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Is it possible not to use "-usbdevice tablet" for selected guests? It is generating lots of interrupts, affecting responsiveness, but is normally not needed for console only Linux guests. This is especially visible with more guests running on a host. Reference...

Is it repeatable/reproducible?

During host bootup, I believe all guests are started at the same time. On a busy host with multiple guests, this can result in some guests not starting properly, i.e.: Kernel panic - not syncing: IO-APIC + timer doesn't work! Is it possible, on host bootup, not to start all the guests at...

OK; so kvm module is loaded and used. You may try using e1000 network card for your guest (you have to stop and start the guest after you edit that file). top: start it, press shift + P.

"uptime" also shows system load, which is the most interesting thing it outputs ;) How many percent of CPU does kvm use in top? Are you sure you are using kvm modules - could you also paste the output of lsmod? Also, please paste the contents of the guest's configuration (in /etc/qemu-server).

What does "uptime" show? When you start top, are there any processes taking excessive load?

Is it a "stable" version of kvm-86, or some git development snapshot? # dmesg|grep kvm loaded kvm module (kvm-kmod-devel-86) kvm: emulating exchange as write

Ah, cool. So that's the easiest way to do basic traffic accounting per guest. Add a simple daemon which reads the stats every 5 minutes or so, saves it in some format to be parsed later and you have very nice traffic accounting (per hour, day, month etc.). Is there an easy way to save the...

I wonder - what is the easiest way to determine which vmtab* interface on host is attached to which guest?

You should definitely try to reconstruct the whole server once ;) You'll be amazed that these tapes fail only when you really need data from them... "I thought we had backup, damn!" ;) Yes, RAID is not backup. For some people it's the same though (they usually learn after the first major data...

How do you do the above if your hardware controller doesn't present any good/faulty LED to the outside?

UPS devices fail too! Some will have self-tests triggered from time to time to warn you if anything bad happens. But yes, it happens very rarely - usually, in the most unexpected moment ;)

You can do software RAID on about anything (i.e. one part local, one accessible through iSCSI or nbd), so it will depend on the underlying hardware. But in short, with most SATA or SCSI controllers, yes. There are some things you have to do manually: - kick the faulty disk out of sw RAID -...

If you mount your filesystem with barrier=1 option, data should be safe even if your system crashes (or is powered off brutally) with unsaved data in disk cache. However, barriers are not supported when used with software RAID or LVM (2.6.30 kernel should be able to do it once it's released)...

Re: kvm guest sometimes not recognizing keyboard Most probably a bug in KVM - see this thread: http://osdir.com/ml/fedora-virt/2009-04/msg00066.html

Anyone else seeing this? If you're not sure, on your Linux guest, do something like: grep i8042 /var/log/kern* (or grep "i8042.c: No controller found" /var/log/kern*) This will output if the keyboard was there or not, historically.

Re: kvm guest sometimes not recognizing keyboard Good clue. I see it sometimes as well. Keyboard works in BIOS, but after Linux boots (I haven't tried Windows), keyboard doesn't work any more. VM reboots don't fix it. The only thing which fixes it is when I shutdown the virtual machine and...

I installed Proxmox VE 1.1 on software RAID manually. And after an upgrade to 1.2 it didn't boot up with 2.6.24-5-pve kernel (kernel panic, couldn't find init). The problem is that for some reason, on upgrade, the system creates the initrd with "mkinitrd". It produces an initrd which doesn't...

apt-get install syslog-ng ?

http://www.mjmwired.net/kernel/Documentation/networking/bonding.txt