Etch amd64 + perc6/E RAID arrays + clustering (heartbeat)

[Chase Bolt]

I would take a look into DRBD. It is a Master/Slave relationship between two
servers, mirroring the specified drives. Server A would be the Master and
would replicate the chosen disks to Server B. When Heartbeat detects Server
A going down, it would promote Server B to become the new Master.

It can take a bit to get the setup working correctly, but when you do, it
works really well.

--Chase Bolt

-----Original Message-----
From: linux-poweredge-bounces at dell.com
[mailto:linux-poweredge-bounces at dell.com] On Behalf Of admin at matphot.com
Sent: Thursday, October 09, 2008 3:02 PM
To: linux-poweredge at dell.com
Subject: Etch amd64 + perc6/E RAID arrays + clustering (heartbeat)

Dear All,

First off, I've got four PE1950 machines running amd64 etch, each  
managing two MD1000's through perc6/E SATA controllers.

My goal is to develop an always-available, high-security (high  
performance if possible) data storage system.

Assuring the security/performance of the storage space under each  
server is not a great problem (either RAID 10 or RAID 50 or RAID 51),  
but I would like to consider perc6/E card failure, or the failure of a  
server itself, as I would like to provide a failproof-as-possible  
service that would be available uninterrupted around the clock. My  
idea was to have one server managing two first-level RAID 5 arrays  
'mirrored' (clustered) to another managing also two first-level RAID  
arrays, with the content of one RAID array on one server 'mirrored' to  
another under the other server.

I have read up on "heartbeat" (heartbeat-2) and it seems to do what I  
need as far as clustering servers goes, but what I can't find is a  
means to 'cluster' (or 'mirror') the contents of one RAID array to  
that of another under another server. Is this possible, or am I  
looking in the wrong place?

I am still rather new to this, so any and all advice would be a great  
help.

Thanks, best,

J.M.S.

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