From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from gate001.proxmox.com (gate001.proxmox.com [45.144.208.40]) by lore.proxmox.com (Postfix) with ESMTPS id 333581FF0AB for ; Wed, 09 Sep 2026 15:23:45 +0200 (CEST) Received: from gate001.proxmox.com (localhost.localdomain [127.0.0.1]) by gate001.proxmox.com (Proxmox) with ESMTP id 2F0182162C; Wed, 09 Sep 2026 15:23:22 +0200 (CEST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=THDVtzdksgIykgkRoAKGbnZQrTPUzWXUQF4wRAgBTlJbJ942La3scmqX9XBDlSX5NzuIAjwOng3JDVQ/K2FJxWElnAqIegY7+vCoxJXceHTdggWcSqiiWGgh8dWddCXzTZdmzBOa/uQ8pNwieC0jKNP/LtPcQ6Ac8rP7rqFireryHLYEsHCKCHPBXwUlTZXQ922L3Ex72q30E84NzapefAmkeqnqqVzU76LSZGYj+5on+5oYoTlY8MObUTeedsOXkfOwtUUpAE86l7PTw1vFkFgrKhvQvuW4qsOD00oRBurtEmm+wqwAeRSFxIk1FS/mJi/UjxNfuG98yiQO7bw2dg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; 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no-senders; approved; loop; banned-address; emergency; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="iso-2022-jp" X-Content-Filtered-By: Mailman/MimeDel 3.3.10 CC: pve-user X-Mailman-Version: 3.3.10 Precedence: list List-Id: Proxmox VE user list List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: Agreed. Furthermore, as long as it's all on one filesystem, you can skip the need for hard links by renaming/moving the files instead. This extends the downtime by perhaps a minute or so, as the mv(1) command runs. -Adam Get Outlook for Android ________________________________ From: Lund Svein-Erik Sent: Monday, 07 September 2026 03:20:57 To: Fabien Sirjean Cc: pve-user Subject: RE: Migrating a 10TB VM from ESXi to PVE/Ceph NFS is the easiest way to solve this. 1) Connect nfs storage to vmware (//vmware) 2) Move vm in vmware to nfs storage 3) Remove any vmware snapshots 4) Mount nfs storage on proxmox (//proxmox) 5) Create a identical vm on proxmox with the same sized vmdk files as storage, do not start vm 6) remove vmdk files in //proxmox/ 7) hardlink vmdk files from //vmware/ to corresponding location in //proxmox 8) Stop vm on vmware 9) Start vm on proxmox 10) MIgrate vm to permanent storage online. The downtime in this move will be the time you stop the vm in vmware to you start the vm back up in proxmox. Where and what type of nfs storage you use isn't really important as long as both proxmox and vmware can access the same export, and that the storage supports hardlinks. You might need to create the hardlinks on the nfs server it self. -- Svein-Erik --------------------------- From: "Fabien Sirjean" To: "undefined" Sent: Monday, September 7, 2026 9:08 AM Subject: Migrating a 10TB VM from ESXi to PVE/Ceph Dear all,

After successfully migrating most of our infrastructure (300+ VMs) from
VMware ESXi to PVE, we're struggling with one last critical VM: our
BlueMind/Cyrus mail server (~800 users), with a 10TB virtual disk.

Our setup is:

Source: ESXi → Dell EMC VPLEX (FC) → Dell Unity
Target: Proxmox VE → Ceph RBD (dedicated cluster)

We tried the Proxmox ESXi importer, but I/O performance degraded so much
during the live import that the mail service could not sustain its
normal workload.
We then stopped the service to complete the migration, but the import
eventually failed after almost 3 days, forcing us to start over.

Application-level migration/synchronization is not an option, so we're
looking for a block/storage-level approach with minimal downtime.

Since the datastore ultimately resides on our FC SAN, could we bypass
ESXi entirely and temporarily present the relevant VPLEX/Unity LUN to a
PVE or migration host, mount/access the VMFS datastore read-only, and
copy/convert the VMDK directly to Ceph RBD?
Even better, is there a practical way to perform the bulk copy while the
VM is running, then only synchronize the changed blocks during the final
cutover?

Any advice or experience with direct VMFS access, VPLEX/Unity
snapshots/clones, or other approaches for this kind of migration would
be greatly appreciated.

Thanks!