RAID10 not working in install

[Mike Wright]

Bill Davidsen wrote:
> Alan Cox wrote:
> 
>>> The raw read speed on a RAID1 array is the speed of a single drive. 
>>> The     
>>
>>
>> No. A smart raid1 driver will use both source disks. The raw write speed
>> is that of the slowest drive (plus overhead).
>>
>>   
> 
> Does this mean that the Linux software RAID is not smart, or there's a 
> way to make it actually do this?  Current FC[678] doesn't seem to be 
> "smart."
> 
>> RAID 10 gives you better write throughput which on a modern PC normally
>> means that with PCI Express your bridge/memory bandwidth becomes the
>> limit.
>>
>>   
> 
> This is what I measure running an E6600 CPU and 3xSeagate 320 with 
> Recent FC7 kernel. All reads and writes to the raw array using dd, 1MB 
> buffer, 1GB i/o to/from /dev/{zero,null} for raw speed. Units are MB/s, 
> 64k chunks, speed as reported by dd.
> 
> RAID lvl        read        write
> 0               110         143
> 1                52.1        49.5
> 10               79.6        76.3
> 10f2            145          64.5
> raw one disk     53.5        54.7

Sorry to butt in but what does 10f2 mean/stand for?

tia, :m)