/dev/sdxx is apparently in use by the system; will not make a filesystem here! 解决方法
在存储上共享了一个500G的空间,映射到Linux系统提供上,环境由2个节点组成。
一. 测试一: 直接mount
用fdisk 格式化之后如下:
[root@rac1 u01]# fdisk -l
……
Disk /dev/sdk: 536.8 GB, 536870912000 bytes
255 heads, 63 sectors/track, 65270cylinders
Units = cylinders of 16065 * 512 = 8225280bytes
Device Boot Start End BlocksId System
/dev/sdk1 1 65270524281243+ 83 Linux
……
[root@rac1u01]#
但是创建文件系统时报错:
[root@rac1 u01]# mkfs -t ext3 /dev/sdk1
mke2fs 1.39 (29-May-2006)
/dev/sdk1 isapparently in use by the system; will not make a filesystem here!
提示/dev/sdk1 正在被使用。 /dev/sdk1 正在被DM管理,所以我们创建文件系统时提示报错,我们手工的移除,就可以正常的创建文件系统,操作如下:
[root@rac1 u01]# dmsetup status
mpath2: 0 2097152 multipath 2 0 1 0 1 1 A 01 0 8:16 A 0
mpath11p1: 0 1048562487 linear
mpath9: 0 209715200 multipath 2 0 1 0 1 1 A0 1 0 8:128 A 0
mpath8: 0 629145600 multipath 2 0 1 0 1 1 A0 1 0 8:112 A 0
mpath7: 0 629145600 multipath 2 0 1 0 1 1 A0 1 0 8:96 A 0
mpath6: 0 2097152 multipath 2 0 1 0 1 1 A 01 0 8:80 A 0
mpath5: 0 2097152 multipath 2 0 1 0 1 1 A 01 0 8:64 A 0
mpath11: 0 1048576000 multipath 2 0 1 0 1 1A 0 1 0 8:160 A 0
mpath4: 0 2097152 multipath 2 0 1 0 1 1 A 01 0 8:48 A 0
mpath10: 0 209715200 multipath 2 0 1 0 1 1A 0 1 0 8:144 A 0
mpath3: 0 2097152 multipath 2 0 1 0 1 1 A 01 0 8:32 A 0
[root@rac1 u01]# dmsetup remove_all
[root@rac1 u01]# dmsetupstatus
[root@rac1 u01]# mkfs -text3 /dev/sdk1
65536000 inodes, 131070310 blocks
6553515 blocks (5.00%) reserved for thesuper user
Maximum filesystem blocks=4294967296
32768 blocks per group, 32768 fragments pergroup
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
Creating journal (32768 blocks): done
Writing superblocks and filesystemaccounting information: done
This filesystem will be automaticallychecked every 36 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@rac1 u01]# mount /dev/sdk1/u01/backup
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 996M 51M894M 6% /boot
/dev/sda4 145G 188M138G 1% /u01/dave
/dev/sdk1 493G 198M467G 1% /u01/backup
[root@rac2 mapper]# vi /etc/fstab
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts/dev/pts devpts gid=5,mode=620 0 0
LABEL=SWAP-sda2 swap swapdefaults 0 0
/dev/sdk1 /u01/backup ext3 defaults 0 0
Device Mapper主要包含内核空间的映射和用户空间的device mapper库及dmsetup工具.
二. 实验二: 使用Multipath
http://blog.csdn.net/tianlesoftware/article/details/5979061
[root@rac1 mapper]# /sbin/scsi_id -g -u -s/block/sdk
3690b11c00022bc0e000003e55105b786
[root@rac1 mapper]# vi /etc/multipath.conf
wwid3690b11c00022bc0e000003e55105b786
"/etc/multipath.conf" 177L, 4832Cwritten
[root@rac1 mapper]# service multipathdrestart
Stopping multipathd daemon: [ OK ]
Starting multipathd daemon: [ OK ]
[root@rac1 mapper]# cd /dev/mapper/
brw-rw---- 1 root disk253, 9 Feb 20 12:35 backup
brw-rw---- 1 root disk253, 10 Feb 20 12:35 backupp1
crw------- 1 root root 10, 60 Feb 20 12:35 control
brw-rw---- 1 root disk 253, 8 Feb 20 12:35 mpath10
brw-rw---- 1 root disk 253, 0 Feb 20 12:35 mpath2
brw-rw---- 1 root disk 253, 1 Feb 20 12:35 mpath3
brw-rw---- 1 root disk 253, 2 Feb 20 12:35 mpath4
brw-rw---- 1 root disk 253, 3 Feb 20 12:35 mpath5
brw-rw---- 1 root disk 253, 4 Feb 20 12:35 mpath6
brw-rw---- 1 root disk 253, 5 Feb 20 12:35 mpath7
brw-rw---- 1 root disk 253, 6 Feb 20 12:35 mpath8
brw-rw---- 1 root disk 253, 7 Feb 20 12:35 mpath9
[root@rac1 mapper]# mount/dev/mapper/backupp1 /u01/backup
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 996M 51M894M 6% /boot
/dev/sda4 145G 188M138G 1% /u01/dave
/dev/mapper/backupp1 493G198M 467G 1% /u01/backup
-rw-r--r-- 1 root root 0 Feb 20 12:57 bl
drwxr-xr-x 2 root root 4096 Feb 20 12:55 dave
-rw-r--r-- 1 root root 5 Feb 20 12:55 dvd
drwx------ 2 root root 16384 Feb 20 12:10lost+found
[root@rac1 backup]# touch orcl
[root@rac2 backup]# umount /u01/backup
umount: /u01/backup: device is busy
umount: /u01/backup: device is busy
[root@rac2 backup]# fuser -km /u01/backup
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 996M 51M894M 6% /boot
/dev/mapper/backupp1 493G198M 467G 1% /u01/backup
[root@rac2 ~]# umount /u01/backup
Filesystem Size Used Avail Use% Mounted on
/dev/sda1996M 51M894M 6% /boot
[root@rac2 ~]# mount /dev/mapper/backupp1 /u01/backup
-rw-r--r-- 1 root root 0 Feb 20 12:57 bl
drwxr-xr-x 2 root root 4096 Feb 20 12:55 dave
-rw-r--r-- 1 root root 5 Feb 20 12:55 dvd
drwx------ 2 root root 16384 Feb 20 12:10lost+found
-rw-r--r-- 1 root root 0 Feb 20 14:34 orcl
---------------------------------------------------------------------------------------
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