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Re: fc10 and raid-10

On Saturday 27 September 2008 09:32:27 pm Bill Davidsen wrote:
> The Fedora installer has insisted on requiring four drives for raid-10
> install, and then not using raid-10, but rather raid-1+0 which is *NOT* the
> same thing. Any hope that this could be fixed in fc10, as it is a real PITA
> to fight a way around it and get a proper raid configured.
> This is a real performance issue, see linux-raid discussion in archives
> about this.
> --
> Bill Davidsen <davidsen tmr com>
>    "We have more to fear from the bungling of the incompetent than from
> the machinations of the wicked."  - from Slashdot
Raid 10 requires at least 4 drives. and then it needs even numbers of disks to 
grow.  so you could do 4,6,8,10,12  etc.  an odd disk is should only be used 
as a hot spare.  otherwise it would cause degregation to the array

md1 : active raid10 sda2[0] sdd2[3] sdc2[2] sdb2[1]
      624623104 blocks 256K chunks 2 near-copies [4/4] [UUUU]

looks like its right to me.  this box was installed F-8  and was yum updated 
to rawhide.    my box with raid 10 is using the raid 10 module.  i have 
4x320gb drives and get great performance out of the array.

hdparm -tT /dev/md1

 Timing cached reads:   4868 MB in  1.99 seconds = 2441.54 MB/sec
 Timing buffered disk reads:  256 MB in  3.02 seconds =  84.75 MB/sec


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