SDI, RAID, and IB hardware drivers of the BMS are related to the kernel. You are not advised to upgrade the kernel version.
If you have upgraded the kernel, perform the operations in this section. This section uses CentOS 7.2 as an example to describe how to set the BMS OS to start from the default kernel if you have upgraded the kernel.
[root@bms-centos ~]# uname -a Linux bms-centos 3.10.0-327.el7.x86_64 #1 SMP Thu Nov 29 14:49:43 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
As shown in the following figure, 3.10.0-327.el7.x86_64 is the default kernel version and 3.10.0-862.3.2.el7.x86_64 is the upgraded kernel version.
grub2-set-default "CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)"
[root@bms-centos ~]# grub2-editenv list saved_entry-CentOS Linux (3.10.0-327.el7.x86_64) 7 (Core)