Messages in this thread | | | Date | Tue, 31 Aug 2010 00:39:41 +0400 | From | Vladislav Bolkhovitin <> | Subject | Re: [PATCH 26/30] ext4: do not send discards as barriers |
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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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