virt March 2012

virt@lists.centos.org

11 participants
12 discussions

IDE mapping to SATA in virtual guest
by Bradley Leonard 15 Mar '12

15 Mar '12

Hi, I'm trying to map a logical volume (sata) as an ide drive from my centos 6.2 host to my centos 6.2 guest. Here is xml snippet: <disk type='block' device='disk'> <driver name='qemu' type='raw' cache='none' io='native'/> <source dev='/dev/VolGroup02/LogVol00'/> <target dev='hda' bus='ide'/> <address type='drive' controller='0' bus='0' unit='0'/> </disk> Dmesg shows this: sd 0:0:0:0: [sda] 5859368960 512-byte logical blocks: (2.99 TB/2.72 TiB) sd 0:0:0:0: [sda] Write Protect is off sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA sda: unknown partition table sd 0:0:0:0: [sda] Attached SCSI disk sd 0:0:0:0: Attached scsi generic sg0 type 0 Inside the guest, it shows up as a sata drive: [root@nemedia ~]# sfdisk -l /dev/sda Disk /dev/sda: 364728 cylinders, 255 heads, 63 sectors/track sfdisk: ERROR: sector 0 does not have an msdos signature /dev/sda: unrecognized partition table type No partitions found [root@nemedia ~]# sfdisk -l /dev/hda /dev/hda: No such file or directory sfdisk: cannot open /dev/hda for reading I don't see how this would be a problem except for the fact that no matter what kind of filesystem I try to create on /dev/sda from the guest, I get errors when I try to mount it. No matter what I do, I cannot mount any filesystem from that device inside the guest. Both the cdrom and block device are showing up as scsi devices even though I'm passing them through as ide devices. Am I doing something wrong or am I missing something completely? I've try searching for solution or a hint, but I must not be searching for the right thing. Can anybody provide me some advice or point me somewhere? Thanks in advance. Brad -- Bradley Leonard EMail: bradley at stygianresearch.com Rob - "The hills are alive with the..the..sound of monkeys?" Bucky - "It's in the key of delicious." Life is simple. Humans make it complicated. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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KVM, VLAN and Bridges and bonding
by Baptiste AGASSE 03 Mar '12

03 Mar '12

Hi all, I use CentOS5.x + Xen in production for virtualization. I use it with bridged vlan networks and bonding (active-backup) like that: eth0 eth1 | | ------- | bond0-------bond0.10---------bond0.12 ... | | | | vlanbr10 vlanbr12 dom0 | | ------------- -------------- | | | | | | ... domU1 domU2 domU3 domU4 domU5 domU6 For future hypervisors, i want to implement the same things with CentOS6.x + KVM. In test env i've setup CentOS6.2 + KVM (with last updates) with the same network config, but guest lose network connection very often, and i don't know why. Network config: /etc/sysconfig/network-scripts/ifcfg-bond0.6: DEVICE=bond0.6 BRIDGE=vlanbr6 ONBOOT=yes BOOTPROTO=none VLAN=yes TYPE=Ethernet /etc/sysconfig/network-scripts/ifcfg-vlanbr6: DEVICE=vlanbr6 TYPE=Bridge ONBOOT=yes BOOTPROTO=none DELAY=0 I've installed guest like that (with a lot of retry because of network loss during installation) virt-install --name=guest02-c6 --disk path=/var/lib/libvirt/images/guest02-c6.img,size=10,sparse=false --graphics=spice,keymap=fr --vcpus=2 --ram=2048 --location=http://spacewalk.example.com/pub/dist/centos/6/x86_64/ --extra-args="ks=http://spacewalk.example.com/pub/ks/el6/guest02.el6.cfg ip=192.168.2.12 netmask=255.255.255.224 gateway=192.168.2.10 dns=192.168.2.10" --os-type=linux --os-variant=rhel6 --network=bridge:vlanbr6,model=virtio Someone have setup similar environment ? Regards. Baptiste.

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virt March 2012