raid10 array size limit?

Ryan Langseth langseth at
Thu Jan 28 10:47:39 CST 2010

Sandro Possa wrote:
> Hi all, 
> So, I was about to order a r710, and asked for 6 disks of 1TB each, to 
> build a raid10 array with them. 
> The odd part is that my sales rep told me that he couldnt sell me this 
> config - 6x1TB disks in a raid10 array - because "the sum of all disks 
> in a raid10 can be greater than 3.6TB". He said it twice, so I'm 
> positive that he meant what he said. But, if I did a raid5, it was fine, 
> I could use all the disks.
> After some googling I found nothing that could lead me to this 
> information. Reading PERC 6/i and 6/E documentation I found nothing too.
> Do any of you ever heard about this? 

I am certain this is wrong, I have a r710 (and a 2950) with 1tb disks 
and raid 10 running right now.  What your sales rep may have meant was 
they cannot sell it with a RAID 10 config because they do not have a 
disk image big enough for that. We got ours with RAID 5 and rebuilt.

One other thing to note you cannot create more than one Virtual disk 
with raid10, so you will need to use GPT for partitioning.

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