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    SubjectRe: [PATCH 26/30] ext4: do not send discards as barriers
    Jan Kara, on 08/31/2010 12:20 AM wrote:
    > On Mon 30-08-10 15:56:43, Jeff Moyer wrote:
    >> Jan Kara<jack@suse.cz> writes:
    >>
    >>> An update: I've set up an ext4 barrier testing in KVM - run fsstress,
    >>> kill KVM at some random moment and check that the filesystem is consistent
    >>> (kvm is run in cache=writeback mode to simulate disk cache). About 70 runs
    >>
    >> But doesn't your "disk cache" survive the "power cycle" of your guest?
    > Yes, you're right. Thinking about it now the test setup was wrong because
    > it didn't refuse writes to the VM's data partition after the moment I
    > killed KVM. Thanks for catching this. I will probably have to use the fault
    > injection on the host to disallow writing the device at a certain moment.
    > Or does somebody have a better option?

    Have you considered to setup a second box as an iSCSI target (e.g. with
    iSCSI-SCST)? With it killing the connectivity is just a matter of a
    single iptables command + a lot more options.

    Vlad


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