[CentOS] Re: Raid5 issues

Thu May 3 18:37:34 UTC 2007
David A. Woyciesjes <david.woyciesjes at yale.edu>

Toby Bluhm wrote:
> Russ wrote:
>> ...
>> I would like to set up raid 10 instead, but it doesn't seem like its 
>> supported by my mdadm - the proper personalities are not loaded.  How 
>> do I get the raid10 personality in there? 

> I don't believe there's a raid10 personality. What you would do is build 
> your 2 stripe sets, then mirror those striped md's...

	Actually, you have it backwards. Build 2 separate mirror sets, then 
make a stripe set of those 2 mirrors.
	Here's why: In your setup, if one drive fails, that whole stripe set is 
down for the count. You're then running on only 2 drives, no redundancy. 
The other way, if one drive goes, the other drive in that mirror set 
keeps going; you're still using 3 drives.
	Hopefully I explained it clearly... :)


-- 
--- David Woyciesjes