Change of the number of PCI
if a carrier card has four NVMe SSD, But the number of PCI slot on a carrier card is more one than what PCI switch perceives.
So, I couldn’t boot OS, and I could’nt even enter BIOS state. then What is the solution of this problem.
That is to reduce the number of PCI slot on a carrier card.
If the number of PCI slot is wrong like this.
the number of PCI slot is more one than what PCI switch perceives.
$ lspci -tv
-[0000:00]-+-00.0 Intel Corporation
.......
+-1c.0-[01]--
+-1c.3-[02-03]----00.0-[03]--
+-1c.4-[04-0a]----00.0-[05-0a]--+-01.0-[06]----00.0 Device SSD
| +-02.0-[07]----00.0 Device SSD
| +-08.0-[08]--
| +-09.0-[09]----00.0 Device SSD
| \-0a.0-[0a]----00.0 Device SSD
+-1d.0 Intel Corporation
.....
As you can see even though devices is four on a card, PCI slot is five.
I have to reduce this PCI slot Writing to the EEPROM with binary file.
That binary file is to reduce one of PCI slots like this.
$ lspci -tv
-[0000:00]-+-00.0 Intel Corporation
.........
+-1c.0-[01]--
+-1c.3-[02-03]----00.0-[03]--
+-1c.4-[04-0a]--+-[0000:0a]---00.0 Device SSD
| +-[0000:09]---00.0 Device SSD
| +-[0000:07]---00.0 Device SSD
| +-[0000:06]---00.0 Device SSD
| +-[0000:05]-+-01.0 PLX Technology, Inc. Device SSD
| | +-02.0 PLX Technology, Inc. Device SSD
| | +-08.0 PLX Technology, Inc. Device SSD
| | +-09.0 PLX Technology, Inc. Device SSD
| | \-0a.0 PLX Technology, Inc. Device SSD
| \-[0000:04]---00.0 PLX Technology, Inc. Device SSD
+-1d.0 Intel Corporation
........
let’s another An examle
this change is implement with only PCI board without SSD
$ lspci -tv
-[0000:00]-+-00.0 Intel Corporation
..........
+-1c.0-[01]--
+-1c.3-[02-03]----00.0-[03]--
+-1c.4-[04-0a]----00.0-[05-0a]--+-01.0-[06]--
| +-02.0-[07]--
| +-08.0-[08]--
| +-09.0-[09]--
| \-0a.0-[0a]--
...........
after writting to the EEPROM with file(binary file), the follwoing
$ lspci -tv
-[0000:00]-+-00.0 Intel Corporation
..........
+-1c.0-[01]--
+-1c.3-[02-03]----00.0-[03]--
+-1c.4-[04-09]----00.0-[05-09]--+-01.0-[06]--
| +-02.0-[07]--
| +-09.0-[08]--
| \-0a.0-[09]--
+-1d.0 Intel Corporation
..........
since the number of PCI slots is reduced, I could reboot OS
I used GUI tooo on windows(PLX)to change the number of PCI slot.
BackGround shell
if you want to execute shell’s mutiple commands together, use &
[root@hyunyoung.lee ~]# for i in `seq 0 15`; do (nvme format /dev/nvme${i}n1 &); done
[root@hyunyoung.lee ~]# Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
Success formatting namespace:0
As you can see the above result, you can check those 15 process of command executed together.
don’t forget &