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    SubjectRe: [PATCH] ENBD for 2.5.64
    On 2003-03-26T18:31:31,
    Lincoln Dale <ltd@cisco.com> said:

    > >Indeed, there are iSCSI implementations that do multipath and
    > >failover.
    > iSCSI is a transport.
    > logically, any "multipathing" and "failover" belongs in a layer above it --

    "Multipathing" on iSCSI is actually a layer below - network resiliency is
    handled by routing protocols, the switching fabric etc.

    > >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.
    > these are not "iSCSI" or "ENBD" issues. these are issues with VFS.

    Yes, and it is a fairly annoying issue... In particular with ENBD, a partial
    write could occur at the block device layer. Now try to report that upwards to
    the write() call. Good luck.


    Sincerely,
    Lars Marowsky-Brée <lmb@suse.de>

    --
    SuSE Labs - Research & Development, SuSE Linux AG

    "If anything can go wrong, it will." "Chance favors the prepared (mind)."
    -- Capt. Edward A. Murphy -- Louis Pasteur
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