10:32:00

#ls -l

total 205008
-rw-r--r-- 1 root root 104857600 Feb 21 11:32 disk1.img
-rw-r--r-- 1 root root 104857600 Feb 21 11:22 disk2.img

10:32:12

#dd if=/dev/zero of=disk3.img count=100 bs=1024k

100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.2742 s, 382 MB/s

10:32:27

#losetup /dev/loop3 disk3.img

10:34:18

#mdadm /dev/md0 -r /dev/loop2

mdadm: hot removed /dev/loop2 from /dev/md0

10:34:30

#cat /proc/mdstat

Personalities : [raid1]
md0 : active raid1 loop1[0]
      102388 blocks super 1.2 [2/1] [U_]
unused devices: <none>

10:34:33

#mdadm /dev/md0 -a /dev/loop3

mdadm: added /dev/loop3

10:35:22

#ls -l disk*.img

-rw-r--r-- 1 root root 104857600 Feb 21 11:35 disk1.img
-rw-r--r-- 1 root root 104857600 Feb 21 11:22 disk2.img
-rw-r--r-- 1 root root 104857600 Feb 21 11:35 disk3.img

10:36:20

#ls /mnt/

file  lost+found

10:36:41

#cat /proc/mdstat

Personalities : [raid1]
md0 : active raid1 loop3[2] loop1[0]
      102388 blocks super 1.2 [2/2] [UU]
unused devices: <none>

11:02:26

#mdadm --stop /dev/md0

mdadm: failed to stop array /dev/md0: Device or resource busy
Perhaps a running process, mounted filesystem or active volume group?

11:02:30

#umount /mnt

11:02:36

#mdadm --stop /dev/md0

mdadm: stopped /dev/md0

11:02:37

#mdadm -C /dev/md0 -l 5 -n 3 /dev/loop1 /dev/loop2 /dev/loop3

mdadm: /dev/loop1 appears to contain an ext2fs file system
    size=102400K  mtime=Tue Feb 21 09:51:24 2012
mdadm: /dev/loop1 appears to be part of a raid array:
    level=raid1 devices=2 ctime=Tue Feb 21 10:44:52 2012
mdadm: partition table exists on /dev/loop1 but will be lost or
       meaningless after creating array
mdadm: /dev/loop2 appears to contain an ext2fs file system
    size=102400K  mtime=Tue Feb 21 09:51:24 2012
mdadm: /dev/loop2 appears to be part of a raid array:
    level=raid1 devices=2 ctime=Tue Feb 21 10:44:52 2012
mdadm: partition table exists on /dev/loop2 but will be lost or
       meaningless after creating array
mdadm: /dev/loop3 appears to be part of a raid array:
    level=raid1 devices=2 ctime=Tue Feb 21 10:44:52 2012
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md0 started.

11:04:11

100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.669148 s, 157 MB/s

11:04:44

#losetup /dev/loop4 disk4.img

11:05:01

#mdadm -G /dev/md0 -n 4

mdadm: Need to backup 3072K of critical section..
mdadm: /dev/md0: Cannot grow - need a spare or backup-file to backup critical section

11:07:51

#dd if=/dev/zero of=backup-file.img count=100 bs=1024k

100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.415717 s, 252 MB/s

11:08:10

#mdadm -G /dev/md0 --backup-file=backup-file.img -n 4

mdadm: Need to backup 3072K of critical section..
mdadm: /dev/md0: cannot create backup file backup-file.img: File exists

11:08:13

#rm backup-file.img

11:08:19

#mdadm -G /dev/md0 --backup-file=backup-file.img -n 4

mdadm: Need to backup 3072K of critical section..

11:08:20

#cat /proc/mdstat

Personalities : [raid1] [raid6] [raid5] [raid4]
md0 : active raid5 loop3[3] loop2[1] loop1[0]
      305664 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UUU_]
unused devices: <none>

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Вторник (02/21/12)