} -----Original Message-----
} From: [EMAIL PROTECTED] [mailto:linux-raid-
} [EMAIL PROTECTED] On Behalf Of Ruslan Sivak
} Sent: Friday, May 04, 2007 12:22 PM
} To: [email protected]
} Subject: raid10 on centos 5
}
} I am trying to set up raid 10 and so far with no luck. I have 4 drives,
} and Anaconda will not let me do raid 10. mdadm doesn't have the raid 10
} personality loaded. When I create the array manually like so:
}
} 2 drives in /dev/md11 as raid1
} 2 drives in /dev/md12 as raid1
} md11 and md12 in /dev/md10 as raid0
}
} Everything looks fine from the shell, but anaconda only sees md11 and
} md12.
}
} The only choice I see is to set up LVM over md11 and md12. Is this
} really raid10?
}
} Russ
You are making a RAID1+RAID0 array.
Try making a real RAID10 array with 4 drives. This way you would only have
1 array with 4 drives.
>From the mdadm man page:
Currently, Linux supports LINEAR md devices, RAID0 (striping), RAID1
(mirroring), RAID4, RAID5, RAID6, RAID10, MULTIPATH, and FAULTY.
Notice RAID10 is listed, use that. Man mdadm for more info.
However, I would (and do) use RAID6. With RAID6 any 2 disks can fail
without data loss. With RAID1+RAID0, any one disk can fail, a second
failure has a 1 in 3 chance of vast data loss.
I hope this helps,
Guy
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