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On HPE Cray XD665 systems running Ubuntu 24.04.03, Ubuntu 22.04.03, or Ubuntu 22.04.05 with direct-attached NVMe (Micron 7450) drives installed, the drives may not be detected during the Ubuntu installation. In some cases, only the boot device is displayed, or no storage devices are displayed.This occurs due to the Ubuntu MMIO resource reallocation strategy. The direct attached NVMe (Micron 7450) drives can be detected on Ubuntu 24.04.02 only after disabling PCI resource reallocation in GRUB.
Any HPE Cray XD665 system running Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, or Ubuntu 24.04 LTS with direct attached NVMe (Micron 7450) drives installed.
To ensure that the options of direct attached NVMe (Micron 7450) drives are detected, add the kernel parameter "pci=realloc=off" to GRUB as shown below:Open the /etc/default/grub file using a text editor such as vi or vim (e.g., vim /etc/default/grub).Modify the line starting with GRUB_CMDLINE_LINUX_DEFAULT= by adding "pci=realloc=off" within the quotation marks, as shown below:Save and close the file. Then, update the GRUB configuration using the appropriate commands and reboot the server. After reboot, the driver should be able to communicate with all drives.sudo update-grubsudo update-initramfs -usudo reboot nowThe following CA can also be referenced for more infomation:Advisory: Ubuntu - AMD GPUs or NVIDIA GPUs and PCIe Network Adapters May Not Be Detected by the Option Card Device Driver on HPE Systems Running Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, or Ubuntu 24.04 LTS
Operating Systems Affected:Ubuntu 22.04 LTS, Ubuntu 24.04 LTS
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