{"id":7688,"date":"2026-08-12T14:19:04","date_gmt":"2026-08-12T13:19:04","guid":{"rendered":"https:\/\/tomaskalabis.com\/wordpress\/?p=7688"},"modified":"2026-08-12T14:21:22","modified_gmt":"2026-08-12T13:21:22","slug":"cant-create-a-snapshot-in-proxmox-fix-it-by-converting-raw-disks-to-qcow2","status":"publish","type":"post","link":"https:\/\/tomaskalabis.com\/wordpress\/cant-create-a-snapshot-in-proxmox-fix-it-by-converting-raw-disks-to-qcow2\/","title":{"rendered":"Can&#8217;t create a snapshot in Proxmox? Fix it by converting RAW disks to QCOW2"},"content":{"rendered":"\n<h3>Can&#8217;t create a snapshot in Proxmox? Fix it by converting RAW disks to QCOW2<\/h3>\n<p><em>If Proxmox says &#8222;The current guest configuration does not support taking new snapshots,&#8220; a RAW disk is almost always the reason. Here&#8217;s the fix, with a real example: VM 102 (MicroGuard) on node pve2.<\/em><\/p>\n<h2>Why bother?<\/h2>\n<p>RAW disks don&#8217;t support snapshots \u2014 that quick &#8222;save the current state&#8220; feature in Proxmox. QCOW2 disks do. This post walks through converting a VM&#8217;s disks from RAW to QCOW2\u00a0<strong>live, with zero downtime<\/strong>, using a real VM as an example.<\/p>\n<h2>What you&#8217;ll need<\/h2>\n<ul>\n<li>Access to the Proxmox web UI (or SSH to the node as root).<\/li>\n<li>Root\/admin privileges.<\/li>\n<li>A target storage that supports QCOW2 and snapshots \u2014 typically a &#8222;Directory&#8220; or &#8222;NFS&#8220; type storage (in this example,\u00a0<code>DORADO-60TB-2<\/code>).<\/li>\n<\/ul>\n<h3>Step 1: Open a console<\/h3>\n<p>In the Proxmox web UI, click the node your VM runs on (here,\u00a0<code>pve2<\/code>), then click the &#8222;&gt;_ Shell&#8220; button at the top. Or connect over SSH:<\/p>\n<pre><code>ssh root@pve2<\/code><\/pre>\n<h3>Step 2: Check the VM&#8217;s current disk setup<\/h3>\n<p>Run (replace 102 with your VM&#8217;s ID):<\/p>\n<pre><code>qm config 102<\/code><\/pre>\n<p>Look at each disk line (<code>sata0<\/code>,\u00a0<code>scsi0<\/code>,\u00a0<code>efidisk0<\/code>&#8230;) and the filename:<\/p>\n<ul>\n<li>Ends in\u00a0<code>.qcow2<\/code>\u00a0\u2192 already fine, nothing to do.<\/li>\n<li>No extension (e.g.\u00a0<code>vm-102-disk-1<\/code>) \u2192 it&#8217;s RAW and needs converting.<\/li>\n<\/ul>\n<p>On VM 102, the EFI disk was already qcow2, but the main disk\u00a0<code>sata0<\/code>\u00a0was RAW:<\/p>\n<p><a href=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/A_qmconfig_before.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-7689\" src=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/A_qmconfig_before-494x212.png\" alt=\"\" width=\"494\" height=\"212\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/A_qmconfig_before-494x212.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/A_qmconfig_before-288x124.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/A_qmconfig_before-768x330.png 768w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/A_qmconfig_before-1536x659.png 1536w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/A_qmconfig_before.png 1794w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><\/p>\n<figure>\n<figcaption>qm config 102 \u2014 sata0 is RAW, efidisk0 is already qcow2<\/figcaption>\n<\/figure>\n<h3>Step 3: Convert the RAW disk to QCOW2 \u2014 live, no downtime<\/h3>\n<p>No need to power off the VM. Proxmox copies the disk in the background, then transparently switches over \u2014 and you don&#8217;t need the command line for it. In the Hardware tab, click the disk, then click &#8222;Disk Action&#8220; at the top \u2192 &#8222;Move Storage&#8220;. Pick a target storage and set &#8222;Format&#8220; to &#8222;QEMU image format (qcow2)&#8220;:<\/p>\n<p><a href=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/I_move_disk_dialog.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-7696\" src=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/I_move_disk_dialog-494x229.png\" alt=\"\" width=\"494\" height=\"229\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/I_move_disk_dialog-494x229.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/I_move_disk_dialog-288x134.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/I_move_disk_dialog-768x357.png 768w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/I_move_disk_dialog-1536x713.png 1536w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/I_move_disk_dialog.png 1766w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><\/p>\n<figure>\n<figcaption>Move disk \u2014 pick a target storage and qcow2 as the format<\/figcaption>\n<\/figure>\n<div class=\"note\"><strong>Heads up:<\/strong>\u00a0the &#8222;Delete source&#8220; checkbox is checked by default in the GUI \u2014 meaning the old RAW disk gets deleted immediately once the move finishes, skipping the &#8222;unused disk&#8220; safety step entirely. If you&#8217;d rather confirm the VM boots fine first and delete the old disk afterwards (see Steps 5 and 6 below), uncheck it before clicking &#8222;Move disk&#8220;.<\/div>\n<div class=\"note\"><strong>Watch out:<\/strong>\u00a0if the VM also has an EFI disk (the\u00a0<code>efidisk0<\/code>\u00a0line) and it&#8217;s RAW, convert it the same way. It&#8217;s the disk people forget most often \u2014 and without it, snapshots won&#8217;t work for the whole VM, even if every other disk is fine.<\/div>\n<h3>Prefer the command line?<\/h3>\n<p>Same operation, via SSH. The command looks like:<\/p>\n<pre><code>qm move-disk &lt;VMID&gt; &lt;DISK&gt; &lt;TARGET_STORAGE&gt; --format qcow2<\/code><\/pre>\n<p>For VM 102&#8217;s\u00a0<code>sata0<\/code>\u00a0disk specifically:<\/p>\n<pre><code>qm move-disk 102 sata0 DORADO-60TB-2 --format qcow2<\/code><\/pre>\n<p>Proxmox streams live progress in the terminal while the VM keeps running:<\/p>\n<figure><a href=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/B_movedisk_progress.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-7690\" src=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/B_movedisk_progress-494x203.png\" alt=\"\" width=\"494\" height=\"203\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/B_movedisk_progress-494x203.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/B_movedisk_progress-288x118.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/B_movedisk_progress-768x315.png 768w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/B_movedisk_progress-1536x630.png 1536w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/B_movedisk_progress-2048x840.png 2048w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><br \/>\n<figcaption>Live migration progress \u2014 &#8222;transferred \u2026 100.00%, ready&#8220;<\/figcaption>\n<\/figure>\n<h3>Step 4: Verify the result<\/h3>\n<pre><code>qm config 102<\/code><\/pre>\n<p><code>sata0<\/code>\u00a0now ends in\u00a0<code>.qcow2<\/code>. Proxmox keeps the old RAW disk around as\u00a0<code>unused0<\/code>\u00a0for safety \u2014 it isn&#8217;t deleted automatically:<\/p>\n<figure><a href=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/C_qmconfig_after.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-7691\" src=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/C_qmconfig_after-494x196.png\" alt=\"\" width=\"494\" height=\"196\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/C_qmconfig_after-494x196.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/C_qmconfig_after-288x114.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/C_qmconfig_after-768x305.png 768w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/C_qmconfig_after-1536x610.png 1536w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/C_qmconfig_after.png 2040w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><br \/>\n<figcaption>qm config 102 after conversion \u2014 sata0 is qcow2, the old disk sits as unused0<\/figcaption>\n<\/figure>\n<h3>Step 5: Reboot the VM and confirm everything works<\/h3>\n<p>Before deleting the old disk, reboot the VM (shutdown + start) and make sure it comes up cleanly \u2014 login, apps, networking. Only once you&#8217;ve confirmed that is it safe to remove the old copy.<\/p>\n<figure><a href=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/D_hardware_running.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-7692\" src=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/D_hardware_running-494x182.png\" alt=\"\" width=\"494\" height=\"182\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/D_hardware_running-494x182.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/D_hardware_running-288x106.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/D_hardware_running-768x284.png 768w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/D_hardware_running-1536x567.png 1536w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/D_hardware_running-2048x757.png 2048w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><br \/>\n<figcaption>Hardware tab for VM 102 \u2014 the new sata0 (qcow2) is active, the VM is running, and the old disk waits as Unused Disk 0<\/figcaption>\n<\/figure>\n<h3>Step 6: Delete the old, unused disk<\/h3>\n<p>In the Hardware tab, click the &#8222;Unused Disk 0&#8220; row to select it, then click &#8222;Remove&#8220; at the top:<\/p>\n<figure><a href=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/E_hardware_remove.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-7693\" src=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/E_hardware_remove-494x194.png\" alt=\"\" width=\"494\" height=\"194\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/E_hardware_remove-494x194.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/E_hardware_remove-288x113.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/E_hardware_remove-768x301.png 768w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/E_hardware_remove-1536x603.png 1536w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/E_hardware_remove-2048x804.png 2048w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><br \/>\n<figcaption>Selecting Unused Disk 0 and clicking Remove<\/figcaption>\n<\/figure>\n<p>Proxmox asks for confirmation \u2014 the disk is only physically deleted once you click &#8222;Yes&#8220;:<\/p>\n<figure><a href=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/H_confirm_remove.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-7695\" src=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/H_confirm_remove-494x254.png\" alt=\"\" width=\"494\" height=\"254\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/H_confirm_remove-494x254.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/H_confirm_remove-288x148.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/H_confirm_remove-768x396.png 768w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/H_confirm_remove-1536x791.png 1536w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/H_confirm_remove-2048x1055.png 2048w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><br \/>\n<figcaption>Confirmation dialog when deleting Unused Disk 0<\/figcaption>\n<\/figure>\n<div class=\"warn\"><strong>Careful:<\/strong>\u00a0this is permanent. Only click &#8222;Yes&#8220; once you&#8217;re confident the VM is running normally on the new disk.<\/div>\n<p>The same thing can be done from the CLI:<\/p>\n<pre><code>qm unlink 102 --idlist unused0<\/code><\/pre>\n<h3>Step 7: Confirm snapshots now work<\/h3>\n<p>Go to the VM&#8217;s &#8222;Snapshots&#8220; tab and try &#8222;Take Snapshot.&#8220; It should work without any error.<\/p>\n<h2>Common issues<\/h2>\n<p><strong>Still get &#8222;The current guest configuration does not support taking new snapshots&#8220; after converting?<\/strong>\u00a0Some disk is still RAW somewhere \u2014 go back to Step 2 and double-check every single disk. The EFI disk is the usual culprit.<\/p>\n<figure><a href=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/G_snapshot_blocked.png\"><img decoding=\"async\" loading=\"lazy\" class=\"alignnone size-large wp-image-7694\" src=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/G_snapshot_blocked-494x200.png\" alt=\"\" width=\"494\" height=\"200\" srcset=\"https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/G_snapshot_blocked-494x200.png 494w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/G_snapshot_blocked-288x117.png 288w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/G_snapshot_blocked-768x311.png 768w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/G_snapshot_blocked-1536x623.png 1536w, https:\/\/tomaskalabis.com\/wordpress\/wp-content\/uploads\/2026\/08\/G_snapshot_blocked-2048x830.png 2048w\" sizes=\"(max-width: 494px) 100vw, 494px\" \/><\/a><br \/>\n<figcaption>The typical error when at least one disk still isn&#8217;t qcow2<\/figcaption>\n<\/figure>\n<p><strong>move-disk complains the storage doesn&#8217;t support that format?<\/strong>\u00a0Your target storage needs to be a Directory\/NFS\/CIFS type. LVM, LVM-thin, ZFS, and Ceph storages don&#8217;t use QCOW2 \u2014 they have their own native snapshot mechanisms instead.<\/p>\n<p><strong>&#8222;Not enough space&#8220;?<\/strong>\u00a0The target storage doesn&#8217;t have enough free room for the copy. Check under Datacenter \u2192 Storage.<\/p>\n<h2>TL;DR \u2014 full workflow for one VM<\/h2>\n<pre><code>qm config &lt;ID&gt;\nqm move-disk &lt;ID&gt; &lt;disk&gt; &lt;STORAGE&gt; --format qcow2   # for every RAW disk, EFI included\nqm config &lt;ID&gt;                                        # verify\nqm shutdown &lt;ID&gt; &amp;&amp; qm start &lt;ID&gt;                     # reboot, confirm it boots fine\nqm unlink &lt;ID&gt; --idlist unusedX                        # clean up the old copy<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Can&#8217;t create a snapshot in Proxmox? Fix it by converting RAW disks to QCOW2 If Proxmox says &#8222;The current guest configuration does not support taking new snapshots,&#8220; a RAW disk &#8230;<\/p>\n","protected":false},"author":2,"featured_media":7557,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[427],"tags":[425,352],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Can&#039;t create a snapshot in Proxmox? Fix it by converting RAW disks to QCOW2 - tomaskalabis.com<\/title>\n<meta name=\"description\" content=\"Getting &quot;cannot create snapshot&quot; in Proxmox? It&#039;s often a RAW disk. 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