Raid 1+0 ?


 
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Special Forums Hardware Filesystems, Disks and Memory Raid 1+0 ?
# 1  
Old 05-11-2006
Raid 1+0 ?

My cutomer wants to set up a OS/apps server with two 72GB drives
configured with RAID 1+0. The way I understand RAID 1+0 is
that if there was a drive failure the whole OS/apps is lost because you
actually need at least 4 drives to set up a RAID 1+0 by splitting
them up into two arrays. Am I right or am I wrong?

Thanks.
# 2  
Old 05-12-2006
I think that you are right. Raid 1+0 will be a stripe of mirrors. So you carry out mirroring for the two disks and you need atleast two more disks to carry out the striping. Here's a link that discusses Raid 1+0 versus Raid 0+1. Also check this page. Says very clearly that Raid 1+0 requires a min of four disks to implement.
# 3  
Old 05-12-2006
Yes you need 4 disks at a minimum, but no, the loss of a single disk should not take the shebang down. Not even for raid 0+1. And certainly not for raid 1+0.

With only 2 drives, you really can't do raid 0+1 or raid 1+0, unless you take the view that each drive counts as a striped array with a 72 GB wide stripe. So then you simply mirror the drives and then the loss of one drive is still not a system killer.
# 4  
Old 05-12-2006
What Perderabo said, although I disagree with calling a sigle disk a stripe.

In a two disk 1+0 each disk would be a single disk concatenation, rather than a single disk stripe, it is a little pedantic to make the destinction with only two disks, but the difference only becomes apparrent when adding extra disk to the setup.
# 5  
Old 05-12-2006
Thanks guys. This reassures my logic and hopefully the
customer will go with 4 drives instead of two.
But as stated they probably could go with just 2 drives but lose
the true effect of the stripping and increased redundancy.
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