Shared block device

[Scott Oertel]

Billy Crook wrote:
> Anyone know of a way to share a block device like Raid-1 across 
> multiple machines?  I want to get two machines to share files to the 
> same group of clients for R/W access and have changes replicated 
> between the two machines, so they'd be effective immediately for the 
> other clients.  A month ago, I googled, and found a wiki of a bunch of 
> different systems but they each had some fault.  Some could only be 
> written to from one place.  The comparison section of the page left me 
> ultimately thinking the only things that did what i wanted were 
> GoogleFS (NOT public) and a couple others that were really expensive. 
>
> I don't even so much care that the block device is whats replicated, 
> but trying to replicate a file system on demand like that I'm guessing 
> is not possible for locking reasons.  (Two people from different 
> servers could lock the same file in the same place and make changes to 
> it.  Has anyone here done anything like this before?
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You can setup shares over NFS and join them together using a software 
RAID (mdadm if you're using linux) . I read some places of people trying 
this and being somewhat successful.


-SO