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Description of problem:
HP Superdome X systems with BIOS 8.5.3 in UEFI mode may not be able to boot the recovery image, due to genisoimage's BZ 1547934.
When this happens, the following error message is seen when GRUB tries to load the initramfs:
Loading initial ramdisk ...
error: failure reading sector 0x85a90 from 'cd0'
The failing sector may vary.
Version-Release number of selected component (if applicable):
rear-2.00-4.el7_4.x86_64
Additional info:
The ReaR code creating the efiboot.img file assumes the image must be 32MB "aligned" (rear-2.00/usr/share/rear/output/ISO/Linux-i386/700_create_efibootimg.sh).
This is likely erroneous as we believe the efiboot.img cannot exceed 32MB!
Also, when setting the image size to 32MB as it is done currently (because there is almost no file to populate with), this leads genisoimage to generate a broken boot catalog entry which apparently can make the HP Superdome X BIOS fail to load the partition into memory, causing GRUB to then fail to read the initramfs for some reason.