What's the preferred way to differentiate BIOS fakeraid from regular
software mdraid?
I ask this as I'm booting with GRUB2 off a system that has one of those
Intel fakeraid chipsets. As of a few months ago, the mdadm package has
supported these fakeraid setups, so the RAID array comes up as a /dev/md###
device. This is unfortunate, as GRUB2 assumes that any device of the type
/dev/md### must be a pure software RAID device, and in
util/grub-setup.c:939, tries to install itself to the RAID members
individually:
if (0 && dest_dev[0] == 'm' && dest_dev[1] == 'd'
&& ((dest_dev[2] >= '0' && dest_dev[2] <= '9') || dest_dev[2] == '/'))
{
char **devicelist;
int i;
devicelist = grub_util_raid_getmembers (dest_dev);
for (i = 0; devicelist[i]; i++)
{
setup (arguments.dir ? : DEFAULT_DIRECTORY,
arguments.boot_file ? : DEFAULT_BOOT_FILE,
arguments.core_file ? : DEFAULT_CORE_FILE,
root_dev, grub_util_get_grub_dev (devicelist[i]), 1,
arguments.force, arguments.fs_probe);
}
}
For a fakeraid setup, however, the BIOS presents the entire device as
"regular" int13 device, so GRUB2 really should be installing it to the
entire /dev/md### device, not the individual members.
So what's the preferred way to differentiate BIOS fakeraid? Is there some
ioctl that would make this easier than having to parse /proc/mdstat?
Thanks,
-John Sheu
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