I have a new server, that has 6 SATA HDs with 1TB each.

I am using a Hardware Raid

01:00.0 RAID bus controller: LSI Logic / Symbios Logic LSI MegaSAS 9260 (rev 03)

The server came preconfigured with RAID 6 only using 3 Harddrives.

Now I would like to migrate from the current to a Raid 10 using all 6 Harddrives. I have installed MegaCli. The OS is Debian Squeeze.

I understood, that live migration is supported. As the server is new, and does not carry any data, I am not concerned about backup. I just want to migrate to Raid Level 10 before starting to work with the server.

I understood, that I might need to use a syntax similar to

MegaCli –LDRecon -CfgSpanAdd -r10 -Array0[62:0,62:1] -Array1[62:2,62:3] -Array3[62:2,62:3] -a1

This should define a raid 10 with 3 units a 2 drives.

Will this liv- migrate everything without trouble?

My current raid config:

Adapter 0 -- Virtual Drive Information:
Virtual Drive: 0 (Target Id: 0)
Name                :
RAID Level          : Primary-6, Secondary-0, RAID Level Qualifier-3
Size                : 1.816 TB
Sector Size         : 512
Parity Size         : 3.633 TB
State               : Optimal
Strip Size          : 256 KB
Number Of Drives per span:3
Span Depth          : 2
Default Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU
Current Cache Policy: WriteBack, ReadAdaptive, Direct, No Write Cache if Bad BBU
Default Access Policy: Read/Write
Current Access Policy: Read/Write
Disk Cache Policy   : Disk's Default
Encryption Type     : None
Is VD Cached: No

SOLUTION: I learned, that a migration from 6 to 10 is simple not supported - so I am going to go through the webbios and setting up the raid from the beginning.

  • Array RAID level migrations and resizing typically takes hours, if not days to complete. Why don't you just scrap the VD configuration and create it anew?
    – the-wabbit
    Feb 23, 2013 at 19:44
  • BTW, this rather looks like a RAID-60 with 2x3 disks than a RAID-6 with 3 disks.
    – the-wabbit
    Feb 23, 2013 at 20:01
  • You are right - I will redo the raid with the webbios. I had some problems accessing the RMM console - so was looking for a shortcut ;-). But I learned it first is not a shortcut and second would not be possible anyway, as such a migration is not supported by RLM. Anyway thanks...
    – ChrisZZ
    Feb 24, 2013 at 13:17

1 Answer 1


The migration types allowed are limited. As per the the documentation for MegaRAID SAS Software, section 3.7.4 Migrating the RAID Level of a Virtual Drive:

Migrations are allowed for the following RAID levels:

  • RAID 0 to RAID 1
  • RAID 0 to RAID 5
  • RAID 1 to RAID 5
  • RAID 1 to RAID 6
  • RAID 5 to RAID 6

So migrating from RAID level 60 to 10 simply would not work.

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