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    SubjectRe: [RFC PATCH 35/35] Add Xen virtual block device driver.
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    Jeff Garzik wrote:
    >Arjan van de Ven wrote:
    >> On Fri, 2006-03-24 at 08:37 -0500, Jeff Garzik wrote:
    >>> Jeff Garzik wrote:
    >>>> In fact, SCSI should make a few things easier, because the notion of
    >>>> host+bus topology is already present, and notion of messaging is already
    >>>> present, so you don't have to recreate that in a Xen block device
    >>>> infrastructure.
    >>> Another benefit of SCSI: when an IBM hypervisor in the Linux kernel
    >>> switched to SCSI, that allowed them to replace several drivers (virt
    >>> disk, virt cdrom, virt floppy?) with a single virt-SCSI driver.
    >
    >> but there's a generic one for that: iSCSI
    >> so in theory you only need to provide a network driver then ;)
    >
    >Talk about lots of overhead :)
    >
    >OTOH, I bet that T10 is acting at high speed, right this second, to form
    >a committee, and multiple sub-committees, to standardize SCSI
    >transported over XenBus. SXP anyone? :)

    Actually SRP (which T10 has now stopped working on) fits the bill very
    nicely.

    I have to say that moving the IBM virtual drivers from a random
    collection of unique drivers (viodisk, viotape, viocd) to a single
    virtual SCSI HBA made life much easier.

    There is a group (actually, at least two groups) working on SCSI
    target infrastructures...once that is in place, I would expect we
    could start hacking a Xen virtual HBA.

    We looked at iSCSI as a transport (instead of SRP) but we felt that
    the added complexity made it unlikely that the average human could
    successfully boot their virtual machine

    Dave B
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