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Re: [linux-lvm] Distributed LVM/filesystem/storage



On Sat, 31 May 2008, Jan-Benedict Glaw wrote:

> GFS (or GFS2 fwiw) imposes a single, shared storage as its backend. At
> least I get that from reading the documentation. This would result in
> merging all the single disks via NBD/LVM to one machine first and
> export that merged volume back via NBD/iSCSI to the nodes. In case the
> actual data is local to a client, it would still be first send to the
> central machine (running LVM) and loaded back from there. Not as
> distributed as I hoped, or are there other configuration possibilities
> to not go that route?

Any possible scheme combining disks over the network is going to
send the data over the network twice.  The solution is simple -
put the low level disk traffic on its own network.  Consider it
a long distance SCSI bus.  If you think about it, normal NFS disk traffic
goes over a "network" twice also.  Once over the ethernet, and again
over the IDE/SCSI/SATA "network".

-- 
	      Stuart D. Gathman <stuart bmsi com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.


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