why you zeroing hdd ?  should you clear sdd?

On 10/26/07, Greg Cormier [off-list ref] wrote:

Can someone help me understand superblocks and MD a little bit?

I've got a raid5 array with 3 disks - sdb1, sdc1, sdd1.

--examine on these 3 drives shows correct information.


However, if I also examine the raw disk devices, sdb and sdd, they
also appear to have superblocks with some semi valid looking
information. sdc has no superblock.

How can I clear these? If I unmount my raid, stop md0, it won't clear it.

[root@zeus ~]# mdadm --zero-superblock /dev/hdd
mdadm: Couldn't open /dev/hdd for write - not zeroing

I'd like to rule out these oddities before I start on my next
troubleshooting of why my array rebuilds every time I reboot :)

Thanks,
Greg
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-- 
Raz