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    SubjectRe: [RFC][PATCH 0/9] Network receive deadlock prevention for NBD
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    On Mon, 2006-08-14 at 09:13 +0400, Evgeniy Polyakov wrote:
    > On Sun, Aug 13, 2006 at 01:16:15PM -0700, Daniel Phillips (phillips@google.com) wrote:
    > > Indeed. The rest of the corner cases like netfilter, layered protocol and
    > > so on need to be handled, however they do not need to be handled right now
    > > in order to make remote storage on a lan work properly. The sane thing for
    > > the immediate future is to flag each socket as safe for remote block IO or
    > > not, then gradually widen the scope of what is safe. We need to set up an
    > > opt in strategy for network block IO that views such network subsystems as
    > > ipfilter as not safe by default, until somebody puts in the work to make
    > > them safe.
    >
    > Just for clarification - it will be completely impossible to login using
    > openssh or some other priveledge separation protocol to the machine due
    > to the nature of unix sockets. So you will be unable to manage your
    > storage system just because it is in OOM - it is not what is expected
    > from reliable system.
    >
    > > But really, if you expect to run reliable block IO to Zanzibar over an ssh
    > > tunnel through a firewall, then you might also consider taking up bungie
    > > jumping with the cord tied to your neck.
    >
    > Just pure openssh for control connection (admin should be able to
    > login).

    These periods of degenerated functionality should be short and
    infrequent albeit critical for machine recovery. Would you rather have a
    slower ssh login (the machine will recover) or drive/fly to Zanzibar to
    physically reboot the machine?

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