Douglas McClendon wrote:


Theoretical Workaround #4
-------------------------

Understand the device mapper mirror target, which lacks
Documentation/device-mapper/mirror.txt

...

Theoretical Workaround #5
-------------------------

Use a linear device mapper device for the sysroot. Initially it will be composed of the /dev/md7 as par the patch, and a 1.5TB dm-zero device.
Then migrate the /dev/md7 from live-rw to /dev/sda1(partial).  Then free
live-rw components.  Then reload the tables so that the sysroot dm device
consists of /dev/md7(which is a single partial sda1 usage), + /dev/sda1(the rest of it) + dm-zero (up to 1.5T). Then resize2fs should work and everything is exactly right... Hmm... I'll have to try that tomorrow...

(this is because I just noticed someone say that you can play around with the dm tables of an active device. We'll see if I'm allowed to use /dev/sda(1) in two places at once (with or without possibly adding yet another layer of abstraction in there somewhere. And of course, hoping that the mdadm grow problem is just a bug that can be fixed, is still the first preference)


-dmc/jdog

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