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Message-ID: <CAO_9QQcOSgUA84ewb=PANikU+MzeTmmeHnPeLd2SHQ_46sUi8Q@mail.gmail.com> Date: Mon, 9 Dec 2013 21:03:23 -0800 From: Jitesh Shah <jitesh.1337@...il.com> To: linux-ext4@...r.kernel.org Subject: Reproducible block structure Hello all, Assuming I have the latest ext4 system, I have a question -> Scenario -> I have 5 HDDs on which I burn the same block image on. These HDDs are usually mounted RO when used in production. For upgrading, I connect each one to an isolated machine, mount it as RW and run a script to update files (basically add, delete, modify files). Now, if the script is ran in the SAME way for all 5 HDDs, is it guaranteed that these HDDs will be same at the block level too? (i.e. block allocation/deallocation will follow the same pattern). Assume single-core system with only one process modifying the HDD in predetermined order. If there is no way to provide such a guarantee in a default ext4 install, is there an ext4 option (ordered?) which can provide this guarantee? Why do I ask -> I am tinkering with the idea of block level verification of images. If the above guarantees can be provided, I can easily hash the raw HDD for verification purposes. Thanks, Jitesh PS: I am not subscribed to the mailing list, so please include my id in the response if your email client does not put it there already! -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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