherein the first storage controller is currently operating as an active storage controller and the second storage controller is currently operating as a passive storage controller. The operations further include determining whether the received task has a high priority or a low priority, performing the received task in response to determining that the received task has a high priority, and delegating the received task to the second storage controller for performance in response to determining that the received task has a low priority.

Abstract: An upgrade procedure may be executed at a network device to allow the network device to automatically upgrade an operating system to a new operating system. The upgrade procedure may include receiving a bootable image file of an upgrade operating system that is different from an operating system being run by the network device and which uses a file system format that is different from the file system format of the operating system being run by the network device. The bootable image file includes a binary file format that conforms to the file system format used by the upgrade operating system. The network device allocates contiguous space on a drive of the network device and copies the bootable image file to the contiguous space. The network device also modifies a master boot record of the drive such that the contiguous space on the drive is reflected in the master boot record as a bootable partition of the drive.