Dan Stromberg a écrit :

On Fri, 2005-06-10 at 09:11 +0200, Laurent CARON wrote:
 

quoted

Dan Stromberg a écrit :

   

quoted

Has anyone constructed a RAID 5 of RAID 5's using mdadm on a linux
system?

Was it reliable?

How large was it?

Thanks!



     

Seems to be a large waste of space....
   

Consider:

You have a bunch of "bricks" that can shuffle data between a NAS head
and a bunch of disks.

The disks are RAID'd (through the "bricks"), but if one of the bricks
themselves dies, you're kinda stuck.

But if you RAID 5 the RAID 5's, then you don't end up with massive
parity pounding, and your bricks aren't a single point of failure, and
you don't lose as much space as if you mirrored.

Sound copacetic?

Thanks for your feedback!

 

RAID 10 is IMHO a bit more efficient.

Raid 5 means at least 9 disks:
Usable capacity: 4 Disks
Read speed: Good
Write speed: poor

Raid 10 with 8 disks can store the same amount of data.
Read speed: Average
Write Speed: Better than raid5


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