Abstract: Systems and methods for controlling and monitoring multiple fans in conjunction with a single fan controller are described. One such system includes the single fan controller, a plurality of fans, and a multi-fan monitor configured to receive a signal indicative of fan speed for each of the fans, (a) determine, for a selected fan of the fans, whether the respective received fan speed signal is within an expected fan speed range, if the respective received fan speed signal is not within the expected fan speed range transmit a signal to the single fan controller indicative of a fan failure, if the respective received fan speed signal is within the expected fan speed range transmit a signal to the single fan controller indicative of the fan speed for each of the fans, and return to (a) to test a next selected fan of the fans.

Abstract: Systems and methods ensure that datagrams retain integrity in light of the problems associated with the internetworking protocol's use of datagram identifiers drawn from a first pool of datagram identifiers. The methods involve controlling the use of datagram identifiers to ensure that only certain identifiers are allowable. A second pool of datagram identifiers is created that is different from the first pool. A datagram identifier is drawn from the second pool and assigned to a datagram in a manner that the datagram identifier is controlled from being reused during the lifetime of the datagram. In alternative embodiments the number of available datagram identifiers is either increased through optional header fields, or reduced through tracking allowed datagram identifiers. A first host notifies a second host of an allowed identifier. The second host uses the allowed identifier as a datagram identifier.

Abstract: Systems and methods for generating storage system commands are presented. Logical volumes comprise one or more storage areas. The methods include providing a map of the logical volume from information relating to the types of the storage areas composing the volume. Storage commands referencing the logical volume map are converted to storage area commands by command handlers associated with the type of the storage areas in the logical volume. The storage system comprises clients that access the storage areas by using a command stacks associated with the logical volumes.