Re: changing memory size with virsh setmem - results only visible in domain, not on host
On 3/6/20 10:45 AM, Lentes, Bernd wrote: Hi, i have a Linux domain (Ubuntu 14.04) where we like to be able to change the amount of usable memory. We have a balloon device and statistics are switched in 5 sec. rhythm. The domain shows very quickly changes (following top) when we change the memory size with setmem, but the host does not show changes in the use of memory for the respective domain. How are you looking at it from the host? From the memory-related values in 'virsh dominfo' or 'virsh dumpxml'? Is the host KVM or Xen? Is that expected behavior ? Host is SLES 12 SP4, libvirt is 4.0.0-8.15.2 There was a Xen bug along these lines, fixed by commit 11c8aca9. I've verified your version of libvirt contains that fix. Regards, Jim
KVM on CentOS 7 - sluggish performance with Win10 Guest
Hey all, I've been running a Win10 Pro (64bit) guest for some time now and originally it was pretty snappy and I had no complaints. Somewhere in about the last 3-6 months I've been noticing sluggish performance -- but not overall. The system is mostly remote so I do a lot of my admin via RDP or the local console with the KVM Manager. I recently did a complete fresh install of Win10 Pro (1909. Previous install was 1607) and both show the same problem. The ONLY real thing running on this VM is Milestone's surveillance system (standalone host). Where I see the "sluggish" is: Connecting to milestone mobile server (either through web browser or client). for the small number of cameras, the connection spool up takes like 15 seconds which is noticeably longer than other systems I have set up with more load/tasks in terms of cameras. This used to be speedy and fine. The other place I see sluggish operation is on the desktop doing some typical tasks and seeing "not responding" in the window of the task that goes away - but should it ever appear to begin with? The system is a Supermicro motherboard with Dual Intel(R) Xeon(R) CPU E5-2640 v4 @ 2.40GHz w/64GB The Guest is provided with 20 cores in a config of 1 CPU, 10 cores - 2 threads per core. There are dedicated NICs (dual NIC card) attached to the system via macvtap (and are not used by CentOS in any way except to pass through to this Guest) I'm using QCOW2 for the base OS. The storage volume for video are raw devices. Once a process is running, performance seems fine... it seems to be starting processes or something. I'm not sure -- and I'm not as intimate with KVM/libvirt as I'd like to be yet. So I'm wondering if there's any performance tweaks I should know about. I've read about using .img vs .qcow2 already. I'm using virt-io drivers to some extent but is there anything else I'm missing? Thanks in advance, -Ben
changing memory size with virsh setmem - results only visible in domain, not on host
Hi, i have a Linux domain (Ubuntu 14.04) where we like to be able to change the amount of usable memory. We have a balloon device and statistics are switched in 5 sec. rhythm. The domain shows very quickly changes (following top) when we change the memory size with setmem, but the host does not show changes in the use of memory for the respective domain. Is that expected behavior ? Host is SLES 12 SP4, libvirt is 4.0.0-8.15.2 Bernd -- Bernd Lentes Systemadministration Institute for Metabolism and Cell Death (MCD) Building 35.34 - Raum 208 HelmholtzZentrum münchen bernd.len...@helmholtz-muenchen.de phone: +49 89 3187 1241 phone: +49 89 3187 3827 fax: +49 89 3187 2294 http://www.helmholtz-muenchen.de/mcd Perfekt ist wer keine Fehler macht Also sind Tote perfekt Helmholtz Zentrum München Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir.in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671
snapshotting disk images with exchange db / volumes
I have been asking at technet about if I could snapshot an exchange db volume[1]. But it looks like that windows server backup is sort of doing the same. Creating vs image, and backup that one. However they truncated the exchange db log files after a succesful procedure. I was wondering if someone is doing this already. How does the guest freeze work exactly in windows (In linux it is quite clear no io is done). I assume that if the guest is invoking the vss service, and then you snapshot on the host environment. You have a snapshot with a vss image? So if you want to recover, you first need to 'roll back' to that internal vss image on the snapshot? [1] https://social.technet.microsoft.com/Forums/office/en-US/7818e7a5-3c09-4f36-9158-e423d0c0a705/mailbox-database-disk-snapshot?forum=Exch2016GD https://social.technet.microsoft.com/Forums/office/en-US/922ff22a-73d6-4b86-b718-b6300754a467/wsbexchangeexe-how-to-use-how-does-it-work-with-wbadmin-and-vssfull-fixing-external?forum=Exch2016GD
