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    SubjectRe: [PATCH 26/30] ext4: do not send discards as barriers
    On Tue 31-08-10 00:39:41, Vladislav Bolkhovitin wrote:
    > 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.
    Hmm, this might be an interesting option. Will try that. Thanks for
    suggestion.

    Honza
    --
    Jan Kara <jack@suse.cz>
    SUSE Labs, CR


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