Pawel Jakub Dawidek <pjd_at_FreeBSD.org> writes: > Just to be clear. I fully agree with you guys. What I could do about > that when I was working on gmirror (starting from the simplest > solution): > > 1. Skip disks which have version lower then what we have in the kernel. > > 2. Upgrade the on-disk metadata automatically. > > 3. Make gmirror kernel module to work with all the previous versions and > add 'gmirror upgrade' command, so one can upgrade on-disk metadata. 4. Allow an older mirror to be accessed r/o by a newer kernel, side- stepping the issue of converting metadata back to the old format. Require an explicit 'gmirror upgrade' to upgrade the metadata and allow r/w access. IIRC, this is what ZFS does. I believe it would be a good compromise between 2 and 3. DES -- Dag-Erling Smørgrav - des_at_des.noReceived on Tue Jul 22 2008 - 10:44:44 UTC
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