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Open source virt geek


Nov
18
comment why linux bridge shows 2 mac addresses for one qemu vm?
yes, the tap is hooked into the bridge, and the VM (qemu) to the tap. BTW, note how libvirt uses macs that look like "FE:xx:xx:..." for the tap macs - this is on purpose, so that a starting VM's mac doesn't overwrite the bridge's mac, which can happen if the upcoming MAC value is lower than the bridge's. This will cause a network outage until arp is refreshed on the switch.
Nov
18
answered why linux bridge shows 2 mac addresses for one qemu vm?
Nov
18
revised why linux bridge shows 2 mac addresses for one qemu vm?
format
Nov
18
comment why linux bridge shows 2 mac addresses for one qemu vm?
oh, well then, ps -ef |grep qemu
Nov
18
comment SSD as cheap alternative to SAN storage?
I mean backing up to archive-able medium is also an absolute must, and DR site replication too. This local backup is not a replacement for what already is there, just an addition
Nov
17
comment why linux bridge shows 2 mac addresses for one qemu vm?
can you show the domxml for the VMs (just the networking part), ifconfig and network configuration files?
Nov
17
comment KVM 802.1q (tagged VLAN setup)
Strange, this is very basic stuff, documented in quite a few KB articles all over the internet (I've written the one on Red Hat's KB)
Nov
17
comment SSD as cheap alternative to SAN storage?
In my setup, I have several Dell MD1220 boxes attached to the hosts that need local PIT copies, but they cost quite a bit initially, and they take up 2U each
Nov
17
comment SSD as cheap alternative to SAN storage?
double the restore time then.
Nov
17
answered SSD as cheap alternative to SAN storage?
Nov
14
comment High packet loss with kvm, bridge and bonding
afaik there was some problem with arp monitoring or somesuch. access.redhat.com/solutions/661043
Nov
13
comment High packet loss with kvm, bridge and bonding
or mode 2 or 3, they all work somehow. The ones that work best are 1 (because it's so simplistic) and 4 (because it will rely on hardware instead of trying to manipulate at the host level). Only 0 and 6 are heavily problematic, while 1 and 4 receive the most testing.
Nov
10
answered High packet loss with kvm, bridge and bonding
Nov
6
comment Is the gang scheduling employed by VMware a serious drawback?
So, if I install single-threaded (duh!) MSDOS in a 16-core VM, every CPU cycle of the VM will not lock down 16 cores on the host, but only one pCPU? This, and not the speed of CPUs, is the main drawback of gang scheduling.
Nov
4
comment Guest-VM can only ping CentOS KVM host, cannot access anything else
Any chance the switch has port protection turned on, and it blocks traffic originated at a MAC that isn't the MAC of the plugged in eth?
Nov
3
comment Change KVM boot order with multiple virtio disks in guest
you've got it :)
Nov
3
answered Change KVM boot order with multiple virtio disks in guest
Nov
2
comment Change KVM boot order with multiple virtio disks in guest
well, it obvious, set the wanted disk as virtio-disk0, with target of /dev/vda. The order the disks appear in, in the XML are also important, so make sure the OS disk comes first
Nov
2
comment Change KVM boot order with multiple virtio disks in guest
Please post the domxml and which disk you want to be first
Oct
28
awarded  Nice Answer