AoE & driver tips

sah_at_coraid.com
Date: 07/28/04

  • Next message: Scott Long: "Re: AoE & driver tips" 
    Date: Wed, 28 Jul 2004 14:33:58 -0400
To: undisclosed-recipients: ;

    Hello,

    I'm in the process of writing a AoE disk/protocol driver for freebsd.
    AoE (ATA over Ethernet) is used to access ATA devices attached directly to the Ethernet using the AoE registered Ethernet protocol type 0x88a2. I have already written a driver for linux 2.4 and 2.6 that makes AoE devices show up as local disks. I'm hoping to do the same for freebsd. I have some questions from my
    initial perusal of the code.

    I've been looking at the code in sys/dev/ata/ for tips on plugging into the disk device layer.
    It appears that what I want is disk_create && disk_destroy. How is the parameter "unit" related
    to device major & minor? I don't see anywhere where major and minor are related to the disk
    structure, though perhaps I'm just missing it. Do I need to register a device major?

    If a device fails or vanishes, can i just fail the outstanding bios and disk_destroy it?

    How does freebsd do SMART on ata? I'd like to be able to plug into this as well
    if the system uses it.

    Any other tips/comments about gluing together the disk & network would be appreciated.

    Cheers,

    Sam
    sah@coraid.com
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