I have OpenFiler storage server.

Without installing Windows and MSM, I want to create raid10 array from disks 2 to 21.

I have already successfully installed MegaCli to OpenFiler but I'm stuck in figuring out the correct command line for creating a raid 10 array.

The documentations says that the syntax for creating a raid 10 is:

MegaCli -CfgSpanAdd -r10 -Array0[E:S,E:S] -Array1[E:S,E:S] -aN

My enclosure ID is 25, so:

[root@linux-h5ut ~]# MegaCli -CfgSpanAdd -r10 -Array0[E25:S02,E25:S21] -Array1[E25:S02,E25:S21] WB Cached NoCachedBadBBU -a0
Invalid input at or near token E

I have googled high and low but there doesn't seem to be any example doing raid10 with megaraid (only the syntax).

Can anyone explain what is wrong?

6 Answers 6


Response a Create Raid 10 (not Raid 6)

  1. First get the Adapter #

    # MegaCli Adpallinfo -aall | grep '^Adapter'  
    Adapter #0   

    MegaCli or megacli depending distro *nix

    In this case Adapter it's Adapter #0

  2. Get Device ID and Slot disk values:

     # MegaCli64 -PDlist -aall | grep -e '^Enclosure Device ID:' -e '^Slot Number:'
     Enclosure Device ID: 252
     Slot Number: 0
     Enclosure Device ID: 252
     Slot Number: 1
     Enclosure Device ID: 252
     Slot Number: 2
     Enclosure Device ID: 252
     Slot Number: 3

    ID in this case for all it's 252

  3. According MegaCli command for create RAID 10 it's MegaCli -CfgSpanAdd -r10 -Array0[E:S,E:S] -Array1[E:S,E:S] -aN

    MegaCli -CfgSpanAdd -R10 -Array0[252:0,252:2] -Array1[252:1,252:3] -a0

    In this case, create a RAID 10, creating one array for Raid1 with disk 0 and 2, and other array for Raid1 with disks 1 and 3 and N = 0 (-a0)

  4. Verify RAID

     # megasasctl
     a0       LSI MegaRAID SAS 9271-4i encl:1 ldrv:1  batt:FAULT, low voltage, charge failed
     a0d0      1489GiB RAID 10  2x2  optimal
     a0e252s0    745GiB  a0d0  online
     a0e252s1    745GiB  a0d0  online
     a0e252s2    745GiB  a0d0  online
     a0e252s3    745GiB  a0d0  online

    Or if megasasctl is unavailable:

     # MegaCli -LDInfo -Lall -aALL
     Adapter 0 -- Virtual Drive Information:
     Virtual Disk: 0 (Target Id: 0)
     RAID Level: Primary-1, Secondary-0, RAID Level Qualifier-0
     Size:1.454 TB
     State: Optimal
     Stripe Size: 256 KB
     Number Of Drives per span:2
     Span Depth:2
     Default Cache Policy: WriteBack, ReadAhead, Direct, No Write Cache if Bad BBU
     Current Cache Policy: WriteBack, ReadAhead, Direct, No Write Cache if Bad BBU
     Access Policy: Read/Write
     Disk Cache Policy: Enabled
     Encryption Type: None

You didn't understand the man page. E25:S02 - its like variable which should have int values. All you need:

1.Get adapter ID (it's 0 in my example):

root@sto# megacli Adpallinfo -aall | grep '^Adapter'                                                    
Adapter #0

2. Get E and S values:

megacli -PDlist -aall | grep -e '^Enclosure Device ID:' -e '^Slot Number:'

You will get something like this:

Enclosure Device ID: 20
Slot Number: 0
Enclosure Device ID: 20
Slot Number: 1
Enclosure Device ID: 20
Slot Number: 2
Enclosure Device ID: 20
Slot Number: 3
Enclosure Device ID: 20
Slot Number: 4

This is you E and S numbers, i.g. 20:0,20:1,20:2,20:3,20:4 So the command to create for example RAID6, will be:

megacli -CfgLdAdd -r6 [20:0,20:1,20:2,20:3,20:4] -a0
  • This is the most correct (if not simply the most direct) answer.
    – Spooler
    Sep 22, 2016 at 21:53
  • These may be good instructions for RAID 6, but the OP indicated he wanted to build RAID 10.
    – bschlueter
    Feb 6, 2017 at 17:55

I used that (couple months ago to create raid 50):

megacli -CfgSpanAdd -r50 -Array0[252:2,252:3,252:4] Array1[252:5,252:6,252:7] WB RA Direct CachedBadBBU -a0

IBM x3560 and:

Product Name    : ServeRAID M5015 SAS/SATA Controller
Serial No       : SV14018726
FW Package Build: 12.13.0-0179

I just created a 6-disk RAID-10 with MegaCli, and used the following commands:

(Assuming there is only one controller in these examples, so that -aALL can be used instead of specifying a particular controller.)

Show the physical drives attached to the controller:

MegaCli -PDList -aALL

Note the "Enclosure Device ID" and "slot number" for the drives from this list as these are the numbers you replace "E" and "S" with, respectively, in the later raid-set creation commands.

Show the existing logical drives (i.e. RAID sets):

MegaCli -LDInfo -Lall -aALL

If you have an existing RAID array which you are going to re-use disks from then you need to remove the existing logical drive which those disks are part of. The logical drive number should be obtained from the previous command. Obviously this will destroy the data on this existing RAID array if you run it:

MegaCli -CfgLdDel -L<n> -aALL

Now you have a bunch of disks which should be in the "Unconfigured(good)" state and hence are available for use in a new logical drive. Lets create a RAID-10 set of 6-disks, which is really a span of 3 RAID-1 pairs of disks:

MegaCli -CfgSpanAdd -r10 -Array0[32:2,32:3] -Array1[32:4,32:5] -Array2[32:6,32:7] -a0

In my case the disks are disks 2 to 7 on enclosure 32. These numbers are obtained from the PDList output you got earlier. If you have 4 disks then it's just two pairs, but the "ArrayN" chunks are always pairs as the underlying RAID-1 pairs in a RAID-10 set.

Your RAID array should now show up to your OS and be available for partitioning etc from there! :)


Seems that I should not use E and S letters.

At first I understood correctly and tried it letterlessly but also got invalid token errors because I was using -aALL instead of -a0 ("If you have only one controller it’s safe to use ALL instead of a specific ID"), and then read from this site that "E is the enclosure device ID in which the drive resides and S the slot number" and hence concluded that I should replace E and S with actual IDs. :(

  • But nevertheless, without E and S letters, megaraid responds with "OSSpecificInitialize: Failed to load libsysfs.so.2.0.2 Please ensure that libsfs is present in the system. The dependent library libsysfs.so.2.0.1 not available. Please contact LSI for distribution of the package Mix of configured and unconfigured drives are not possible.". I guess I have to get this library somehow.
    – Henno
    Jul 1, 2013 at 14:01
  • I had to put /root/opt/lsi/3rdpartylibs/x86_64/libsysfs.so.2.0.2 to the same directory I had put MegaCli (/usr/local/bin)
    – Henno
    Jul 1, 2013 at 14:08
  • Are you sure? Correct it's megacli -CfgSpanAdd for raids 10,50,60 and others with arrays
    – abkrim
    Jun 4, 2015 at 18:10

MegaCli cfgspanadd r10 array0 "[25:02,25:21]" array1 "[25:02,25:21]" wb cached nocachedbadbbu a0 should work without problems.

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