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Linux 2.6 kernel Storage Tuning Tips

Jan 19, 2009, 14:02 (0 Talkback[s])

"The Middle Layer’s purpose is to connect both Upper and Lower Layers and in our case is the scsi_mod.ko module. The Lower Layer is for the device drivers for the physical communication interfaces between the host’s SCSI Layer and end target device. Here is where we will find the device driver to the HBA.

"Linux SCSI SubsystemWhenever the Lower Layer detects a newer SCSI device, it will then provide scsi_mod.ko with the appropriate host, bus (channel), target and LUN IDs. Depending on what type of media the devices are would determine what Upper Layer driver will be invoked. If you view /proc/scsi/scsi you can see what each SCSI device’s type is:"

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