Do not restart Linux, manually identify the method of adding new disks online
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
