Hi all, My concern was about security warnings not to use the qemu-img resize command with running VMs.
I was not aware, that there is also a libvirt command that may be used to do secure online resizing. virsh blockresize domain path-to-image size Should work securely. Sorry to bother you. But I banged my head on this several times in the last months and was very disappointed not to securely being able to resize volumes. I was not aware of the libvirt option. Kind regards, Melanie Melanie Desaive Cloud DevOps Engineer Cloud Management Platform [cid:logo-aktuell-193px_17c55ea4-b743-4459-8492-93a5f153938c.png] [email protected] NTT DATA Business Solutions Global Managed Services GmbH Bismarckstrasse 105 – 10625 Berlin, Germany www.nttdata-solutions.com<https://nttdata-solutions.com/de/> [cid:image002_9a8f5529-347a-4a29-94f2-f6c20d166fc9.png]<https://www.linkedin.com/company/nttdatasolutions-ger/> [cid:image003_9807fcff-df79-41d4-ae52-7e249915dd12.png] <https://www.xing.com/pages/ntt-data-business-solutions-ger> [cid:image007_945ef6da-cf94-4598-8077-367f3309531f.png] <https://www.youtube.com/channel/UCrl5wnvXHQ2MVqQ4mH2Ik2w> [cid:image005_0a7f9378-c955-4bf5-bffd-e42fceb2caa5.png] <https://twitter.com/NDBS_GER> [cid:image004_1c0ea0b8-be9c-40f9-99ed-44853d4d35a9.png] <https://www.facebook.com/NTTDATABusinessSolutionsGER> Bleiben Sie auf dem Laufenden - mit unserem Infoservice! Jetzt kostenlos registrieren!<https://nttdata-solutions.com/de/news-and-insights/itelligence-infoservice/> Geschäftsführung: Mirko Kruse, André Walter Sitz und Amtsgericht: Dresden / HRB 21356 This email and any attachments are sent in strictest confidence for the sole use of the addressee and may contain legally privileged, confidential, and proprietary data. If you are not the intended recipient, then you have received this email in error. If this is the case please advise the sender by replying promptly to this email and then permanently delete this email and any attachments without any use, dissemination, printing, copying or forwarding. Copyright NTT DATA Business Solutions. All rights reserved Von: Desaive, Melanie <[email protected]> Gesendet: Dienstag, 31. August 2021 10:56 An: [email protected] Betreff: qemu volume online resize Hi all, I am writing to this mailing list with some KVM/qemu specific question, that is not directly connected to CloudStack. But hope to find the KVM expertise here, to maybe solve my problem.😉 We are using some plain KVM hypervisors to host our CloudStack VMs (cloudstack management, cloudstack database and some additional services like DNS, email, etc.). When resizing volumes in this plain qemu/KVM environment all documentation I checked warns, that this should only be done offline – with a powered down VM. Actually we did often successfully online resize volumes anyway. We are using volume in the raw format. If it is necessary, we will change our procedure to only offline resizing volumes. But does anyone here have knowledge in this topic and can advice what the actual risk is and if online resizing might be secure after maybe taking some precautions? Kind regards, Melanie
