[Xen-users] maximum number of domus with xen 3.2

[Markus Hochholdinger <Markus@xxxxxxxxxxxxxxxxx>]

hello,

i'm doing some testing here to reach the limits of my xen setup. My setup 
consists of two xen hosts where the storage is managed with lvm and 
tranposrted over the network with iscsi and the network is attached over 
xenbr0. My domus have 2 raid1 devices (rootfs and swap) which each consist of 
one block device from xen host one and one block device from xen host two.

I can now start 47 domus on one xen host. Starting the 48-th domu the boot 
process hangs with the following message:
XENBUS: Waiting for devices to initialise: 295s...290s..

(I also had this message some time ago with SLES10 as domU, but this was 
because of some misconfiguration in the domu config.)

Starting the 48-th domu on the other xen host ist just fine. When i live 
migrate this 48-th domu to the first xen host it get unresponsive until i 
live migrate it back. Nothing special in xend.log. (live migration is working 
fine with less than 48 domus.)

Natural limits are normally on some byte limits, but i didn't find anything. 
The involved block devices of my 48-th domu have minor numbers 96 and 97 
(iscsi and lv). Also the vif appears in the xenbr0. The total number of block 
devices are 48*4=192 and the total number of vif are 48.

I'm using Debian 5.0 with kernel 2.6.26-2-xen-686 for my dom0s and for my 
domus i'm using 2.6.18 (Xen 3.2) or 2.6.26-2-xen-686. Performance with 47 
running domus is just fine :-)

Anyone has any idea where i can look to overcome the limit of 47 domus on one 
xen host? I'm hoping the answer is something like max_loop=255...


-- 
greetings

eMHa

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