linux下多路径管理一例

[root@x3650 mapper]# fdisk -l

 

Disk /dev/sda: 299.4 GB, 299439751168 bytes

255 heads, 63 sectors/track, 36404 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       36404   292310707+  8e  Linux LVM

 

Disk /dev/sdb: 644.2 GB, 644245094400 bytes

255 heads, 63 sectors/track, 78325 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1       78325   629145531   83  Linux

 

Disk /dev/sdc: 644.2 GB, 644245094400 bytes

255 heads, 63 sectors/track, 78325 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

/dev/sdc1               1       78325   629145531   83  Linux

 

Disk /dev/dm-2: 644.2 GB, 644245094400 bytes

255 heads, 63 sectors/track, 78325 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

     Device Boot      Start         End      Blocks   Id  System

/dev/dm-2p1               1       78325   629145531   83  Linux

 

Disk /dev/dm-3: 644.2 GB, 644245023744 bytes

255 heads, 63 sectors/track, 78324 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

Disk /dev/dm-3 doesn't contain a valid partition table

 

[root@x3650 mapper]# fdisk /dev/sdb

 

The number of cylinders for this disk is set to 78325.

There is nothing wrong with that, but this is larger than 1024,

and could in certain setups cause problems with:

1) software that runs at boot time (e.g., old versions of LILO)

2) booting and partitioning software from other OSs

   (e.g., DOS FDISK, OS/2 FDISK)

 

Command (m for help): m

Command action

   a   toggle a bootable flag

   b   edit bsd disklabel

   c   toggle the dos compatibility flag

   d   delete a partition

   l   list known partition types

   m   print this menu

   n   add a new partition

   o   create a new empty DOS partition table

   p   print the partition table

   q   quit without saving changes

   s   create a new empty Sun disklabel

   t   change a partition's system id

   u   change display/entry units

   v   verify the partition table

   w   write table to disk and exit

   x   extra functionality (experts only)

 

Command (m for help): d

Selected partition 1

 

Command (m for help): 1

1: unknown command

Command action

   a   toggle a bootable flag

   b   edit bsd disklabel

   c   toggle the dos compatibility flag

   d   delete a partition

   l   list known partition types

   m   print this menu

   n   add a new partition

   o   create a new empty DOS partition table

   p   print the partition table

   q   quit without saving changes

   s   create a new empty Sun disklabel

   t   change a partition's system id

   u   change display/entry units

   v   verify the partition table

   w   write table to disk and exit

   x   extra functionality (experts only)

 

Command (m for help): w

The partition table has been altered!

 

Calling ioctl() to re-read partition table.

Syncing disks.

[root@x3650 mapper]# fdisk /dev/sdc

 

The number of cylinders for this disk is set to 78325.

There is nothing wrong with that, but this is larger than 1024,

and could in certain setups cause problems with:

1) software that runs at boot time (e.g., old versions of LILO)

2) booting and partitioning software from other OSs

   (e.g., DOS FDISK, OS/2 FDISK)

 

Command (m for help): m

Command action

   a   toggle a bootable flag

   b   edit bsd disklabel

   c   toggle the dos compatibility flag

   d   delete a partition

   l   list known partition types

   m   print this menu

   n   add a new partition

   o   create a new empty DOS partition table

   p   print the partition table

   q   quit without saving changes

   s   create a new empty Sun disklabel

   t   change a partition's system id

   u   change display/entry units

   v   verify the partition table

   w   write table to disk and exit

   x   extra functionality (experts only)

 

Command (m for help): d

Selected partition 1

 

Command (m for help): 1

1: unknown command

Command action

   a   toggle a bootable flag

   b   edit bsd disklabel

   c   toggle the dos compatibility flag

   d   delete a partition

   l   list known partition types

   m   print this menu

   n   add a new partition

   o   create a new empty DOS partition table

   p   print the partition table

   q   quit without saving changes

   s   create a new empty Sun disklabel

   t   change a partition's system id

   u   change display/entry units

   v   verify the partition table

   w   write table to disk and exit

   x   extra functionality (experts only)

 

Command (m for help): w

The partition table has been altered!

 

Calling ioctl() to re-read partition table.

Syncing disks.

 

[root@x3650 mapper]# /etc/init.d/multipathd stop

姝ｅ湪鍏抽棴multipathd 绔彛鐩戞帶绋嬪簭锛?[60G[纭畾]

[root@x3650 mapper]# /etc/init.d/multipathd start

姝ｅ湪鍚姩瀹堟姢杩涚▼multipathd锛?[60G[纭畾]

[root@x3650 mapper]# multipath –F

   Device Boot      Start         End      Blocks   Id  System

[root@x3650 mapper]# multipath -v2

create: mpath1 (360050763008080d14800000000000006)  IBM,2145

[size=600G][features=1 queue_if_no_path][hwhandler=0][n/a]

_ round-robin 0 [prio=50][undef]

 _ 7:0:0:0 sdb 8:16  [undef][ready]

_ round-robin 0 [prio=10][undef]

 _ 7:0:1:0 sdc 8:32  [undef][ready]

[root@x3650 mapper]# fdisk -l

 

Disk /dev/sda: 299.4 GB, 299439751168 bytes

255 heads, 63 sectors/track, 36404 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       36404   292310707+  8e  Linux LVM

 

Disk /dev/sdb: 644.2 GB, 644245094400 bytes

255 heads, 63 sectors/track, 78325 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

 

Disk /dev/sdc: 644.2 GB, 644245094400 bytes

255 heads, 63 sectors/track, 78325 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

   Device Boot      Start         End      Blocks   Id  System

 

Disk /dev/dm-2: 644.2 GB, 644245094400 bytes

255 heads, 63 sectors/track, 78325 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

 

     Device Boot      Start         End      Blocks   Id  System