On 5 Aug 2009 at 10:25, Hannes Reinecke wrote:

> 
> Ulrich Windl wrote:
> > On 4 Aug 2009 at 10:51, solidguy wrote:
> > 
> >> We're using open-iscsi to connect a large number of virtual machines
> >> on a single host to the backend storage (in this case the hypervisor
> >> is Xen). We need to figure out how much memory to allocate for the
> >> management domain (dom0) -- and this is partly derived from the memory
> >> usage per ISCSI connection. Does anybody know offhand how much this
> >> would be for x86 and x86_64  kernel?
> > 
> > We run a dom0 with 256/384MB RAM, but have reduced it to a bare minimum 
> > (e.g. no 
> > X11 GUI, only terminal/SSH). However a bit more RAM would not harm.
> > 
> Watchout here, each SCSI device / LUN will take up quite a bit of memory.
> So if you're running on a low-RAM system you should take care not to
> connect too many LUNs to it.
> As an estimate I would take 1M per LUN; which is grossly exaggerated,
> of course, but will give you enough leeway to continue with your normal
> operations.
> 
> w/o YaST2, of course, which is a real memory hog :-)

No, rug/zmd is the memory hog ;-)

Anyway the system here with two LUNs for two DomUs seems sane:
# free
             total       used       free     shared    buffers     cached
Mem:        393216     344304      48912          0      62380      77500
-/+ buffers/cache:     204424     188792
Swap:     20972848       1840   20971008

Regards,
Ulrich


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