HPE Community read-only access December 15, 2018
This is a maintenance upgrade. You will be able to read articles and posts, but not post or reply.
Hours:
Dec 15, 4:00 am to 10:00 am UTC
Dec 14, 10:00 pm CST to Dec 15, 4:00 am CST
Dec 14, 8:00 pm PST to Dec 15, 2:00 am PST
ProLiant Servers (ML,DL,SL)
cancel
Showing results for 
Search instead for 
Did you mean: 

raid 5 to raid 6 migration

 
SOLVED
Go to solution
Alexander Ramos
Occasional Advisor

raid 5 to raid 6 migration

I have a dl360 g5 with the p400i controller. We just got the battery backed cache upgrade installed. however there was already one array with two raid 5 logical drives configured.

my question is can i migrate both logical drives from raid 5 to raid 6? The server is running centos (red hat clone). When I open the ACU and click the logical drives I am given the option to migrate raid/strip size but the fault tolerance options are either Raid 5 (current) or raid 0.

Do I need something else besides the battery backed cache (512mb)?

Or am I stuck rebuilding? Thanks for your time.

All drives bays are filled with 72gb sas drives if that matters.
4 REPLIES
BenS
Advisor
Solution

Re: raid 5 to raid 6 migration

It sounds like you may be stuck with rebiulding with that configuration. RAID 6 arrays give you n-2 drives available for data (as opposed to n-1 for RAID 5). If you had spare bays available, you may have been able to add another hard drive, and with that migrate to a RAID 6 array, but since all drive bays are populated, you're probably out of luck.
TTr
Honored Contributor

Re: raid 5 to raid 6 migration

When you convert from R5 to R6 you are assigning another hard disk as parity so you are losing that same space from the total effective space of the R5 group. Do you have the equivalent of 1 hard disk unallocated in the existing r5 group? If so you may be able to do it. That is after you add the BBWC. Otherwise if your LUNs are using up most of the R5 space you can't do it.
Patrick Terlisten
Honored Contributor

Re: raid 5 to raid 6 migration

Hello,

you need enough free space for the new, additional parity informations. So add new disks or release spare drives and add them to the array.

Best regards,
Patrick
Best regards,
Patrick
Alexander Ramos
Occasional Advisor

Re: raid 5 to raid 6 migration

Thanks. Not the answers I wanted to hear but the correct ones.