Linux online New hard disk, the system does not restart the recognition of new hard disk

Do not want to shut down the system directly add disk, found that the Linux system does not automatically recognize the newly added hard disk;

1. View the existing disk, only one disk SDA;

[Email protected] ~]# fdisk-l

disk/dev/sda:21.5 GB, 21474836480 bytes, 41943040 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes

Disk label Type:dos

Disk identifier:0x000c4c5a

Device Boot Start End Blocks Id System

/DEV/SDA1 * 2048 2099199 1048576 Linux

/dev/sda2 2099200 41943039 19921920 8e Linux LVM

disk/dev/mapper/cl-root:19.3 GB, 19318964224 bytes, 37732352 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes

disk/dev/mapper/cl-swap:1073 MB, 1073741824 bytes, 2097152 sectors

Units = sectors of 1 * MB = bytes

Sector size (logical/physical): bytes/512 bytes

I/O size (minimum/optimal): bytes/512 bytes

2. Add a disk 30G

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3. Cannot be mounted directly on the Linux system, the newly added drive cannot be found using fdisk-l

4. View the host bus number

ls/sys/class/scsi_host/

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5. Re-scan the SCSI bus to add the device

echo "---" >/sys/class/scsi_host/host0/scan
echo "---" >/sys/class/scsi_host/host1/scan
echo "---" >/sys/class/scsi_host/host2/scan

' ---' Representative Channel , Target and the LUNs numbering

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6. Re-execute fdisk-l new SDB appears, next can be partitioned as required

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Linux online New hard disk, the system does not restart the recognition of new hard disk