virt July 2008

virt@lists.centos.org

13 participants
6 discussions

Windows HVM VMs - speed needed...
by Stephen 20 Jul '08

20 Jul '08

Hi All, I was hoping to run a Windows 2003 server in production on Centos 5.2 however the performance isn't very good. The host is Centos 5.2 64 bit. I did some file transfers and I'm seeing about 12Mb/s on a Windows 2003 VM and about 8Mb/s on a Windows 2003 32 bit VM. Numbers are measured using the builtin Windows 2003 server networking monitor (Press Ctrl Alt Del in Windows and go to the Windows tab). The server is an IBM xServe about a year old and the VMs are running in LVM partitions. Switches are Cisco Gigabit. So the hardware for server performance and network performance are not a limiting factor - I understand that the results I'm seeing are typical without running paravirtualized drivers in Windows. Just wanted to ask what the options are to get things going faster. I believe the choices are:- - Pay the dollars for a RedHat subscription which includes paravitualized drives for Windows - Install the LGPL PV drivers (don't want to do this, these are production machines and even up to a few months ago I'm seeing reports of VM corruption in the list. It would appear that the LGPL PV drivers are not at production standard yet) - Pay for an alternative Xen distribution, such as Xen's commercial product. Can someone confirm, have I covered all the bases? Thanks Stephen

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firewall best practice on dom-0
by Kai Schaetzl 20 Jul '08

20 Jul '08

I took over a custom firewall script from my older Suse machines to my Dom-Us and it works just fine. Doing the same for Dom-0 immediately killed all traffic for the VMs. As there was no need before I had been dropping everything on the FORWARD chain. After ACCEPTing all for FORWARD my VMs are happy again. What's best practice on Dom-0, what do you do? Can I restrict the forwarding, in which way? Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

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shut off ipv6 in Xen vifs?
by Kai Schaetzl 20 Jul '08

20 Jul '08

How can I shut off the autoconfig for ipv6 in the virtual network devies/bridge, which happens although ipv6 is shut off for the machine? The only relevant thread I could find is this: http://lists.xensource.com/archives/html/xen-devel/2007-01/msg00005.html Kai -- Kai Schätzl, Berlin, Germany Get your web at Conactive Internet Services: http://www.conactive.com

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xen 3.2
by Justin Lim 16 Jul '08

16 Jul '08

Any ideal when 3.2 xen will be avail for centos? Thanks!

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Need kernel-debuginfo-2.6.9-67.0.20.EL.x86_64.rpm
by Jerry Amundson 15 Jul '08

15 Jul '08

Short story: Would it be possible to get kernel-debuginfo-2.6.9-67.0.20.EL.x86_64.rpm on di.c.o? I have a need to run crash on a 2.6.9-67.0.20.ELxenU xm dump-core. Long story: Two Dell 6950 (now called R905, 4 Dual-Core AMD Opteron 8200 series) heartbeat/drbd nodes running the stock CentOS 5.2 Dom0. The domU's are the only resources in heartbeat. Dom1 is a perfectly running, updated, CentOS 5.2 Apache/MySQL/Samba server (2.6.18-92.1.6.el5xen). It's xen config: name = "guinan" bootloader = "/usr/bin/pygrub" uuid = "8fa0ac9e-fe28-17f5-6a72-07f84b4daa24" memory = 4097 vcpus = 6 on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ "type=vnc,vncunused=1,keymap=en-us" ] disk = [ "phy:/dev/drbd1,xvda,w", "phy:/dev/drbd2,xvdb,w" ] vif = [ "mac=00:16:3e:68:16:5d,bridge=xenbr0", "bridge=xenbr1" ] Dom2 is a CentOS 4.6 software development and database server (2.6.9-67.0.20.ELxenU). Every so often, could be several hours or several days, it just hangs, locks up, becomes unresponsive. Nothing to the console. Nothing logged. When it gets to this point, the only recourse is an xm destroy. It's occurred with every combination of Dom0/DomU. The hardware of both servers checks out OK. The only sign of life, on Dom2's current Dom0, xentop shows CPU usage, and at a high percent, at that: xentop - 12:02:36 Xen 3.1.2-92.1.6.el5 2 domains: 2 running, 0 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown Mem: 16775712k total, 11629904k used, 5145808k free CPUs: 8 @ 2194MHz NAME STATE CPU(sec) CPU(%) MEM(k) MEM(%) MAXMEM(k) MAXMEM(%) VCPUS NETS NETTX(k) NETRX(k) VBDS VBD_OO VBD_RD VBD_WR SSID Domain-0 -----r 50891 1.5 901352 5.4 no limit n/a 8 4 17720114 18765713 0 0 0 0 0 monolith -----r 965342 599.2 10486632 62.5 10486784 62.5 6 2 332672635 30178285 2 0 15805538 60805435 0 I've experimented with various xen config's. Currently it's this: name = "monolith" uuid = "283746fa-c708-cfa0-f5df-cad6abea568e" memory = 10241 vcpus = 4 bootloader = "/usr/bin/pygrub" on_poweroff = "destroy" on_reboot = "restart" on_crash = "restart" vfb = [ "type=vnc,vncunused=1,keymap=en-us" ] disk = [ "phy:/dev/drbd3,xvda,w", "phy:/dev/drbd4,xvdb,w" ] vif = [ "mac=00:16:3e:08:8d:c3,bridge=xenbr0", "bridge=xenbr1" ] Previously, I'd tried adjusting memory, but the problem resurfaced. Currently, I've gone from 6 vcpus to the 4 shown above in the hopes that stabilizes it. I'm at wits end. I've committed these machines to production status, so this instability has everyone kind of on edge, and wanting to go back to bare metal... jerry -- "Your life is trite and jaded, boring and confiscated." - Twisted Sister

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Any news about next kvm release for centos 5.2?
by carlopmart 11 Jul '08

11 Jul '08

Hi all, Which will be next stable release for CentOS 5.2?? Can i use on a production enviromment?? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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virt July 2008