change existing RAID10 to "far layout"

[Reindl Harald]

>> for better performance you could use RAID10 in the far layout instead (raid10,f2),
>> this is a direct replacement with the enhanced raid10 driver, which gives double
>> the sequential read speed compared to raid1. Use "--level=10 -p f2" as additional
>> parameters when creating arrays with mdadm.

hmm is there a way to change this in an existing RAID10?
i think i would like this for / where read-performance is much
more important and /dev/md2 is perfectly with near-layout
for write-performance (hughe data, virtual machines)
________________

[root at raid ~]# mdadm --grow  /dev/md1 --level=10 -p f2
mdadm: RAID10 can only be changed to RAID0
[root at raid ~]# mdadm --grow  /dev/md1 -p f2
mdadm: RAID10 can only be changed to RAID0
[root at raid ~]# mdadm --misc  /dev/md1 -p f2
mdadm: option -p not valid in misc mode
________________

md2 : active raid10 sdc3[0] sdd3[3] sda3[4] sdb3[5]
      3875222528 blocks super 1.1 512K chunks 2 near-copies [4/4] [UUUU]
      bitmap: 7/29 pages [28KB], 65536KB chunk

md1 : active raid10 sdc2[0] sdd2[3] sda2[4] sdb2[5]
      30716928 blocks super 1.1 512K chunks 2 near-copies [4/4] [UUUU]
      bitmap: 1/1 pages [4KB], 65536KB chunk

md0 : active raid1 sdc1[0] sdd1[3] sda1[4] sdb1[5]
      511988 blocks super 1.0 [4/4] [UUUU]

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