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Ａ、磁盘配额作用限制普通用户使用磁盘空间，不至于因为个别人的浪费而影响到其它人的正常使用；
Ｂ、需要内核的支持；
Ｃ、只有Ext2/Ext3文件系统目前支持这种功能；
Ｄ、需要用户程序quota软件包. 磁盘配额配置过程
１）、使用usrquota，grpquota选项挂载一个分区，激活内核的支持（只能在分区上做）
２）、方法：#mount ?o usrquota,grpquota /dev/sdb1 /mnt/d1
或 mount ?o remount,usrquota,grpquota / (因为根目录已经挂载过，可重新挂载)
３）、init 1 （进入单用户环境来配置） ４）、quotacheck ?cvuga 检查并创建磁盘配额的数据库文件（存放位置：在每一个分区的根目录下面）
-c： 创建create； ?v：更详细地表述；?u：用户user；?g：组group；-a：所有all
５）、edquota ?u <username>为指定用户分配磁盘空间和节点数量
６）、quota命令可以查看用户的配额使用情况
如：[root@localhost root]# ls /mnt
cdrom floppy
[root@localhost root]# mkfs.ext3 /dev/sdb1 /mnt/sd1/ mke2fs 1.32 (09-Nov-2002)
mkfs.ext3: bad blocks count – /mnt/sd1/
[root@localhost root]# mkfs.ext3 -f /dev/sdb1 /mnt/sd1/
[root@localhost root]# fdisk -l Disk /dev/sda: 5368 MB, 5368709120 bytes
255 heads, 63 sectors/track, 652 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 652 5237158+ 83 Linux
Disk /dev/sdb: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 250 522 2192872+ 83 Linux
[root@localhost root]# mkfs.ext3 /dev/sdb1 mke2fs 1.32 (09-Nov-2002) Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
274176 inodes, 548218 blocks
27410 blocks (5.00%) reserved for the super user
First data block=0 17 block groups
32768 blocks per group, 32768 fragments per group
16128 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 30 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@localhost root]# mount /dev/sdb1 /mnt/sd1 -o usrquota,grpquota [root@localhost root]# mount
/dev/sda1 on / type ext3 (rw)
none on /proc type proc (rw) usbdevfs on /proc/bus/usb type usbdevfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620) none on /dev/shm type tmpfs (rw)
/dev/sdb1 on /mnt/sd1 type ext3 (rw,usrquota,grpquota)
[root@localhost root]# more /etc/mtab
/dev/sda1 / ext3 rw 0 0
none /proc proc rw 0 0
usbdevfs /proc/bus/usb usbdevfs rw 0 0
none /dev/pts devpts rw,gid=5,mode=620 0 0
none /dev/shm tmpfs rw 0 0
/dev/sdb1 /mnt/sd1 ext3 rw,usrquota,grpquota 0 0
[root@localhost root]# quotacheck ?cvuga <——-
quotacheck: Scanning /dev/sdb1 [/mnt/sd1] done quotacheck: Checked 2 directories and 0 files
[root@localhost root]# ls /mnt/sd1/
aquota.group aquota.user lost+found
aquota.group 和aquota.user两个数据文件，用来分配组和用户的配额情况。
[root@localhost root]# quotaon 或reboot或quotaon /dev/sdb1
[root@localhost root]# edquota -u redhat
Disk quotas for user redhat (uid 502):
Filesystem blocks soft hard inodes soft hard
/dev/sdb1 125 10 0 80 0 10
注：blocks表示：块的数量；inodes表示：节点的数量或建立文件的个数； soft表示：软限制，可以超过这个数值的设定，但是有天数限制；
hard表示：硬限制，这是一个任何时候也不能超过的数值，永远不可能达到。
[root@localhost root]# \ls /mnt/sd1
aquota.group aquota.user lost+found
[root@localhost root]# mkdir /mnt/sd1/redhat
[root@localhost root]# chown redhat /mnt/sd1/redhat/
[root@localhost root]# su – redhat
[redhat@localhost redhat]$ pwd
/home/redhat
[redhat@localhost redhat]$ cd /mnt/sd1/redhat/
[redhat@localhost redhat]$ pwd /mnt/sd1/redhat
[redhat@localhost redhat]$ quota
Disk quotas for user redhat (uid 502):
Filesystem blocks quota limit grace files quota limit grace
/dev/sdb1 4 10 0 1 0 9
[redhat@localhost redhat]$ ls -lh
total 8.0K
drwxrwxr-x 2 redhat redhat 4.0K Mar 12 22:41 dir drwxrwxr-x 2 redhat redhat 4.0K Mar 12 22:41 dir1
[redhat@localhost redhat]$ ls -ld
drwxr-xr-x 4 redhat root 4096 Mar 12 22:41 .
[redhat@localhost redhat]$ dd if=/dev/zero of=file1 bs=1k count=1024
1024+0 records in
1024+0 records out
[redhat@localhost redhat]$ quota -u redhat
Disk quotas for user redhat (uid 502):
Filesystem blocks quota limit grace files quota limit grace
/dev/sdb1 1040* 10 0 6days 4 0 9 [redhat@localhost redhat]$ touch file1
[redhat@localhost redhat]$ touch file2
[redhat@localhost redhat]$ touch file3
[redhat@localhost redhat]$ touch file4
[redhat@localhost redhat]$ touch file5
[redhat@localhost redhat]$ ls
file1 file2 file3 file4 file5 [redhat@localhost redhat]$ quota -u redhat
Disk quotas for user redhat (uid 502):
Filesystem blocks quota limit grace files quota limit grace
/dev/sdb1 1032* 10 0 6days 6 0 9 [redhat@localhost redhat]$ touch file6
[redhat@localhost redhat]$ touch file7
[redhat@localhost redhat]$ touch file8
[redhat@localhost redhat]$ touch file9
sd(8,17): write failed, user file limit reached.
touch: creating `file9′: Disk quota exceeded
[redhat@localhost redhat]$ touch file10
touch: creating `file10′: Disk quota exceeded [redhat@localhost redhat]$ quota -u redhat
Disk quotas for user redhat (uid 502):
Filesystem blocks quota limit grace files quota limit grace
/dev/sdb1 1032* 10 0 6days 9* 0 9
[redhat@localhost redhat]$ cat /etc/fstab
LABEL=/ / ext3 defaults 1 1
none /dev/pts devpts gid=5,mode=620 0 0
none /proc proc defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/cdrom /mnt/cdrom udf,iso9660 noauto,owner,kudzu,ro 0 0 /dev/fd0 /mnt/floppy auto noauto,owner,kudzu 0 0
/dev/sdb5 /mnt/sdb5 ext3 defaults 0 0
[root@localhost root]# repquota -a
*** Report for user quotas on device /dev/sdb1
Block grace time: 7days; Inode grace time: 7days
Block limits File limits User used soft hard grace used soft hard grace
———————————————————————-
root — 20 0 0 2 0 0
redhat +- 1032 10 0 7days 9 0 9
#quotaoff /mnt/sdb1
#edquota ?u redhat 如果要永久用配额限制的话，可以手动编辑/etc/fstab 增加：
/dev/sdb1 /mnt/sb1 ext3 defaults,usrquota,grpquota 0 0
保存退出！
取消磁盘配额的方法：
1）、使用命令quotaoff ?a 关闭对应磁盘分区上的配额文件 2）、可编辑/etc/fstab文件 3）、删除/mnt/sd1目录下的aquota.usr、aquota.group两个数据库文件.
但要相信真诚的爱情，对爱情永远怀有单纯的向往。