[ClusterLabs] clustered MD - beyond RAID1

[roger zhou]

On 12/22/2015 10:33 AM, Tejas Rao wrote:
> On 12/21/2015 20:50, Aaron Knister wrote:
>
[...]
>>
>> I'm curious now, Redhat doesn't support SW raid failover? I did some
>> googling and found this:
>>
>> https://access.redhat.com/solutions/231643
>>
>> While I can't read the solution I have to figure that they're now
>> supporting that. I might actually explore that for this project.
> https://access.redhat.com/solutions/410203
> This article states that md raid is not supported in RHEL6/7 under any 
> circumstances, including active/passive modes.

OCFS2 or GFS2(same for GPFS, as the shared filesystem) over a shared 
storage is a typical Cluster configuration for Linux High Availability. 
Where, Clustered LVM (cLVM) is supported by both SUSE and Redhat to do 
mirroring to protect the data. However, the performance loss is very big 
and make people not so happy about this clustered mirror solution. This 
is where the motivation for clustered MD solution comes from.

With clustered md, this new solution could provide nearly the same 
performance as the native raid1. You may have interest to validate this 
from your lab with your configuration;)

Cheers,
Roger



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