add a disk to linux

在xen上增加一個disk,當人是vritual的：）

[root@Mocktrade dev]# fdisk /dev/xvdb  ＃ xvdb 難道xen下的disk都是xvdx嗎？
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 4895.
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)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
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): n
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-4895, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-4895, default 4895):
Using default value 4895
Command (m for help): p
Disk /dev/xvdb: 40.2 GB, 40265318400 bytes
255 heads, 63 sectors/track, 4895 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
    Device Boot      Start         End      Blocks   Id  System
/dev/xvdb1               1        4895    39319056   83  Linux
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@ dev]#
[root@ dev]#
[root@ dev]# mkfs
mkfs         mkfs.cramfs  mkfs.ext2    mkfs.ext3
[root@ dev]# mkfs.ext3 -b 4096 /dev/xvdb1
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
4915200 inodes, 9829764 blocks
491488 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
300 block groups
32768 blocks per group, 32768 fragments per group
16384 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information:
done
This filesystem will be automatically checked every 29 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

[root@ /]# df
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/xvda3            26306612   7741500  17207220  32% /
/dev/xvda1              101086     19708     76159  21% /boot
tmpfs                  1572864         0   1572864   0% /dev/shm
[root@ /]# mkdir /u01


[root@/]# mount /dev/xvdb1 /u01
[root@ /]# cd /u01
[root@ u01]# touch reame.txt
[root@ u01]# ls
lost+found  reame.txt
[root@ u01]# cd /etc
[root@ etc]# vi fstab

cat /etc/fstab
LABEL=/                 /                       ext3    defaults        1 1
LABEL=/boot             /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/xvdb1             /u01                   ext3    defaults        1 1
LABEL=SWAP-xvda2        swap                    swap    defaults        0 0

[root@ etc]# df -lh
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvda3             26G  7.4G   17G  32% /
/dev/xvda1             99M   20M   75M  21% /boot
tmpfs                 1.5G     0  1.5G   0% /dev/shm
/dev/xvdb1             37G  177M   35G   1% /u01
[root@]#

reboot

記錄一下，備忘！