Re: RAID 0 of Two RAID 5s Stays Up When Component RAID fails

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On Mar 13, 2013, at 10:03 PM, Joel Young <jdy@xxxxxxxxxxxxxxx> wrote:

> Joel Young <jdy <at> cryregarder.com> writes:
>> mdadm /dev/md0 --fail /dev/loop0
>> mdadm /dev/md0 --fail /dev/loop1
> 
> That is a typo.  It is:
> 
> mdadm /dev/md0 --fail /dev/loop1
> mdadm /dev/md0 --fail /dev/loop2

In this case md0 is failed. And thus md2 is failed.

> dd if=/dev/zero of=/dev/md2 bs=1M

The block device is expected to still be there, I'm not sure what errors you should get, but if it were a real physical block device than a logical one, I'd expect there'd be messages in dmesg.

If you had a mounted file system you were trying to write to I think you'd get more immediate error messages in the shell, not just in dmesg.


Chris--
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