Hi, I'm seeing an issue with the current design of our enclosure handling. In a system with a bunch of drives in an enclosure, it's definitely helpful to have a way to go from sdXX to which slot in the enclosure that drive is in, and that's what the symlink /sys/block/sdXX/device/enclosure_device:NN provides. However, in a system with multiple paths to the enclosure, eg an HBA with two external SAS ports, both connected to a SAS expander in a JBOD, ie in lame ASCII graphics, something like: +-----+ /-- drv1 | | +-----+ /--- . | |==SAS==| |-/---- . | HBA | | exp |------ . | |==SAS==| |-\---- . | | +-----+ \--- . +-----+ \-- drvN we have two paths to each drive, so each gets two names, sdXX and sdYY. However, in drivers/misc/enclosure.c, the code only allows one device in each component and so what happens is that sdXX gets discovered, then gets an enclosure_device:NN link, then sdYY is discovered, so sdXX's enclosure_device:NN link is removed and one is added for sdYY. And so if I want to figure out which enclosure slot sdXX is in, I'm in for a hard time. It would be a simple matter of writing code to allow all the block devices in a slot to link back to that slot -- we would have to be a bit more careful of keeping track of what links exist, but it should be doable. The wrinkle is that there are also /sys/class/enclosure/ZZZ/NN/device symlinks that allow going the other way. And it's harder to see how to express multiple block devices in one enclosure slot. Thoughts on how to improve our enclosure handling? Thanks! Roland -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html