[[email protected]:/root]#df -m
Filesystem 1M-blocks Used Available Use% Mounted on
/dev/sda3 17599 15619 1072 94% /
/dev/sda1 251 16 223 7% /boot
tmpfs 760 0 760 0% /dev/shm
/dev/sdb3 30236 23542 5159 83% /data
原來是因為本來空間就不大，只有50多個G，du一路查下去，發現是cgi的日志文件和so的core文件占用了很大的空間，但是想想也沒啥可清理的了。(注：檢查磁盤空間占用，可以用du -ah --max-depth=1，打印當前目錄下，各個文件大小和目錄的磁盤空間占用情況，也可以在後面指定顯示某個目錄的子目錄和文件空間占用信息)
因為還有一塊20G的老硬盤閒置在那裡，所以就干脆把它掛上去。
1、拆機，硬盤掛上
2、重啟機器，fdisk -l 查看
[[email protected]:/dev]#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 33 265041 83 Linux
/dev/sda2 34 294 2096482+ 82 Linux swap / Solaris
/dev/sda3 295 2610 18603270 83 Linux
Disk /dev/sdb: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb3 1 3916 31455238+ 83 Linux
Disk /dev/sdc: 21.4 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdc doesn't contain a valid partition table
很好,剛掛上去的第三塊盤認到了，sdc，21.4G,不過盤上還沒有任何分區。
3、創建分區。執行 fdisk /dev/sdc
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 2610.
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):
提示我輸入命令，可憐的記不住命令，只能打一個m，for help了 ^-^
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)
大概看了一個m出來的命令，毫不猶豫選擇了 n ,添加一個新分區
Command (m for help): n
Command action
e extended
p primary partition (1-4)
e
Partition number (1-4): 1
First cylinder (1-2610, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-2610, default 2610):
Using default value 2610
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
最後一個w是把分區信息寫入磁盤並退出fdisk。
然後執行fdisk -l
[[email protected]:/dev]#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 33 265041 83 Linux
/dev/sda2 34 294 2096482+ 82 Linux swap / Solaris
/dev/sda3 295 2610 18603270 83 Linux
Disk /dev/sdb: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb3 1 3916 31455238+ 83 Linux
Disk /dev/sdc: 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/sdc1 1 2610 20964793+ 5 Extended
得意忘形了一下，然後直接執行
mount /dev/sdc1 /datalog
就被潑了冷水
[[email protected]:/dev]#mount /dev/sdc1 /datalog
mount: you must specify the filesystem type
[[email protected]:/dev]#mount -t ext3 /dev/sdc1 /datalog
mount: wrong fs type, bad option, bad superblock on /dev/sdc1,
missing codepage or other error
(aren't you trying to mount an extended partition,
instead of some logical partition inside?)
In some cases useful info is found in syslog - try
dmesg | tail or so
才想到創建了邏輯盤還沒有創建邏輯分區呢，也沒有創建文件系統，然後再執行一下：fdisk /dev/sdc
Command (m for help): n
Command action
l logical (5 or over)
p primary partition (1-4)
l
First cylinder (1-2610, default 1):
Using default value 1
Last cylinder or +size or +sizeM or +sizeK (1-2610, default 2610):
Using default value 2610
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
再查看一下
[[email protected]:/root]#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 33 265041 83 Linux
/dev/sda2 34 294 2096482+ 82 Linux swap / Solaris
/dev/sda3 295 2610 18603270 83 Linux
Disk /dev/sdb: 32.2 GB, 32212254720 bytes
255 heads, 63 sectors/track, 3916 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb3 1 3916 31455238+ 83 Linux
Disk /dev/sdc: 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/sdc1 1 2610 20964793+ 5 Extended
/dev/sdc5 1 2610 20964762 83 Linux
很好，一切正常
4、創建文件系統
執行mkfs.ext3 /dev/sdc5
mke2fs 1.39 (29-May-2006)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
2621440 inodes, 5241190 blocks
262059 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
160 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
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
正常
5、掛載到根目錄下的datalog目錄
mount /dev/sdc5 /datalog
再執行df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/sda3 18020368 15983692 1106516 94% /
/dev/sda1 256666 15923 227491 7% /boot
tmpfs 777688 0 777688 0% /dev/shm
/dev/sdb3 30961664 24018284 5370620 82% /data
/dev/sdc5 20635668 176200 19411232 1% /datalog
都正常了。完美解決。
