Ulf Kreutzberg
2007-Dec-14 14:51 UTC
[Xen-users] number of exportable blockdevices seems to be limited
Hi xen-users, perhaps you can help me with the following: I am trying to start about 30 (or even more if possible) domU on a host, each domU gets 6 partitions (each partion is a logical LVM volume in dom0) and it gets two NICs. In Xen 3.0.3, kernel 2.6.16 32bit, there has been an issue with limited IRQs. I now have compiled a Xen3.1, kernel 2.6.18 64bit, and raised nr_dynirqs to 768 as discussed in a threat on http://lists.xensource.com/archives/html/xen-devel/2006-12/msg00311.html Perhaps this was not necessary in my case, but now I do not get any "running out of IRQ" messages any more. But if domU 29 oder 30 starts, some vbds seem to break down, a Kernel Panic in domU occurs, and maybe some block device of another, earlier started domU disappears which causes that domU to hang. So, finally my question is, is the overall number of exporteable block devices limited and is there any (compiling-) option to fix this? Workarounds like to export a lv as a pv for the domU and making a lvm environment there are too dirty and will cost performance, I think. But any suggestions are welcome. Perhaps some of you have experiences in that. If you need more information, just let me know (hw is a dual quadcore xeon L5310, 16G RAM on DELL 2950). Many thanks in advance and best regards, Ulf -- Psssst! Schon vom neuen GMX MultiMessenger gehört? Der kann`s mit allen: http://www.gmx.net/de/go/multimessenger _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users