MegaRaid Lies

Dell PowerEdge 1850. I’ve never seen it in the flesh, but believe it has a MegaRAID card.

# lsscsi
[0:0:6:0]    process PE/PV    1×2 SCSI BP      1.0   -
[0:1:0:0]    disk    MegaRAID LD 0 RAID1   69G 516A  /dev/sda
# grep -i raid /var/log/dmesg
[   20.251664] megaraid cmm: 2.20.2.7 (Release Date: Sun Jul 16 00:01:03 EST 2006)
[   20.690899] megaraid: 2.20.5.1 (Release Date: Thu Nov 16 15:32:35 EST 2006)
[   20.690929] megaraid: probe new device 0×1028:0×0013:0×1028:0x016c: bus 2:slot 14:func 0
[   20.690964] megaraid 0000:02:0e.0: PCI INT A -> GSI 46 (level, low) -> IRQ 46
[   21.324054] megaraid: fw version:[516A] bios version:[H418]
[   21.332182] scsi0 : LSI Logic MegaRAID driver
[   21.332598] scsi[0]: scanning scsi channel 0 [Phy 0] for non-raid devices
[   24.821907] scsi 0:1:0:0: Direct-Access     MegaRAID LD 0 RAID1   69G 516A PQ: 0 ANSI: 2

Seems fine, right?

# ./MegaCli64 -adpCount
Controller Count: 0.
Exit Code: 0×00

Hrm.

/opt/MegaRAID/MegaCli # omreport storage controller
No controllers found

Starting to get tweaky.

Update

Thanks to jtopper for the help so far. Getting a bit further, but still:

wget http://www.lsi.com/DistributionSystem/AssetDocument/files/support/rsa/utilities/megaconf/ut_linux_megarc_1.11.zip
unzip ut_linux_megarc_1.11.zip
sudo ./megarc.bin -AllAdpInfo
        Failed to get driver version
        No Adapters Found

And…

$ grep MAJOR megarc
MAJOR=`grep megadev /proc/devices|awk ‘{print $1}’`
$ grep -ci mega /proc/devices
0

Further Update

I’ve finally managed to get to the bottom of this. Looks like any app which creates the /dev/megadev0 device does it with the wrong major. To fix this, based on some brilliant info, I used a major of 10 (now that 252 is used for usbmon), and a minor from /proc/misc.

# mknod /dev/megadev0 c 10 59
# ./megarc -dispCfg -a0
        **********************************************************************
              MEGARC MegaRAID Configuration Utility(LINUX)-1.11(12-07-2004)
              By LSI Logic Corp.,USA
        **********************************************************************
          [Note: For SATA-2, 4 and 6 channel controllers, please specify
          Ch=0 Id=0..15 for specifying physical drive(Ch=channel, Id=Target)]
        Type ? as command line arg for help
        Finding Devices On Each MegaRAID Adapter…
        Scanning Ha 0, Chnl 0 Target 15
        **********************************************************************
              Existing Logical Drive Information
              By LSI Logic Corp.,USA
        **********************************************************************
          [Note: For SATA-2, 4 and 6 channel controllers, please specify
          Ch=0 Id=0..15 for specifying physical drive(Ch=channel, Id=Target)]
          Logical Drive : 0( Adapter: 0 ):  Status: OPTIMAL
        —————————————————————————-
        SpanDepth :01     RaidLevel: 1  RdAhead : Adaptive  Cache: DirectIo
        StripSz   :064KB   Stripes  : 2  WrPolicy: WriteBack
        Logical Drive 0 : SpanLevel_0 Disks
        Chnl  Target  StartBlock   Blocks      Physical Target Status
        ——  ———  —————   ———      ———————————
        0      00    0×00000000   0x0887c000   ONLINE
        0      01    0×00000000   0x0887c000   ONLINE

Hope this helps someone, and many thanks to these guys.