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@xxxxxxx>
> "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
/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
Dennis
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