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Created attachment 546845 [details] lspci from one of the effected nodes Description of problem: In my test system, I have a single SATA platter drive. When I modify the disk using 'fdisk -u /dev/sda', it alerts that "DOS-compatible mode is deprecated". I press 'c' to disable this, 'w' write out the changes and reboot. Once rebooted, I try to again configure the disk and get the same message. Version-Release number of selected component (if applicable): util-linux-ng-2.17.2-12.4.el6.x86_64 How reproducible: For me, 100% across two nodes. Unknown if it's hardware-specific. Steps to Reproduce: 1. Use fdisk to disable DOS compatible mode. 2. Write out the changes and reboot. 3. Again open the disk using fdisk, DOS compatible mode still enabled. Actual results: DOS compatible mode remains enabled. Expected results: DOS compatible mode is disabled. Additional info: * The mainboard is a Tyan S5510GM3NR (http://tyan.com/product_SKU_spec.aspx?ProductType=MB&pid=698&SKU=600000217) * The hard drive is a Seagate ST9500420ASG (http://www.seagate.com/ww/v/index.jsp?vgnextoid=3a07bfafecadd110VgnVCM100000f5ee0a0aRCRD&locale=en-US) This is a very basic setup; No RAID controller or otherwise special configuration. Kernel; Linux an-node01.alteeve.com 2.6.32-220.el6.x86_64 #1 SMP Wed Nov 9 08:03:13 EST 2011 x86_64 x86_64 x86_64 GNU/Linux lspci and dmidecode attached.
Created attachment 546846 [details] dmidecode from one of the effected nodes.
(In reply to comment #0) > In my test system, I have a single SATA platter drive. When I modify the disk > using 'fdisk -u /dev/sda', it alerts that "DOS-compatible mode is deprecated". > I press 'c' to disable this, 'w' write out the changes and reboot. Once > rebooted, I try to again configure the disk and get the same message. This is correct behaviour. The (non)DOS mode is about a way how fdisk calculates some offsets and partitions sizes. The mode is not enabled or disabled according to on-disk data (partition table). Note that this is temporary solution for RHEL6 for backward compatibility with initial RHEL6 release; RHEL>=7 will use the non-DOS mode by default and 'u' and 'c' commands will be unnecessary.