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aerith
n00b
Joined: 28 Jul 2005
Posts: 18
Location: Chérence 95
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 Posted: Sat Jul 30, 2005 8:39 pm Post subject: [RAID] mkraid and /dev |
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Hi,
I want to create 3 raid for /, /usr and /home at the install of gentoo, on the live CD I do
format my 2 disks :
| Code: |
Disk /dev/sde: 74.3 GB, 74355769344 bytes
255 heads, 63 sectors/track, 9039 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sde1 1 124 995998+ 82 Linux swap / Solaris
/dev/sde2 125 248 996030 fd Linux raid autodetect
/dev/sde3 249 497 2000092+ fd Linux raid autodetect
/dev/sde4 498 9039 68613615 fd Linux raid autodetect
Disk /dev/sdf: 74.3 GB, 74355769344 bytes
255 heads, 63 sectors/track, 9039 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdf1 1 124 995998+ 82 Linux swap / Solaris
/dev/sdf2 125 248 996030 fd Linux raid autodetect
/dev/sdf3 249 497 2000092+ fd Linux raid autodetect
/dev/sdf4 498 9039 68613615 fd Linux raid autodetect
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load the moduls md, linear, raid0 and raid1 say in
http://fr.gentoo-wiki.com/HOWTO_Installation_de_Gentoo_avec_RAID
or
http://lea-linux.org/admin/admin_fs/raid.html
create /etc/raidtab
| Code: |
livecd root # cat /etc/raidtab
# /
raiddev /dev/md2
raid-level 0
nr-raid-disks 2
chunk-size 32
persistent-superblock 1
device /dev/sde2
raid-disk 0
device /dev/sdf2
raid-disk 1
# /usr
raiddev /dev/md3
raid-level 0
nr-raid-disks 2
chunk-size 32
persistent-superblock 1
device /dev/sde3
raid-disk 0
device /dev/sdf3
raid-disk 1
# /home
raiddev /dev/md4
raid-level 1
nr-raid-disks 2
chunk-size 64
persistent-superblock 1
device /dev/sde4
raid-disk 0
device /dev/sdf4
raid-disk 1
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but when I do mkraid
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livecd root # mkraid /dev/m
mapper mem misc mouse
livecd root # mkraid /dev/md2
cannot determine md version: no MD device file in /dev.
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I found this https://forums.gentoo.org/viewtopic-t-231850-highlight-raid+md.html
and try to mknod /dev/md2 b 9 0
but it dont work and I can't rebuild the kernel or reboot
thinks
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cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
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| Posted: Sat Jul 30, 2005 9:51 pm Post subject: |
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I would probably use the newer mdadm instead of the older raidtools.
mdadm offers a couple of advantages for lazy people (like me  ).
/etc/raidtab is not needed
device nodes are created for you (with the --auto option)
In your case, the commands would look like this.
| Code: | # mdadm --create /dev/md2 --auto=yes --chunk=32 --level=0 --raid-devices=2 /dev/sde2 /dev/sdf2
# mdadm --create /dev/md3 --auto=yes --chunk=32 --level=0 --raid-devices=2 /dev/sde3 /dev/sdf3
# mdadm --create /dev/md4 --auto=yes --level=1 --raid-devices=2 /dev/sde4 /dev/sdf4
# cat /proc/mdstat |
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aerith
n00b
Joined: 28 Jul 2005
Posts: 18
Location: Chérence 95
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| Posted: Sun Jul 31, 2005 7:45 pm Post subject: |
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that's good 
really thx
:*
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Installing Gentoo
