[one-users] iSCSI multipath

[Miloš Kozák]

Hi, I am setting up a small installation of opennebula with 
sharedstorage using iSCSI. THe storage is Equilogic EMC with two 
controllers. Nowadays we have only two host servers so we use backed 
direct connection between storage and each server, see attachment. For 
this purpose we set up dm-multipath. Cause in the future we want to add 
other servers and some other technology will be necessary in the network 
segment. Thesedays we try to make it as same as possible with future 
topology from protocols point of view.

My question is related to the way how to define datastore, which driver 
and TM is the best and which?

My primal objective is to avoid GFS2 or any other cluster filesystem I 
would prefer to keep datastore as block devices. Only option I see is to 
use LVM but I worry about concurent writes isn't it a problem? I was 
googling a bit and I found I would need to set up clvm - is it really 
necessary?

Or is better to use iSCSI driver, drop the dm-multipath and hope?

Thanks, Milos
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