A host device is configured to communicate over a network with a storage system. The host device comprises a multi-path input-output (MPIO) driver configured to control delivery of input-output (IO) operations from the host device to the storage system over selected ones of a plurality of paths through the network. The MPIO driver is further configured to identify a plurality of partitions of a storage device of the storage system, the storage device being used for booting a server. The MPIO driver is also configured to monitor an amount of consumed space of each partition, to transmit to the storage system data corresponding to the amount of consumed space of each partition, to process data from the storage system indicating that a size of the storage device has been increased, and to increase a size of one or more of the partitions.