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Created attachment 662253 [details]
Screenshot

Description of problem:
The limit for grub on rhel6 is 128 devices, but I'm not able to see/use all the devices.

Version-Release number of selected component (if applicable):
grub-0.97-77.el6.x86_64

How reproducible:
In my case always


Steps to Reproduce:
1. Start the grub command line on a system with more than 8 devices
2. Try to see the devices list with the 'root (' tab 
3. Try to force the installation on the 8th or 9th device
  
Actual results:
It fails with "selected disk does not exist"

Expected results:
Able to install grub on any devices till the 128Th

Additional info:

I've attached a screenshot of a virtual system.
This is the number of devices available on that system:

# fdisk -l | grep vd
Disk /dev/vda: 10.7 GB, 10737418240 bytes
Disk /dev/vdb: 2147 MB, 2147483648 bytes
Disk /dev/vdc: 12 MB, 12582912 bytes
Disk /dev/vdd: 12 MB, 12582912 bytes
Disk /dev/vde: 12 MB, 12582912 bytes
Disk /dev/vdf: 12 MB, 12582912 bytes
Disk /dev/vdg: 12 MB, 12582912 bytes
Disk /dev/vdh: 12 MB, 12582912 bytes
Disk /dev/vdi: 12 MB, 12582912 bytes
Disk /dev/vdj: 12 MB, 12582912 bytes
Disk /dev/vdk: 12 MB, 12582912 bytes
Disk /dev/vdl: 12 MB, 12582912 bytes

Grub can handle more than 8 disks, the problem is that it cannot handle more than 7 virtio disks.

All counters and limits are set ok - there is nowhere 8-device limit. When grub asks bios about version of LBA (check_int13_extensions) for 8th+ disk, it gets zero (no LBA support/error) and then it is not able to get disk info.

All disks are treated the same, so I suspect libvirt (or other component) to be responsible for this bug - i.e. not providing correct info for 8th+ virtio disks. 

I will switch this bug to libvirt for now.

Created attachment 663114 [details]
Screenshot - more than 8 disks

Libvirt doesn't have control over BIOS setup directly, so I suspect either QEMU or SeaBIOS is the place to look

Closing per comment 7.  The 7-disk limitation is in SeaBIOS.