Software raid? mdadm?

[lewinb]

I can't find any info on the daughterboard that the drives connect to, so can someone verify that it is not a raid controller?

If so, then can someone shed some light on how the n2100 actually creates the raid? Does it use mdadm? Mdadm is installed.

I see /dev/hda-d and sda-I (what the heck??) as well as md0-4

I'm not versed enough in linux RAID to know why those are all listed, instead of just sda-b and md0.

ALSO, if raid is indeed constructed by mdadm, does anyone know where I can find the script or .conf file that it uses to build them?

[wengi]

Hi,

has been some time we discussed this.

It IS mdadm:~# mdadm --detail /dev/md0
/dev/md0:
       Version : 00.90.01
 Creation Time : Tue Jul 10 12:27:41 2007
    Raid Level : raid1
    Array Size : 242685824 (231.44 GiB 248.51 GB)
   Device Size : 242685824 (231.44 GiB 248.51 GB)
  Raid Devices : 2
 Total Devices : 2
Preferred Minor : 0
   Persistence : Superblock is persistent

   Update Time : Fri Jun 26 05:01:17 2009
         State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
 Spare Devices : 0

          UUID : 3c223e65:38fbd2ee:6fac29b4:074f6f72
        Events : 0.131461

   Number   Major   Minor   RaidDevice State
      0       8        2        0      active sync   /dev/sda2
      1       8       18        1      active sync   /dev/sdb2

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wengi

[lewinb]

Thanks for the response.
Wow... I can't believe I didn't find that as I searched! I had forgot about the outcome of that. I was sure it was mdadm, but was led to believe it may not be by the results of my current project.
Here's my current project:
I'm wanting to move the existing array to another computer. In this case, a Dell Poweredge 700 server, running Ubuntu 9.04 (Jaunty).

Under the assumption that it was a software raid, built by mdadm, I took the two drives, and plugged them into the 2 intergrated SATA ports. The individual devices are recognized in gparted as sda and sdb, along with partitions 1-3.

However, this happens:
Poweredge:~$ sudo mdadm --assemble --scan
mdadm: No arrays found in config file or automatically

THAT is what led me to question that it was created by mdadm.

If someone could weigh in on the rest of this problem, here, or at ubuntuforums.org/showthread.php?p=7519604#post7519604, I will make a new thread with instructions for anyone else who wants to do this.