I have four identical SATA disks and want to create a Software RAID 10
array for my new gentoo system. But I am quite a newbie for the RAID
area. I googled but found nothing teach me how to setup a RAID10 on
four disks -- all the tutorials, howto, etc. are talking about setup
RAID1 or RAID0 or mix these two up on two disks.
I fdisk all my four disks to the following:
livecd ~ # sfdisk -d /dev/sda
# partition table of /dev/sda
unit: sectors
/dev/sda1 : start= 63, size= 144522, Id=fd
/dev/sda2 : start= 144585, size= 1975995, Id=82
/dev/sda3 : start= 2120580, size= 39086145, Id=fd
/dev/sda4 : start= 41206725, size=115089660, Id=fd
/dev/sdb, /dev/sdc and /dev/sdd are all fdisk'ed as the same as /dev/sda.
As grub cannot be setup on RAID0 (neither RAID 1+0 nor RAID 0+1), I have
to create a four-partion RAID1 with /dev/sd[abcd]1 and mount it as /boot.
Then I want both my / and /var are RAID10. I use the following schema:
/dev/sda3 /dev/sdb3 /dev/sdc3 /dev/sdd3
| | | |
+--(RAID1)---+ +---(RAID1)--+
| |
/dev/md3 /dev/md4
| |
+---------(RAID0)----------+
|
/dev/md5
and mount /dev/md5 as /. The same as /dev/sd[abcd]4 for a /dev/md8 as /var.
After mkraid, I followed the Gentoo Handbook and installed system, build
all RAID and driver mapping options into kernel. But after reboot,
kernel panic! The error message says it can not mount / on /dev/md5
because it doesn't exist.
>From the messages on the boot screen, it seems the kernel can assemble
the two RAID1's and create /dev/md3 and /dev/md4, but it can not
assemble /dev/md5. Maybe because /dev/md5 is based on two md devices?
I tried RAID1 on two RAID0's but with no luck, either.
How can I create a system which root partion is RAID10?
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Qiangning Hong
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Registered Linux User #396996
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