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I have four identical SATA disks and want to create a Software RAID 10 |
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array for my new gentoo system. But I am quite a newbie for the RAID |
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area. I googled but found nothing teach me how to setup a RAID10 on |
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four disks -- all the tutorials, howto, etc. are talking about setup |
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RAID1 or RAID0 or mix these two up on two disks. |
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|
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I fdisk all my four disks to the following: |
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|
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livecd ~ # sfdisk -d /dev/sda |
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# partition table of /dev/sda |
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unit: sectors |
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|
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/dev/sda1 : start= 63, size= 144522, Id=fd |
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/dev/sda2 : start= 144585, size= 1975995, Id=82 |
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/dev/sda3 : start= 2120580, size= 39086145, Id=fd |
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/dev/sda4 : start= 41206725, size=115089660, Id=fd |
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|
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/dev/sdb, /dev/sdc and /dev/sdd are all fdisk'ed as the same as /dev/sda. |
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|
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As grub cannot be setup on RAID0 (neither RAID 1+0 nor RAID 0+1), I have |
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to create a four-partion RAID1 with /dev/sd[abcd]1 and mount it as /boot. |
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|
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Then I want both my / and /var are RAID10. I use the following schema: |
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|
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/dev/sda3 /dev/sdb3 /dev/sdc3 /dev/sdd3 |
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| | | | |
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+--(RAID1)---+ +---(RAID1)--+ |
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/dev/md3 /dev/md4 |
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| | |
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+---------(RAID0)----------+ |
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| |
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/dev/md5 |
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|
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and mount /dev/md5 as /. The same as /dev/sd[abcd]4 for a /dev/md8 as /var. |
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|
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After mkraid, I followed the Gentoo Handbook and installed system, build |
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all RAID and driver mapping options into kernel. But after reboot, |
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kernel panic! The error message says it can not mount / on /dev/md5 |
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because it doesn't exist. |
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|
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>From the messages on the boot screen, it seems the kernel can assemble |
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the two RAID1's and create /dev/md3 and /dev/md4, but it can not |
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assemble /dev/md5. Maybe because /dev/md5 is based on two md devices? |
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|
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I tried RAID1 on two RAID0's but with no luck, either. |
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|
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How can I create a system which root partion is RAID10? |
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|
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-- |
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Qiangning Hong |
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http://www.hn.org/hongqn (RSS: http://feeds.feedburner.com/hongqn) |
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|
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Registered Linux User #396996 |
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Get Firefox! <http://www.spreadfirefox.com/?q=affiliates&id=67907&t=1> |
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Thunderbird! <http://www.spreadfirefox.com/?q=affiliates&id=67907&t=183> |
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-- |
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