The server did a hardware raid check on the Internet for a long time and didn't see that you can clearly see the raid command without shutting down.
The specific practice is as follows:
root@ubuntu:~# df -h Filesystem Size Used Avail Use% Mounted on udev 63G 0 63G 0% /dev tmpfs 13G 82M 13G 1% /run /dev/sda3 491G 190G 276G 41% / tmpfs 63G 0 63G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 63G 0 63G 0% /sys/fs/cgroup /dev/sdb 3.6T 1.1T 2.4T 31% /iflytek /dev/sda1 180M 56M 111M 34% /boot tmpfs 13G 0 13G 0% /run/user/0
/As can be seen above, the available disk size is about 4T +;
root@ubuntu:~# cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: PM8060- Model: R1 Rev: V1.0 Type: Direct-Access ANSI SCSI revision: 02 Host: scsi0 Channel: 00 Id: 01 Lun: 00 Vendor: PM8060- Model: R2 Rev: V1.0 Type: Direct-Access ANSI SCSI revision: 02 Host: scsi0 Channel: 01 Id: 00 Lun: 00 Vendor: SEAGATE Model: ST600MM0208 Rev: N001 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 01 Id: 01 Lun: 00 Vendor: SEAGATE Model: ST600MM0208 Rev: N001 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 01 Id: 02 Lun: 00 Vendor: HGST Model: HUS726020AL5210 Rev: A907 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 01 Id: 03 Lun: 00 Vendor: HGST Model: HUS726020AL5210 Rev: A907 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 01 Id: 04 Lun: 00 Vendor: HGST Model: HUS726020AL5210 Rev: A907 Type: Direct-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 03 Id: 00 Lun: 00 Vendor: ADAPTEC Model: Virtual SGPIO Rev: 1 Type: Enclosure ANSI SCSI revision: 05 root@ubuntu:~#
You can go to Baidu for specific capacity information according to the disk model shown in the above command:
ST600MM0208 Seagate 600G * 2
HUS726020AL5210 Hitachi 2tb * 3
To sum up, we can see that the total disk capacity is more than 7T
But it only used more than 4T in practice. It must have been raid