Bug 2229864 - RHOSP node(s) with root disk greater than 2TiB might fail to boot with newer kernel
Summary: RHOSP node(s) with root disk greater than 2TiB might fail to boot with newer ...
Keywords:
Status: NEW
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: documentation
Version: 16.2 (Train)
Hardware: x86_64
OS: Linux
unspecified
medium
Target Milestone: ---
: ---
Assignee: RHOS Documentation Team
QA Contact: RHOS Documentation Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-08-08 04:54 UTC by Apoorv Verma
Modified: 2023-08-08 18:14 UTC (History)
1 user (show)

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Red Hat Issue Tracker OSP-27278 0 None None None 2023-08-08 04:57:06 UTC

Description Apoorv Verma 2023-08-08 04:54:18 UTC 
Description of problem:
OSP node with root disk size greater than 2Tib might fail to boot with newer installed kernel if it's initramfs is built at a location above 2Tib from starting sector due to no free space within 2TiB of space.

Relevant documentation links with "Warning" :
[RHEL-7 8.14.4.4. Recommended Partitioning Scheme](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/installation_guide/sect-disk-partitioning-setup-x86#sect-recommended-partitioning-scheme-x86)
[RHEL-8 B.4. Recommended partitioning scheme](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/performing_a_standard_rhel_8_installation/index#recommended-partitioning-scheme_partitioning-reference)
[RHEL-9](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/9/html-single/performing_a_standard_rhel_9_installation/index#recommended-partitioning-scheme_partitioning-reference)

In such scenario, different "/boot" partition should be present via "Whole Disk".

The main overcloud image is a flat partition image. This means it contains no partitioning information or bootloader on the images itself.

Reference : [Appendix C. Whole Disk Images](https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html-single/director_installation_and_usage/index#appe-Whole_Disk_Images)

Similar warning should be present in all Red Hat OpenStack deployment documents for "root" disks size greater than 2TiB.
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