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1608 discussions

Which driver interface do I need to install Windows 2008 R2 as a KVM guest?
by carlopmart 17 Feb '10

17 Feb '10

Hi all, With the latest kvm updates, somebody have tried to install windows 2008 R2/windows 7 as a kvm guest using e1000 or virtio net driver?? Works with the windows installer?? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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bridged kvm guest and ever changing MAC address
by Veiko Kukk 16 Feb '10

16 Feb '10

Hi, Centos 5.4, dual igb ethernet, kvm guest (Centos 5.4). br0 is connected to eth0, guest has virtio ethernet connected to br0. Guest is configured using virt-manager. When host is booting, br0 gets mac address of eth0. Every time i start guest (with virt-manager) vnet0 appears and br0 mac aadressi on host is changed. Why does it need to change the mac? I'd like to keep it same, not to change it every time guest is booting. -- Veiko

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Install CentOS boot from iSCSI with Virtualization: could not get boot entry
by Bart Heinsius 13 Feb '10

13 Feb '10

Hi, I'm installing CentOS 5.4 on an iSCSI disk. When I choose to install the Server component only, the system boots perfectly from the iSCSI disk. When I choose to install the Server and the Virtualization components, it looks like the lvm root partition can't be mounted, I get the message: iscsistart: could not get boot entry Can't the Xen kernel boot from iSCSI? -Bart

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KVM - restart of VMs after rejoin a node into cluster
by Ingmar 11 Feb '10

11 Feb '10

Hi, I have the following problem ... I have a cluster with 2 nodes and use the Vrtualisierung KVM (83-105.el5_4.22) on CentOS 5.4 (x64 - 2.6.18-164.6.1.el5) with drbd 8.3.6. For the cluster, I use the following software tools: - heartbeat (3.0.1) - pacemaker (1.0.7) and - libvirt (0.6.3). If a node has been switched off or he was placed on standby and I activate it again, all VMs will be restarted (reboot) after the 2nd Node is online and active. Is this a known problem? Does anyone know where the bug is? Is there a solution for this? regards

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Enabling KSM with ksmctl under Centos 5.4
by Steven Ellis 11 Feb '10

11 Feb '10

Are their any good guides out there on how to use ksmctl to enable and tune KSM performance on Centos/RedHat At the moment the only guidelines I can find are from the following OLS paper, plus the Linux Kernel Docs. * http://www.kernel.org/doc/ols/2009/ols2009-pages-19-28.pdf * http://www.kernel.org/doc/Documentation/vm/ksm.txt On a basic dual core testbed with 4GB Ram and 4-5 VMs I've tried ksmctl start 60 5000 This resulted in a 5% system cpu load as it tried to recover shared space. Sadly I can't tell how well it is working as we don't have /sys/kernel/mm/ksm support in Centos. Has anyone got some guidelines on how to relate number of pages + interval to number of CPUs and Ram. Cheers Steve -- Bulletin.net <http://www.bulletin.net/> *Steven Ellis - Director of Worldwide Engineering,* *Bulletin.Net Inc* - http://www.bulletin.net/ *Ph* +64 9 307 1146 *Fax* +64 9 307 1148 *Mo* +64 21 321 673

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Re: [CentOS-virt] LTO tape drives and Bacula for Backups?
by Christopher G. Stach II 10 Feb '10

10 Feb '10

----- "compdoc" <compdoc(a)hotrodpc.com> wrote: > The tape is easily replaceable, without > having to worry about bad connectors that can plague hot > swap drive bay equipment. I really worry about your staff if you have damaged hot swap anything. How many insertions are they rated for? According to its data sheet, a lower end Tyco/AMP SATA connector measures up against EIA-364-09C (i.e., "Mate and unmated [sic] connector assemblies for 500 cycles at a maximum rate of 200 cycles/hour.") Other relevant forces are on there, and you can read the rest if you're interested here: http://tinyurl.com/ybnacp7 Basically, if you break them, you're doing something wrong or you are buying equipment with counterfeit or excessively substandard parts. I wouldn't consider this to be on the scale of a plague. > At $45 per tape for 320G of storage, it competes with hard > drives. In case of tape drive failure, the tapes still work > with the new drive. And with scsi or sata based tape drives, > speed is not a problem. Plus the cost of the tape drive (~$700), plus time, increased risk (longer backup duration means more risk), deployment flexibility, etc etc etc. > Combined with disk based network storage, tapes have a place > in IT. Yes, archival storage. -- Christopher G. Stach II http://ldsys.net/~cgs/

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LTO tape drives and Bacula for Backups?
by Lee Doran 10 Feb '10

10 Feb '10

How does everyone feel about using Quantum LTO 3 and 4 tapes with Bacula for backing up both the VM's, Host, as well as from within the VM's. What are know good backup solutions? Can anyone name specific tape drives / software that is working. Lee

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Best practices for LVM and virtualization
by Mathieu Baudier 10 Feb '10

10 Feb '10

Hello, I'm currently setting up a virtualization infrastructure based on CentOS 5.4 x86_64 and KVM. I want to use LVM because of its flexibility, especially the ability to add more disk space to a guest if needed. We are considering using an hardware RAID1 with BBU as the lowest layer. My question is: where is it recommended to put the LVM? 1. On the host only In that case, the guests would see logical volumes as hard drives and would be installed with "plain" partitions (ext3 / swap) When more space is needed the logical volume (from host perspective) / drive (from guest perspective) would simply become bigger. This feels simple, but I wonder whether there may be side effects, since real harddrive cannot grow, and maybe some parts of the system expect them to stay of a given size. 2. On the guest only On the host, there would only be "plain" raw partitions, which the guest would see as hard drives. The guest would be installed with an LVM and when more space is needed, an additional partition (from host perspective) / drive (from guest perspective) would be added to the guest volume group, which would then become bigger, allowing logical volumes to grow. I'm not too comfortable with that, since my understanding of the role of the host is to manage resources for the guests: memory, CPUs so I'd like to have some powerful abstraction there for disk space as well, which is one purpose of LVM. The guest would then need to be restarted when space is added. 3. On both host and guest LVM would be installed on the host, which would then provide the logical volumes as hard drives for the guest. The guest would use them as additional drives to be added to its own volume group when it needs to grow. This feels the most flexible, but I wonder whether it is not wrong to add LVM layers upon LVM layers, from a performance/stability/simplicity perspective. The guest would probably have to be restarted when more space is needed (I've not tested this extensively yet) I would be very interested to have your opinion / experience about this before I go further in my testing! Cheers, Mathieu

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Re: [CentOS-virt] Can I use direct attached storage as a shared filesystem in Xen
by Christopher G. Stach II 09 Feb '10

09 Feb '10

----- "Rich" <rhdyes(a)gmail.com> wrote: > I am doing rsync now. What is the difference between ocf2 and gfs? There are comparisons on the web, but in short, cluster size, GFS can be a major pain in the ass for some people to set up (fencing support is usually said pain), and GFS has distribution support. For such a small installation, you are probably better off with OCFS2. If you need something that is almost exactly the same as a local filesystem and depend upon certain filesystem behaviors for whatever reason (locking comes to mind), you will be better off with GFS. -- Christopher G. Stach II http://ldsys.net/~cgs/

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Re: [CentOS-virt] Can I use direct attached storage as a shared filesystem in Xen
by Christopher G. Stach II 09 Feb '10

09 Feb '10

----- "Rich" <rhdyes(a)gmail.com> wrote: > I think the better question is this. How can I make my 2 physical > servers that are identical into the best clustered solution sharing > the storage between the 2. Do you want the storage to be redundant between the two like RAID 1 or just all of it accessible to any guest on either machine like a JBOD? For either, you can use a suitable mix of drbd, iSCSI, GNBD, LVM, heartbeat, keepalived, and a clustered filesystem. If you do the latter, remember that this squares your risk. If you want a simple A/B failover setup where the second physical host is idle until the first physical host fails, you can just use drbd and heartbeat or RHCS. > They all use xfs. > I want to keep the guests the same on each server. > I will start with the backup server. I will go on each vm and delete > this FS and block device. > I then want make that whole 10 terabyte raid into one gfs and then > re-attach it back to each guest. > Is that possible or do I have to start all over again? If it can be > done I then will sync the date from the mainserver to this backup > server and then switch them and do the same to the mainserver. That sounds about right. You need to make your backups (!), destroy the data on of your servers by creating the new clustered filesystem, copy the data from the other server, and then share it with your reconfigured guests. So, basically what you said. > I have one more question which is another whole thread. > I am using rsync to sync the 2 physical boxes now. Is there a better > way to do this? drbd, but rsync does a pretty good job in a lot of use cases. I wouldn't say that it fits this one, though. -- Christopher G. Stach II http://ldsys.net/~cgs/

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