Shulou(Shulou.com)06/02 Report--

The following is a brief introduction to a method to identify new disks without restarting linux.

Environment description:

OS: Redhat linux 5.4x86 (host is vmware virtual host)

Add a 50G lun

Method 1:

one。 Commands to manually add disks

# echo "scsi add-single-device w x y z" > / proc/scsi/scsi

For the command to work properly, you must specify the correct parameter values w, x, y, and z, as follows:

W is the host adapter identity, and the first adapter is zero (0)

X is the SCSI channel on the host adapter, and the first channel is zero (0)

Y is the SCSI ID of the device

Z is the LUN number, the first LUN is zero (0)

two。 Before executing the command, check the / proc/scsi/scsi file to determine the id of the new disk

Attached devices:

Host: scsi0 Channel: 00 Id: 00 Lun: 00

Vendor: VMware Model: Virtual disk Rev: 1.0

Type: Direct-Access ANSI SCSI revision: 02

Host: scsi0 Channel: 00 Id: 01 Lun: 00

Vendor: VMware Model: Virtual disk Rev: 1.0

Type: Direct-Access ANSI SCSI revision: 02

Host: scsi0 Channel: 00 Id: 02 Lun: 00

Vendor: VMware Model: Virtual disk Rev: 1.0

Type: Direct-Access ANSI SCSI revision: 02

Host: scsi0 Channel: 00 Id: 03 Lun: 00

Vendor: VMware Model: Virtual disk Rev: 1.0

Type: Direct-Access ANSI SCSI revision: 02

Host: scsi0 Channel: 00 Id: 04 Lun: 00

Vendor: VMware Model: Virtual disk Rev: 1.0

Type: Direct-Access ANSI SCSI revision: 02

You can see that the largest id is 04, and the ID of the new disk should be 5. 5.

three。 Execute the fdisk-l command to check the current disk condition

[root@soadb scsi] # fdisk-l

Disk / dev/sda: 21.4 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/ dev/sda1 * 1 13 104391 83 Linux

/ dev/sda2 14 2610 20860402 + 8e Linux LVM

.

Disk / dev/sde: 53.6 GB, 53687091200 bytes

255 heads, 63 sectors/track, 6527 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk / dev/sde doesn't contain a valid partition table

four。 Execute a command

# echo "scsi add-single-device 0 050" > / proc/scsi/scsi

five。 Execute the fdisk command to check the result

[root@soadb scsi] # fdisk-l

.

Disk / dev/sde: 53.6 GB, 53687091200 bytes

255 heads, 63 sectors/track, 6527 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk / dev/sde doesn't contain a valid partition table

Disk / dev/sdf: 53.6 GB, 53687091200 bytes

255 heads, 63 sectors/track, 6527 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk / dev/sdf doesn't contain a valid partition table

As you can see, the new 50G disk has been identified in the operating system, and the device name is / dev/sdf.

The device can be used at this time.

Method 2:

[root@localhost ~] # fdisk-l

Disk / dev/sda: 21.4 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/ dev/sda1 * 1 13 104391 83 Linux

/ dev/sda2 14 2610 20860402 + 8e Linux LVM

[root@localhost ~] # echo "- -" > / sys/class/scsi_host/host0/scan

[root@localhost ~] # fdisk-l

Disk / dev/sda: 21.4 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/ dev/sda1 * 1 13 104391 83 Linux

/ dev/sda2 14 2610 20860402 + 8e Linux LVM

Disk / dev/sdb: 21.4 GB, 21474836480 bytes

255 heads, 63 sectors/track, 2610 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk / dev/sdb doesn't contain a valid partition table

Original blog address: http://blog.chinaunix.net/uid-26557245-id-3307138.html

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