开始做的RAID5用三块相同容量硬盘，容量应该是其中两块硬盘的总容量。
后用mdadm -G /dev/md0 -n4 增加的一块硬盘
[root@localhost tmp]# mdadm -D /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Mon May 18 16:43:19 2009
Raid Level : raid5
Array Size : 3145536 (3.00 GiB 3.22 GB)
Device Size : 1048512 (1024.11 MiB 1073.68 MB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon May 18 17:43:37 2009
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : b6c7646a:d2ef118f:0f5aec86:bda29c7f
Events : 0.726
Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
2 8 32 2 active sync /dev/sdc
3 8 48 3 active sync /dev/sdd
而且容量也相应也增加了一块硬盘的容量，但是挂载后怎么容量没有增加呀？
[root@localhost tmp]# df -h
/dev/mapper/VolGroup00-LogVol00
6.7G 6.5G 0 100% /
/dev/hda1 99M 11M 83M 12% /boot
tmpfs 506M 0 506M 0% /dev/shm
/dev/md0 2.0G 33M 2.0G 2% /tmp/raid
请老师们指教！！
于 2013-07-29 17:09:15发表:
[root@centos5 raid]# mdadm -G /dev/md0 /dev/sde1
mdadm: can only add devices to linear arrays
[root@centos5 raid]# mdadm -G /dev/md0 -n4
mdadm: Need to backup 384K of critical section..
mdadm: /dev/md0: Cannot grow - need a spare or backup-file to backup critical se ction
[root@centos5 raid]# mdadm --manage /dev/md0 --add /dev/sde1
mdadm: added /dev/sde1
[root@centos5 raid]# mdadm --detail /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Mon Jul 29 16:14:05 2013
Raid Level : raid5
Array Size : 2088192 (2039.59 MiB 2138.31 MB)
Used Dev Size : 1044096 (1019.80 MiB 1069.15 MB)
Raid Devices : 3
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Mon Jul 29 16:23:53 2013
State : clean
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
UUID : 8f82dc00:ec080d5a:066fb317:6cf54f44
Events : 0.2
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
3 8 65 - spare /dev/sde1
mdadm --manage /dev/md0 --add /dev/sde1
mdadm -G /dev/md0 -n4
[root@centos5 ~]# resize2fs /dev/md0
resize2fs 1.39 (29-May-2006)
Filesystem at /dev/md0 is mounted on /raid; on-line resizing required
Performing an on-line resize of /dev/md0 to 783072 (4k) blocks.
The filesystem on /dev/md0 is now 783072 blocks long.
[root@centos5 ~]# df -h
文件系统 容量 已用 可用 已用% 挂载点
/dev/mapper/VolGroup00-LogVol00
7.7G 3.1G 4.3G 42% /
/dev/sda1 99M 13M 82M 14% /boot
tmpfs 502M 0 502M 0% /dev/shm
/dev/md0 3.0G 151M 2.7G 6% /raid
nextking90 于 2009-09-22 11:04:15发表:
谢了