A system comprising: a rack (100, 200, 300) for housing storage devices, the rack (100, 200, 300) having an airflow source providing an airflow (108, 208, 308) to the storage devices for cooling; a first row (102, 202, 302) of storage devices installed in the rack (100, 200, 300), the first row (102, 202, 302) having a first group of storage devices arranged in the rack (100, 200, 300) and comprising adjustable mounts for mounting the first group of storage devices, wherein any two consecutive storage devices in the first row (102, 202, 302) have a first gap distance between the any two consecutive storage devices in the first row (102, 202, 302) and the adjustable mounts are configured to be moved to adjust the first gap distance between the any two consecutive storage devices in the first row (102, 202, 302); and a second row (104, 204, 304) of storage devices installed in the rack (100, 200, 300), the second row (104, 204, 304) having a second group of storage devices arranged in the rack (100, 200, 300), wherein the second row (104, 204, 304) of storage devices is located farther away from the airflow source than the first row (102, 202, 302) of storage devices within the rack (100, 200, 300), means configured to monitor a temperature associated with the second group of storage devices, wherein the second row (104, 204, 304) comprises a larger number of storage devices than the first row (102, 202, 302), wherein any two consecutive storage devices in the second row (104, 204, 304) have a second gap distance between the any two consecutive storage devices in the second row (104, 204, 304), the second gap distance being narrower than the first gap distance, wherein the airflow source is configured to direct the airflow (108, 208, 308) to flow through gaps between the first row (102, 202, 302) of storage devices and then through gaps between the second row (104, 204, 304) of storage devices. a rack (100, 200, 300) for housing storage devices, the rack (100, 200, 300) having an airflow source providing an airflow (108, 208, 308) to the storage devices for cooling; a first row (102, 202, 302) of storage devices installed in the rack (100, 200, 300), the first row (102, 202, 302) having a first group of storage devices arranged in the rack (100, 200, 300) and comprising adjustable mounts for mounting the first group of storage devices, wherein any two consecutive storage devices in the first row (102, 202, 302) have a first gap distance between the any two consecutive storage devices in the first row (102, 202, 302) and the adjustable mounts are configured to be moved to adjust the first gap distance between the any two consecutive storage devices in the first row (102, 202, 302); and a second row (104, 204, 304) of storage devices installed in the rack (100, 200, 300), the second row (104, 204, 304) having a second group of storage devices arranged in the rack (100, 200, 300), wherein the second row (104, 204, 304) of storage devices is located farther away from the airflow source than the first row (102, 202, 302) of storage devices within the rack (100, 200, 300), means configured to monitor a temperature associated with the second group of storage devices, wherein the second row (104, 204, 304) comprises a larger number of storage devices than the first row (102, 202, 302), wherein any two consecutive storage devices in the second row (104, 204, 304) have a second gap distance between the any two consecutive storage devices in the second row (104, 204, 304), the second gap distance being narrower than the first gap distance, wherein the airflow source is configured to direct the airflow (108, 208, 308) to flow through gaps between the first row (102, 202, 302) of storage devices and then through gaps between the second row (104, 204, 304) of storage devices.