Что: 9f07e3bd2d670ebb82e7ac2858c2f058df475da7
Когда: 2021-04-02 14:20:15+03:00
Темы: fun zfs
Учёт лево-крутящихся дисков в Южном полушарии в ZFS
https://github.com/openzfs/zfs/pull/11823
Патч меридиональных дисков:
* Some minor math equations need to be solved. But it should help
protect data for our southern most users.
* This will future-proof ZFS against Earth's expected
magnetic-pole-reversal
* SMR disks untested
* Looking for testers at the extreme poles
* Using dst testing might violate GPL
Motivation and Context
ZFS needs to take into effect F = d/dt * (mv) and possibly
Eötvös effect.
How Has This Been Tested?
Extensive testing. To simulate southern hemisphere disk arrays
were held by the Testing&Integrity Team Members and "spun really
fast" in the opposite direction.
chrisrd commented Apr 1, 2021
Please make this configurable on a per-disk basis: we
specifically use right-spinning disks right now, but we'd like
to gradually replace them with left-spinners if possible as the
right-spinners use more power due to the negative coriolis
effect down here.
bghira commented Apr 1, 2021
the test failures are caused by not taking into account that the
disks can be mounted vertically. in the test failures, the disk
is told to move left but this is actually 'down' and the right
rotation should be mapped to 'up' and reverse this for mounting
in opposing direction.
adamdmoss commented Apr 1, 2021
FWIW I gave this a spin; didn't notice any difference in my
casual testing, but I should note that my disk array sits
precisely on the equator.
debdrup commented Apr 1, 2021
Please make this configurable on a per-disk basis: [...]
Another use for per-disk configuration is if you've got one disk
in Australia and another in Denmark.
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