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meulie
l33t
Joined: 17 Jun 2003
Posts: 845
Location: a Dutchman living in Norway
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 Posted: Sun Aug 17, 2008 5:47 am Post subject: Partitions on a partition? |
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Hi all,
Just for fun I tried partitioning a raid partition, /dev/md0. This seems to work:
| Code: | fdisk -l /dev/md0
Disk /dev/md0: 10.7 GB, 10737287168 bytes
2 heads, 4 sectors/track, 2621408 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk identifier: 0xc75bf1c1
Device Boot Start End Blocks Id System
/dev/md0p1 1 1220704 4882814 83 Linux
/dev/md0p2 1220705 2621408 5602816 83 Linux |
However, when I then try to format one, it doesn't exist?
| Code: | mke2fs /dev/md0p1
mke2fs 1.40.9 (27-Apr-2008)
Could not stat /dev/md0p1 --- No such file or directory
The device apparently does not exist; did you specify it correctly? |
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Greetz,
Evert Meulie |
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Jointy
Tux's lil' helper
Joined: 23 Dec 2005
Posts: 142
Location: Saarbrücken
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| Posted: Sun Aug 17, 2008 11:31 am Post subject: |
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Hi,
what does an "mdadm --detail --scan /dev/md0" say.
| Code: |
pandora ~ # mdadm --detail --scan /dev/md0
/dev/md0:
Version : 00.90.03
Creation Time : Mon Jul 7 15:10:27 2008
Raid Level : raid1
Array Size : 58613056 (55.90 GiB 60.02 GB)
Used Dev Size : 58613056 (55.90 GiB 60.02 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Sun Aug 17 11:45:49 2008
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : b16e8306:2d6c8eb3:814001e4:9408904d
Events : 0.26
Number Major Minor RaidDevice State
0 3 65 0 active sync /dev/hdb1
1 22 65 1 active sync /dev/hdd1
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or try "cat /proc/mdstat"
But by the way I never saw that someone create not directly the partition on the raid. Maybe that doesn't work.
http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID
or
http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID_mirror_and_LVM2_on_top_of_RAID
j0inty
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NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54809
Location: 56N 3W
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| Posted: Sun Aug 17, 2008 11:50 am Post subject: |
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meulie,
The space for the MBR exists on /dev/md... but the kernel does not allocate any device major/minor numbers for partitions on md raid sets, so there are no /dev entries for them.
Look in /usr/src/linux/Documentation/devices.txt
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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