IBM Support

The logical partition takes a long time to boot from a PCIe version 4.0 NVMe adapter

Flashes (Alerts)


Abstract

The boot time for the GRUB boot loader of the device increases along with the shutdown notification time. This boot time is expected to increase for PCIe4 Non-Volatile Memory Express (NVMe) devices that contain the boot partition.

Content

Linux® Releases Affected
Red Hat Enterprise Linux 8.2, or later
SUSE Linux Enterprise Linux 15, Service Pack 2, or later

IBM® Systems Affected
All IBM® POWER9™ systems
I/O Devices Affected
EC7A: PCIe4 x8 1.6TB LP NVMe adapter
EC7B: PCIe4 x8 1.6TB NVMe adapter
EC7C: PCIe4 x8 3.2TB LP NVMe adapter
EC7D: PCIe4 x8 3.2TB NVMe adapter
EC7E: PCIe4 x8 6.4TB LP NVMe adapter
EC7F: PCIe4 x8 6.4TB NVMe adapter
Description
During the boot process, the GRUB bootloader sends requests to the firmware to open and close the devices. The number of requests can vary with the configuration of the GRUB bootloader, the number of disks that are available in the system, disk partitions schema, and other configurations. You might not notice huge delays in most configurations of the bootloader. In cases where large PCIe4 NVMe devices are used, the boot time can increase significantly. Larger PCIe4 NVMe devices have longer shutdown notification time, which is noticeable on every close call that is issued to a device.
Workaround
There is no workaround for this issue currently.
Fix Outlook:
Red Hat® Enterprise Linux® 8.2
Red Hat® Enterprise Linux® 8.3
SUSE Linux Enterprise Server 15 Service Pack 2
SUSE bug numbers:
1177751
Red Hat bug numbers:
1862632

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Document Information

Modified date:
09 November 2020

UID

ibm16361675

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