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0217c53b24
Unfortunatelly on kernels <4.16 lvm2 can't user brd ramdisks for backend device as number of test is failing with this kernel message: device-mapper: ioctl: can't change device type after initial table load. caused by DAX request-based handling, and lvm2 tries to replace device with backend 'error' bio-based device and such table reload is being rejected. So ATM keep ramdisk only on most recent kernel to experiment a bit, for older machines just stay safe and keep old slower loop backend.