This is already checked for LVM and ZFS setups, but not for Btrfs. Add
it there too, as it doesn't work anyway.

Tested by creating a block device with 4K sectorsize using
the following QEMU args:
  -device 
virtio-blk,drive=testdrive4k,logical_block_size=4096,physical_block_size=4096
  -drive file=/path/to/4k-testdisk.img,if=none,id=testdrive4k

The 4k-testdisk.img was created with:
  qemu-img create -f qcow2 /path/to/4k-testdisk.img 16G

Signed-off-by: Christoph Heiss <c.he...@proxmox.com>
---
 Proxmox/Install.pm | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Proxmox/Install.pm b/Proxmox/Install.pm
index 1c4811d..1117fc4 100644
--- a/Proxmox/Install.pm
+++ b/Proxmox/Install.pm
@@ -299,6 +299,10 @@ sub get_btrfs_raid_setup {
     my $diskcount = scalar(@$devlist);
     die "$filesys needs at least one device\n" if $diskcount < 1;
 
+    foreach my $hd (@$devlist) {
+       legacy_bios_4k_check(@$hd[4]);
+    }
+
     my $mode;
 
     if ($diskcount == 1) {
-- 
2.41.0



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