Explain the CentOS new hard disk and rescan bus solution

Centos After adding a new hard disk, the system cannot automatically recognize it.

1. Since you don’t know where the new hard drive is mounted, you can first check the adapter mounted on the existing hard drive.

[root@localhost ~]# ls -l /sys/block/sda
lrwxrwxrwx. 1 root root 0 Jun 15 11:47 /sys/block/sda -> ../devices/pci0000:00/0000:00:10.0/host32/target32:0:0/32:0:0:0/block/sda

2. If you find that the disk is being mounted to host32, you can try using the following command to rescan the host32 information

echo "- - -" > /sys/class/scsi_host/host32/scan

3. After the execution is completed, dmesg can view the new hard disk information.

[  620.865767] scsi 32:0:1:0: Direct-Access     VMware,  VMware Virtual S 1.0  PQ: 0 ANSI: 2[  620.865800] scsi target32:0:1: Beginning Domain Validation
[  620.866413] scsi target32:0:1: Domain Validation skipping write tests
[  620.866416] scsi target32:0:1: Ending Domain Validation
[  620.866450] scsi target32:0:1: FAST-40 WIDE SCSI 80.0 MB/s ST (25 ns, offset 127)
[  620.870284] sd 32:0:1:0: Attached scsi generic sg2 type 0[  620.870360] sd 32:0:1:0: [sdb] 2097152 512-byte logical blocks: (1.07 GB/1.00 GiB)
[  620.870408] sd 32:0:1:0: [sdb] Write Protect is off
[  620.870410] sd 32:0:1:0: [sdb] Mode Sense: 61 00 00 00[  620.870734] sd 32:0:1:0: [sdb] Cache data unavailable
[  620.870736] sd 32:0:1:0: [sdb] Assuming drive cache: write through
[  620.874775] sd 32:0:1:0: [sdb] Cache data unavailable
[  620.874779] sd 32:0:1:0: [sdb] Assuming drive cache: write through
[  620.875859]  sdb: unknown partition table
[  620.876069] sd 32:0:1:0: [sdb] Cache data unavailable
[  620.876071] sd 32:0:1:0: [sdb] Assuming drive cache: write through
[  620.876123] sd 32:0:1:0: [sdb] Attached SCSI disk

4. fdisk -l can find the /dev/sdb information in your heart

Disk /dev/sdb: 1073 MB, 1073741824 bytes, 2097152 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

5. Now you can use fdisk -l or parted command to perform partitioning operations.

Delete the /dev/sdb hard drive from the bus (after deletion, the /dev/sdb hard drive will no longer be recognized)

echo 1 > /sys/block/sdb/device/delete

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