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Am Mittwoch, 4. Januar 2012, 21:28:32 schrieb Jeff Cranmer: |
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> On Wed, 2012-01-04 at 14:39 +0100, Volker Armin Hemmann wrote: |
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> > Am Dienstag, 3. Januar 2012, 21:57:18 schrieb Jeff Cranmer: |
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> > > Hi all, |
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> > > |
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> > > I have recently built a new system, running Gentoo on a Sabertooth 990FX |
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> > > motherboard. The board has a raid controller on which I'm running a |
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> > > 120GB solid state drive for the OS (Raid 0) and a set of three 1.5TB |
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> > > drives which were previously running as a RAID5 array. |
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> > |
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> > no, it does not have a raid controller. It is bios raid. AKA fake raid. |
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> > You |
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> > will have less trouble if you stop using it. |
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> > |
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> > google for mdadm. There are some very nice howto's. |
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> |
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> Not sure I'd agree with you about the howtos being nice. They mostly |
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> deal with trying to boot from a RAID array (don't want that, as I have |
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> my OS on a non-RAID 120GB SSD). They're also contradictory, with some |
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> saying I need dmraid, and some saying not. Most seem to make no more |
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> than a passing nod towards genkernel. |
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the short one: |
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partition one disk with (c)fdisk. Use sfdisk to transfer the partition scheme |
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to the other disks. |
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run mdadm --create /dev/md0 level=whatever you want --raid- |
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devices=thenumberofdevices /dev/sdXY /dev/sdZY ... |
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mdadm --detail --scan >> /etc/mdadm.conf |
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done |
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> |
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> So, given that from the links that I've found, here's my starting set of |
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> questions. |
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> |
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> In /etc/genkernel.conf, which options do I need to enable. |
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> One guide suggested the following settings |
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> DMRAID="no" |
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> MDADM="yes" |
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> MDADM_CONFIG="/etc/mdadm.conf" |
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> MDADM_VER="3.1.4" |
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there is a reason why I never ever touch genkernel. |
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you should forget that crap. You don't need to copy around anything. If your |
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root is not on some fancy setup, you don't need initramfs. |
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Just make a nice kernel, put it in /boot. Done. |
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grub.conf: |
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kernel /vmlinuz root=/dev/sda1 nmi_watchdog=0 |
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and you are fine. |
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Have the raids assembled by a) kernel (in that case you have to tell mdadm |
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that on creation time, man mdadm is your friend) or by mdadm init script. |
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Don't use fakeraid. Set bios to ahci and be done with this. |
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the relevant part of Kernel config for example: |
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<*> RAID support |
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│ │ |
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│ │ [*] Autodetect RAID arrays during |
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kernel boot │ │ |
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│ │ < > Linear (append) mode |
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│ │ |
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│ │ < > RAID-0 (striping) mode |
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│ │ |
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│ │ <*> RAID-1 (mirroring) mode |
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│ │ |
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│ │ < > RAID-10 (mirrored striping) mode |
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│ │ |
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│ │ <*> RAID-4/RAID-5/RAID-6 mode |
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│ │ |
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│ │ [ ] RAID-4/RAID-5/RAID-6 Multicore |
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processing (EXPERIMENTAL) │ │ |
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│ │ < > Multipath I/O support |
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│ │ |
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│ │ < > Faulty test module for MD |
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│ │ |
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│ │ < > Device mapper support |
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│ │ |
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│ │ |
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│ │ |
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│ │ |
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as you can see no dm support in my kernel. |
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No look what I got... |
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|
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cat /proc/mdstat |
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Personalities : [raid1] [raid6] [raid5] [raid4] |
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md5 : active raid1 sdg2[2] sdf2[1] |
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830278202 blocks super 1.2 [2/2] [UU] |
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md4 : active raid1 sdf1[1] sdg1[2] |
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146479542 blocks super 1.2 [2/2] [UU] |
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md124 : active raid1 sdc1[2] sdd1[1] sdb1[0] |
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64128 blocks [3/3] [UUU] |
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md1 : active raid5 sdc3[2] sdd3[1] sdb3[0] |
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78123904 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] |
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md2 : active raid5 sdc5[2] sdd5[1] sdb5[0] |
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39069824 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] |
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md127 : active raid5 sdc6[2] sdd6[1] sdb6[0] |
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843813888 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU] |
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the numbers where once nicely 0-4 but some update fucked that up. No big deal |
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- I mount by UUID. Something I strongly recommend. |
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-- |
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#163933 |
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