[K12OSN] Linux "Software RAID"

[Almquist Burke]

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On Aug 9, 2008, at 4:05 PM, Terrell Prude' Jr. wrote:
> I use RAID 5 in 14-disk arrays at work.  We find the speed  
> excellent, and the savings in disk space is enormous.  Say you have  
> fourteen 500GB disks, be they SATA or SCSI.  With RAID 10, your  
> storage would be 14 disks * 500GB / 2, which is 3.5TB.  With RAID  
> 5, you'd have (14 disks - 1 for parity) * 500GB = 13 * 500GB =  
> 6.5TB.  I'll take the extra 3TB any day!
>
> --TP
>

This is true, although in an array that big you might consider RAID 6  
instead. RAID 5 cannot handle more that one disk failure at once.  
Whereas a RAID 10 with 14 disks could lose one disk in each pair and  
still not fail (up to 7 in this case). But like you said, the  
downside is lost disk space. It's just that disk space is so cheep  
these days, especially with LVM,  that I don't worry much about  
giving it up. A pair of 6 disk Raid 10 arrays in LVM would be pretty  
outstanding I think. 
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