What should I do if the centos system cannot start after upgrading the kernel?

The solution process is as follows:

Query the 3.10.0 initramfs driver

[root@localhost ~]# lsinitrd -k 3.10.0-957.el7.x86_64 | grep mpt[23]sas
drwxr-xr-x 2 root root 0 Nov 12 19:24 usr/lib/modules/3.10.0-957.el7.x86_64/kernel/drivers/scsi/mpt3sas
-rw-r--r-- 1 root root 92972 Nov 9 2018 usr/lib/modules/3.10.0-957.el7.x86_64/kernel/drivers/scsi/mpt3sas/mpt2sas.ko.xz

You can see that it is the mpt2sas driver in the 3.10 kernel, but in In the 5.x kernel, I saw that the new version of the kernel has upgraded mpt2sas to mpt3sas

[root@localhost ~]# ls /usr/lib/modules/5.3.6-1.el7.elrepo.x86_64/kernel/drivers/scsi/mpt3sas/mpt3sas.ko
/usr/lib/modules/5.3.6-1.el7.elrepo.x86_64/kernel/drivers/scsi/mpt3sas/mpt3sas.ko

(Recommended tutorial: centos usage tutorial)

Query the 5.3.6 initramfs driver , you can see that there is no output, indicating that initramfs has not entered this driver.

[root@localhost ~]# lsinitrd -k 5.3.6-1.el7.elrepo.x86_64 | grep mpt[23]sas

The solution is as follows:

Method 1:

1. Modify the /etc/dracut.conf file and add fields

sed -i '/#add_drivers+=""/aadd_drivers+="mpt3sas"' /etc/dracut.conf

2 , Regenerate initramfs

cd /boot/
mv initramfs-5.3.6-1.el7.elrepo.x86_64.img{,.bak}
dracut -f /boot/initramfs-5.3.6-1.el7.elrepo.x86_64.img 5.3.6-1.el7.elrepo.x86_64

Method 2:

Force loading of the driver

dracut --force --add-drivers mpt3sas --kver=5.3.6

Choose one of the above methods to integrate the driver, and then do the following Check:

lsinitrd -k 5.3.6-1.el7.elrepo.x86_64 | grep mpt[23]sas

If there is output, it is normal, then restart the operating system.

Recommended related video tutorials: linux video tutorial

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