How to create Raid 10 with megacli

megaclimegaraidraidraid10

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?

Best Answer

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)
 Name:
 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
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