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Hi, I hope someone can help me with my software RAID problem. In a nutshell I can create /dev/md0 using either mkraid or mdadm. However I can't create /dev/md1 or ...
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- 05-14-2006 #1
- Join Date
- May 2006
Software RAID; can't create /dev/md1
I hope someone can help me with my software RAID problem. In a nutshell I can create /dev/md0 using either mkraid or mdadm. However I can't create /dev/md1 or /dev/md2. I'm told by both programs that there is no such file or directory. I've checked the syntax and parameters and can't find anything wrong.
The distribution is Mandrake Linux 2006. However, I downloaded the 126.96.36.199 kernel source and re-compiled it to include direct support for all the IDE controller cards, Reiserfs filesystem and RAID support. The modified kernel boots up OK.
I have three hard drives in the machine, each on a different IDE controller.
HDA is 120GB
HDE is 152GB
HDI is 149GB
I started the linux installation from scratch. Using Diskdrake, I configured the drives as per the following:
HDA = primary partition formatted Reiserfs for entire disk (114GB), [hda1]
HDE = primary partition formatted Reiserfs, 100MB, [hde1]
extended partition formatted Reiserfs, 114GB, [hde5]
extended partition formatted Reiserfs, 34GB, [hde6]
primary partition formatted native ext2, 3.6GB, root mount point, [hde4]
HDI = primary partition formatted Reiserfs, 100MB, [hdi1]
extented partition formatted Reiserfs, 114GB, [hdi5]
extended partition formatted Reiserfs, 34GB, [hdi6]
Note: I also tried the configuration where all partitions are primary and no extended partitions.
I installed the OS on to hde4 so that I didn't have to worry about it while I was creating the arrays. I plan to copy it over to /dev/md0 once everything is setup. Then I'll have two copies of the OS that I can boot to, one version on the RAID and another that isn't.
My aim is to create 3 RAID arrays:
/dev/md0 is a RAID 5 array using the 3 114GB partitions - hda1,hde5,hdi5. It will eventually have the OS and data files on it.
/dev/md1 is a RAID 1 array using the 2 100MB partitions - hde1, hdi1. It will store the modified boot kernel 188.8.131.52 so that LILO can see it.
/dev/md2 is a RAID 1 array using the remaining 34GB partitions - hde6, hdi6. I just wanted to make use of the remaining space on the drives.
All goes well up to the point of making the RAIDS. I'll reference mdadm but I've included /etc/raidtab at the end of the post as well. I start with /dev/md0:
mdadm -Cv /dev/md0 -l5 -n3 -c32 /dev/hda1 /dev/hde5 /dev/hdi5
This gets constructed without any problems.
Now for /dev/md1:
mdadm -Cv /dev/md1 -l1 -n2 -c32 /dev/hde1 /dev/hdi1
mdadm tells me that:
mdadm: error opening /dev/md1: No such file or directory
The story is the same for /dev/md2 and the response from mkraid.
Here's the /etc/raidtab
# md0 is the root array, about 240GB
# md1 is the boot kernel array, about 100MB
# md2 is a spare mirror, about 34GB
Your thoughts on this matter would be much appreciated. I'm either trying to do something that can't be done or I'm missing a step.
Thanks for your help.