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@xxxxxxx> 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@xxxxxxx> SUSE Labs, CR -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
