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    SubjectRe: [PATCH] ENBD for 2.5.64
    On Tue, Mar 25, 2003 at 09:40:44PM -0500, Jeff Garzik wrote:
    > Peter T. Breuer wrote:
    > >"Justin Cormack wrote:"
    > >>And I am intending to write an iscsi client sometime, but it got
    > >>delayed. The server stuff is already available from 3com.
    > >
    > >
    > >Possibly, but ENBD is designed to fail :-). And networks fail.
    > >What will your iscsi implementation do when somebody resets the
    > >router? All those issues are handled by ENBD. ENBD breaks off and
    > >reconnects automatically. It reacts right to removable media.
    >
    > Yeah, iSCSI handles all that and more. It's a behemoth of a
    > specification. (whether a particular implementation implements all that
    > stuff correctly is another matter...)

    Indeed, there are iSCSI implementations that do multipath and
    failover.

    Both iSCSI and ENBD currently have issues with pending writes during
    network outages. The current I/O layer fails to report failed writes
    to fsync and friends.

    > BTW, I'm a big enbd fan :) I like enbd for it's _simplicity_ compared
    > to iSCSI.

    Definitely. The iSCSI protocol is more powerful but _much_ more
    complex than ENBD. I've spent two years working on iSCSI but guess
    which I use at home..

    --
    Matt Mackall : http://www.selenic.com : of or relating to the moon
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