Re: VFS: Unable to mount root fs on unknown-block(0,0)

[泰宇周]

Hi Peter
Thanks you so much.
I tried to specify corresponding initramfs to QEMU as following
qemu-system-x86_64 \
    -kernel /boot/vmlinuz-`uname -r` \
        -m 4G \
        -initrd /boot/initramfs-`uname -r`.img \
    -sda centos79.img \
    -append "root=/dev/sda console=ttyS0" \
    -enable-kvm -nographic

It worked for me to boot the kernel.
However, I still can’t enter the system.
Qemu reported following information


 [  OK  ] Reached target System Initialization.
         Starting dracut initqueue hook...
         Starting Show Plymouth Boot Screen...
[  OK  ] Started Show Plymouth Boot Screen.
[  OK  ] Reached target Paths.
[  OK  ] Reached target Basic System.
[  181.930451] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  182.449479] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  182.968450] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  183.487482] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  184.006435] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  184.525464] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  185.044444] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  185.563430] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  186.082448] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  186.601681] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  187.120630] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  187.639579] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  188.158458] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  188.677459] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  189.196840] dracut-initqueue[284]: Warning: dracut-initqueue timeout - 
starting timeout scripts
[  189.197064] dracut-initqueue[284]: Warning: Could not boot.
[  189.279572] dracut-initqueue[284]: Warning: /dev/sda does not exist
         Starting Dracut Emergency Shell...
Warning: /dev/sda does not exist

Generating "/run/initramfs/rdsosreport.txt"


Entering emergency mode. Exit the shell to continue.
Type "journalctl" to view system logs.
You might want to save "/run/initramfs/rdsosreport.txt" to a USB stick or /boot
after mounting them and attach it to a bug report.


dracut:/# ls
bin  dracut-state.sh  init  lib64  root  sbin      sys      tmp  var
dev  etc              lib   proc   run   shutdown  sysroot  usr
dracut:/# ls dev/
autofs           mcelog    stdout  tty2   tty32  tty45  tty58  udmabuf
char             mem       tty     tty20  tty33  tty46  tty59  urandom
console          null      tty0    tty21  tty34  tty47  tty6   usbmon0
core             nvram     tty1    tty22  tty35  tty48  tty60  vcs
cpu              port      tty10   tty23  tty36  tty49  tty61  vcs1
cpu_dma_latency  ptmx      tty11   tty24  tty37  tty5   tty62  vcsa
dma_heap         pts       tty12   tty25  tty38  tty50  tty63  vcsa1
fd               random    tty13   tty26  tty39  tty51  tty7   vcsu
full             rtc       tty14   tty27  tty4   tty52  tty8   vcsu1
hpet             rtc0      tty15   tty28  tty40  tty53  tty9   vga_arbiter
hwrng            shm       tty16   tty29  tty41  tty54  ttyS0  zero
input            snapshot  tty17   tty3   tty42  tty55  ttyS1
kmsg             stderr    tty18   tty30  tty43  tty56  ttyS2
log              stdin     tty19   tty31  tty44  tty57  ttyS3

I can't find the sda or hda in the /dev directory inside qemu.

What should I do to fix this problem?

Sincerely!