CentOS: trouble setting up a RAID

[cjtemple]

I am working on building a file server to store all of my movies so that I can pull them up on my different machines using Boxee. I have (3) 1Tb drives attached to a SATA controller and I want to setup a software RAID 0.
Here is what I have done thus far:
created a /etc/raidtab

raiddev /dev/md0
             raid-level          0
             nr-raid-disks     3
             persistent-superblock   1
             chunk-size        4
             device               /dev/sdb
             raid-disk           0
             device               /dev/sdc
             raid-disk           1
             device               /dev/sdd
             raid-disk           2

*** device /dev/sda is my main boot drive which is a 250Gb SATA drive connected straight to the motherboard***
I then used mdadm to create the array

mdadm --create /dev/md0 --level=0 --raid-devices=3 /dev/sdb /dev/sdc /dev/sdd

I created a mdadm.conf file at /etc/mdadm/mdadm.conf and used mdadm -Es to add the new RAID

mdadm -Es | grep md0  >>/etc/mdadm/mdadm.conf

next I formated the new device with mke2fs

mke2fs -j /dev/md0

I created a directory off of root for the files and mounted the device

mkdir /videos
mount /dev/md0 /videos

Finally I added it to my fstab

/dev/md0      /videos      ext2       defaults    0  0

When I reboot the machine fails to mount the device when I run cat /proc/mdstat the raid device is no longer running.

I am not sure where I am messing things up, can anyone point me in a direction?

[coopstah13]

i'd recommend against raid0, since when a drive will fail you will lose all data and this isn't any fun, i would just mount each drive individually under one directory like videos/drive1,2,3 instead

perhaps if you'd like to have one big thing you can look into LVM, though I'm not sure if that would have the same problem when a drive fails

[cjtemple]

Well I would have liked to get it running as a RAID 0 but I think due to time constraints I'll go ahead and use each drive separatly. My 250Gb drive in my windows machine that is currently holding my videos is running a little short on space. So I'll split it up as such.
/dev/sdb /videos/new
/dev/sdc /videos/viewed
/dev/sdd /videos/temp

I guess I can do everything by just doing the last couple of steps and useing the sd's instead of the md.

[imtiaz]

after creating the RAID, you need to save the raid info in mdadm.conf so that it starts automatically after reboot.

mdadm --detail --scan >> /etc/mdadm.conf

Now, you raid should come up after reboot