On Saturday August 27, [EMAIL PROTECTED] wrote:
> Is it possible to take a group of fibre channel drives on a fc-al loop, 
> run raid 5 on top of them, run lvm on top of that, then gfs on top of 
> that, and have the entire thing readable/writable by multiple machines 
> at the same time?  I have searched amongst lvm, clvm, evms, nbd, enbd, 
> linux software raid, etc. but to no avail.  I assume that both clvm or 
> evms would suit me to make the drives available to multiple machine 
> concurrently, but not allow redundancy.  Hopefully I am wrong and this 
> is in fact possible.

I think you are not wrong, sorry (assuming I understand you
correctly).

md/raid5 cannot be distributed.  At any one time, one machine must be
in control of the array and managing parity updates etc.  The device
provided by md/raid5 can obviously be share with GFS or NFS or nbd of
whatever.  But the management of the actually raid5 array must in the
hands of just one machine.

NeilBrown


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