[Xen-users] Best practices iSCSI / redundancy

["netz-haut - stephan seitz" <s.seitz@xxxxxxxxxxxx>]

Hi there,

I'ld like to ask if someone has some best practices at hand for following 
scenario.


We're currently running some Xen Hosts each equipped with hardware raid with 8 
to 12 disks and 4 nics dedicated for iSCSI.
Currently, there's no real installation consistence. Some domUs (all PV) are 
running with phy-backend over local LVM. Some others are using iSCSI where each 
domU has its own LUN.


We thought about adding some redundancy by building soft raid-1 over iSCSI LUN 
and local LVM. Well, this will affect fast and easy migration, but that's not a 
primary topic.


We ended up with two different possible configurations:
a) Having an iSCSI LUN for each physical Server with the size of one big 
physical partition. Adding LUN and physical partition into a raid-1 and putting 
LVM on top of this raidset. The virtual Server would use a LV on top of this 
big raid-1 PV/VG.
b) Setting a big VG on top of the physical partition, and having an iSCSI LUN 
and an LV for each virtual Server. Adding each LUN and each LV into an 
independent raid-1. The virtual Server would use a raid-1 MD build from one 
iSCSI and one local part.


Maybe some other scenarios are also possible, any thoughts are very welcome.


Regards,

Stephan



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