kvm: use preallocation option for fat disk resize #11986

shwstppr · Nov 5, 2025

Description

Fixes #10589

Types of changes

Breaking change (fix or feature that would cause existing functionality to change)
New feature (non-breaking change which adds functionality)
Bug fix (non-breaking change which fixes an issue)
Enhancement (improves an existing feature and functionality)
Cleanup (Code refactoring and cleanup, that may add test cases)
Build/CI
Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

Major
Minor

Bug Severity

Screenshots (if appropriate):

How Has This Been Tested?

Preallocation flag added after changes,

2025-11-05 11:47:33,315 DEBUG [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Executing command [qemu-img create -o preallocation=full -f qcow2 /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 8589934592 ].
2025-11-05 11:49:07,780 DEBUG [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Successfully executed process [476300] for command [qemu-img create -o preallocation=full -f qcow2 /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 8589934592 ].
2025-11-05 11:49:07,781 DEBUG [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Executing command [qemu-img info -U /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 ].
2025-11-05 11:49:07,805 DEBUG [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Successfully executed process [476358] for command [qemu-img info -U /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 ].
2025-11-05 11:49:07,822 DEBUG [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Executing command [qemu-img convert -O qcow2 -o preallocation=full -U --image-opts driver=qcow2,file.filename=/mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/0abce4b6-b562-11f0-9bc2-1e008f00039b /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 ].
2025-11-05 11:50:49,386 DEBUG [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Successfully executed process [476361] for command [qemu-img convert -O qcow2 -o preallocation=full -U --image-opts driver=qcow2,file.filename=/mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/0abce4b6-b562-11f0-9bc2-1e008f00039b /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 ].
2025-11-05 11:50:49,387 DEBUG [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Executing command [qemu-img resize -o preallocation=full /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 10737418240 ].
2025-11-05 11:50:49,395 WARN  [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Execution of process [476480] for command [qemu-img resize -o preallocation=full /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 10737418240 ] failed.
2025-11-05 11:50:49,395 DEBUG [utils.script.Script] (AgentRequest-Handler-4:[]) (logid:729511e8) Exit value of process [476480] for command [qemu-img resize -o preallocation=full /mnt/ea3a10a7-49cb-3d72-bcc3-dec41ebecb7a/6e320e64-0621-43f5-ac4c-9a0f60201f03 10737418240 ] is [1].

How did you try to break this feature and the system with this change?

codecov · Nov 5, 2025

Codecov Report

❌ Patch coverage is 0% with 33 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.56%. Comparing base (671d8ad) to head (5934307).
⚠️ Report is 31 commits behind head on 4.22.

Files with missing lines	Patch %	Lines
...java/org/apache/cloudstack/utils/qemu/QemuImg.java	0.00%	32 Missing ⚠️
.../hypervisor/kvm/storage/LibvirtStorageAdaptor.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               4.22   #11986   +/-   ##
=========================================
  Coverage     17.55%   17.56%           
- Complexity    15536    15551   +15     
=========================================
  Files          5909     5910    +1     
  Lines        529118   529147   +29     
  Branches      64627    64636    +9     
=========================================
+ Hits          92902    92959   +57     
+ Misses       425761   425731   -30     
- Partials      10455    10457    +2

Flag	Coverage Δ
uitests	`3.58% <ø> (+<0.01%)`	⬆️
unittests	`18.63% <0.00%> (+0.01%)`	⬆️

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shwstppr · Nov 6, 2025

@blueorangutan package

blueorangutan · Nov 6, 2025

@shwstppr a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

weizhouapache

code lgtm

not tested

blueorangutan · Nov 6, 2025

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 15650

weizhouapache · Nov 6, 2025

@blueorangutan test

blueorangutan · Nov 6, 2025

@weizhouapache a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

plugins/hypervisors/kvm/src/test/java/org/apache/cloudstack/utils/qemu/QemuImgTest.java

DaanHoogland

clgtm

Fixes apache#10589 Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

shwstppr · Dec 12, 2025

Thanks @RosiKyu for the tests. I've added the change to fix params

@blueorangutan package

blueorangutan · Dec 12, 2025

@shwstppr a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

blueorangutan · Dec 12, 2025

Packaging result [SF]: ✖️ el8 ✖️ el9 ✖️ debian ✖️ suse15. SL-JID 16024

shwstppr · Dec 13, 2025

@blueorangutan package

blueorangutan · Dec 13, 2025

@shwstppr a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

blueorangutan · Dec 13, 2025

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 16037

RosiKyu

LGTM. Disk is fully preallocated as expected.

[root@ref-trl-10404-k-Mol9-rositsa-kyuchukova-kvm1 ~]# grep "415f694d-49f0-4bb6-b188-e95397dbc334" /var/log/cloudstack/agent/agent.log | grep "qemu-img"
2025-12-15 14:57:10,767 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Executing command [qemu-img create -o preallocation=full -f qcow2 /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 10737418240 ].
2025-12-15 14:58:28,079 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Successfully executed process [31759] for command [qemu-img create -o preallocation=full -f qcow2 /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 10737418240 ].
2025-12-15 14:58:28,081 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Executing command [qemu-img info -U /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 ].
2025-12-15 14:58:28,108 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Successfully executed process [31790] for command [qemu-img info -U /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 ].
2025-12-15 14:58:28,115 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Executing command [qemu-img convert -O qcow2 -o preallocation=full -U --image-opts driver=qcow2,file.filename=/mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/8d81fd6f-5aed-4993-af36-a16d0a7e61b9 /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 ].
2025-12-15 14:59:51,906 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Successfully executed process [31793] for command [qemu-img convert -O qcow2 -o preallocation=full -U --image-opts driver=qcow2,file.filename=/mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/8d81fd6f-5aed-4993-af36-a16d0a7e61b9 /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 ].
2025-12-15 14:59:51,907 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Executing command [qemu-img resize --preallocation=full /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 10737418240 ].
2025-12-15 14:59:52,026 WARN  [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Execution of process [31853] for command [qemu-img resize --preallocation=full /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 10737418240 ] failed.
2025-12-15 14:59:52,026 DEBUG [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Exit value of process [31853] for command [qemu-img resize --preallocation=full /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 10737418240 ] is [1].
2025-12-15 14:59:52,026 WARN  [utils.script.Script] (AgentRequest-Handler-1:[]) (logid:96111c19) Process [31853] for command [qemu-img resize --preallocation=full /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334 10737418240 ] encountered the error: [qemu-img: Preallocation can only be used for growing images].

[root@ref-trl-10404-k-Mol9-rositsa-kyuchukova-kvm1 ~]# ls -lsh /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334
12G -rw-r--r--. 1 root root 11G Dec 15 15:07 /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334
[root@ref-trl-10404-k-Mol9-rositsa-kyuchukova-kvm1 ~]# 
[root@ref-trl-10404-k-Mol9-rositsa-kyuchukova-kvm1 ~]# 
[root@ref-trl-10404-k-Mol9-rositsa-kyuchukova-kvm1 ~]# qemu-img info -U /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334
image: /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334
file format: qcow2
virtual size: 10 GiB (10737418240 bytes)
disk size: 11 GiB
cluster_size: 65536
Format specific information:
    compat: 1.1
    compression type: zlib
    lazy refcounts: false
    refcount bits: 16
    corrupt: false
    extended l2: false
Child node '/file':
    filename: /mnt/4680c43f-b2ce-3c6f-887e-9a923b277f01/415f694d-49f0-4bb6-b188-e95397dbc334
    protocol type: file
    file length: 10 GiB (10739318784 bytes)
    disk size: 11 GiB

weizhouapache · Dec 15, 2025

thanks @RosiKyu for testing!

DaanHoogland · Dec 16, 2025

@blueorangutan test

blueorangutan · Dec 16, 2025

@DaanHoogland a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

blueorangutan · Dec 17, 2025

[SF] Trillian test result (tid-14998)
Environment: kvm-ol8 (x2), zone: Advanced Networking with Mgmt server ol8
Total time taken: 54178 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr11986-t14998-kvm-ol8.zip
Smoke tests completed. 148 look OK, 1 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File
test_03_deploy_and_scale_kubernetes_cluster	`Failure`	25.62	test_kubernetes_clusters.py

DaanHoogland · Dec 17, 2025

@shwstppr , can you look at the remaining regression test failure. The title suggests it is related.

DaanHoogland · Dec 17, 2025

@shwstppr , can you look at the remaining regression test failure. The title suggests it is related.

maybe not but, it is also in #11962 (comment) (definately not related.

shwstppr · Dec 17, 2025

@DaanHoogland looked into the test logs, failure is not related,

jobresult : {errorcode : 530, errortext : "Resource limits prevent scaling the cluster: Maximum amount of resources of Type = \'cpu\', tag = \'null\' for Account Name = test-a-TestKubernetesCluster-LKO3MF in Domain Id = 1 is exceeded: Account Resource Limit = 40, Current Account Resource Amount = 4, Current Account Resource Reservation = 0, Requested Resource Amount = 2000."}

* 4.22: Update templateConfig.sh to not break with directorys with space on t… (#10898) Fix VM and volume metrics listing regressions (#12284) packaging: use latest cmk release link directly (#11429) api:rename RegisterCmd.java => RegisterUserKeyCmd.java (#12259) Prioritize copying templates from other secondary storages instead of downloading them (#10363) Show time correctly in the backup schedule UI (#12012) kvm: use preallocation option for fat disk resize (#11986) Python exception processing static routes fixed (#11967) KVM memballooning requires free page reporting and autodeflate (#11932) api: create/register/upload template with empty template tag (#12234)

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

boring-cyborg bot added the component:kvm label Nov 5, 2025

shwstppr closed this Nov 6, 2025

shwstppr marked this pull request as ready for review November 6, 2025 08:53

shwstppr reopened this Nov 6, 2025

shwstppr mentioned this pull request Nov 6, 2025

Image resize for fat type of disk does not preallocate additional space #10589

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plugins/hypervisors/kvm/src/test/java/org/apache/cloudstack/utils/qemu/QemuImgTest.java Show resolved Hide resolved

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shwstppr added 3 commits November 12, 2025 17:46

kvm: use preallocation option for fat disk resize

2c9471e

Fixes apache#10589 Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

fix tests

aaadbb6

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

skip tests conditionally

91a27df

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

shwstppr force-pushed the fix-fatdisk-resize branch from ece83a8 to 91a27df Compare November 12, 2025 12:50

boring-cyborg bot added component:agent component:backup component:kubernetes component:management-server component:orchestration component:packaging component:vmware distro:ubuntu labels Nov 12, 2025

shwstppr changed the base branch from main to 4.22 November 12, 2025 12:50

RosiKyu removed their assignment Dec 12, 2025

fix

5934307

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

boring-cyborg bot added the component:build label Dec 12, 2025

RosiKyu added status:testing and removed status:needs-work labels Dec 15, 2025

RosiKyu approved these changes Dec 15, 2025

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RosiKyu added status:ready-for-merge and removed status:testing labels Dec 15, 2025

DaanHoogland added status:waiting-for-smoketest-results and removed status:ready-for-merge labels Dec 16, 2025

DaanHoogland merged commit e08e66d into apache:4.22 Dec 17, 2025
24 of 27 checks passed

DaanHoogland deleted the fix-fatdisk-resize branch December 17, 2025 12:03

rajujith added this to Apache CloudStack 4.22.1 Jan 5, 2026

sureshanaparti moved this to Done in Apache CloudStack 4.22.1 Jan 7, 2026

dhslove pushed a commit to ablecloud-team/ablestack-cloud that referenced this pull request Jan 21, 2026

kvm: use preallocation option for fat disk resize (apache#11986)

3c76653

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

sandeeplocharla pushed a commit to NetApp/cloudstack that referenced this pull request Feb 6, 2026

kvm: use preallocation option for fat disk resize (apache#11986)

b98c70e

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

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kvm: use preallocation option for fat disk resize #11986

kvm: use preallocation option for fat disk resize #11986

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Description

Types of changes

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