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    SubjectRe: [ANNOUNCE] [PATCHES] Advanced TCA Hotswap Support in Linux Kernel
    On Mon, Oct 14, 2002 at 11:42:15AM -0700, Steven Dake wrote:
    > lkml,
    >
    > http://www.sourceforge.net/project/showfiles.php?group_id=64580
    >
    > I am announcing a sourceforge project for developing support in Linux
    > kernel for Advanced TCA (PICMG 3.0) architecture. Advanced TCA is a
    > technology where boards exist in a chassis and can either be processor
    > nodes or storage nodes. All boards in the chassis are connected by
    > FibreChannel and Ethernet. The blades can be hot added or hot removed
    > while the Linux processor nodes are active, meaning, that the SCSI
    > subsystem must add devices on insertion request and remove devices on
    > ejection requests. Further the typical /dev/sda naming of devices is
    > not appropriate since device nodes can change depending on the insertion
    > order of disks.
    >
    > These patches are for Linux 2.4.19 and work with the Qlogic 2300
    > FibreChannel driver and at this point mostly support hotswap of the disk
    > subsystem.

    Some questions:
    - is there a public spec for this architecture?
    - are you going to be generating a 2.5 version of this so that
    this feature can be added to the main kernel tree?
    - Why don't you use the existing kernel way of notifying
    userspace of hotplug events, through /sbin/hotplug?
    - You create a lot of new ioctls, which is not nice. You should
    probably do what was done for the pci hotplug subsystem, and
    create a ram based filesystem for this subsystem. That way
    you don't need to have a /dev node, and the userspace tools
    become dirt simple.

    thanks,

    greg k-h
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