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Old 12-17-2010, 03:20 PM   #1
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Registered: Mar 2010
Posts: 5

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Slackware Raid 1 - Does not start automatically

Good evening,
I have a server setup with software raid, I've used mdadm to create the mirror and it seems to be working just fine but it won't start by itself.

2 x 160GB SATA drives, each with a single partition

/dev/sdb1 and /dev/sdc1 respectively

        Version : 0.90
  Creation Time : Fri Dec 17 13:31:13 2010
     Raid Level : raid1
     Array Size : 156288256 (149.05 GiB 160.04 GB)
  Used Dev Size : 156288256 (149.05 GiB 160.04 GB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Fri Dec 17 17:00:36 2010
          State : clean
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : bfc4e0d9:78b0e886:9cfafa2f:27ccc2a8
         Events : 0.38

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       33        1      active sync   /dev/sdc1
The problem is that it doesn't start at boot until I run

mdadm -A /dev/md0 /dev/sdb1 /dev/sdc1

What am I missing to get the raid to start at boot time?

Old 12-17-2010, 04:13 PM   #2
Slackware Contributor
Registered: Jun 2002
Location: New Zealand
Distribution: Slackware
Posts: 999

Rep: Reputation: 229Reputation: 229Reputation: 229
Try creating and using an initrd.

Also you'll need your Raid partitions to be set as FD (Raid Autodetect.
1 members found this post helpful.
Old 12-17-2010, 05:58 PM   #3
Registered: Aug 2006
Distribution: Slackware
Posts: 804

Rep: Reputation: 110Reputation: 110
Do you have a /etc/mdadm.conf? You need all your arrays in there too a la:
mdadm -Es > /etc/mdadm.conf
As mRgOBLIN said, use an initrd and make sure you have any modules related to your disk controller in there.
Old 12-17-2010, 11:17 PM   #4
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Registered: Mar 2010
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Thanks for the help.

I changed the partition type to FD and they came right up at boot.



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