Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

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.

share|improve this question
    
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 '13 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 '13 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 '13 at 13:17

1 Answer 1

up vote 3 down vote accepted

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.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.