RAID1 on RAID0?

Chowroc

This is a problem about RAID0+1. I build 2 raid0: md2(sda3,sdb3), md3(sdc3,sdd3), then build a raid1 on raid0: md4(md2,md3).

Now it can work, and I can "mke2fs -j /dev/md4" and copy files to it. But now I found a problem by doing this:

1. 
   
2. # mount -t ext3 /dev/md4 /mnt
   
3. # cd /mnt
   
4. # cp /var -a ./VAR.TEST
   
5. # dd if=/dev/zero of=./raid1on0.md4 bs=1M count=100
   
6. # cd ..
   
7. [b]# mke2fs -j /dev/md2 [/b]
   

复制代码

NOW some files in /mnt become invalide. one time be some files and the next time may be some other files.

Could I do RAID0+1? or I have done something wrong?

How can I test the raid by "destroy"?

What about the real conditions while a hard disk is broken? How can I know a disk was broken?

Thanks.

hnull

Maybe you can change the raid level to 1+0
first 1
second 0?

Chowroc

要是先做1再做0就没有任何意义了，因为那样是不会提供任何冗余的。:=)