kvm: use preallocation option for fat disk resize by shwstppr · Pull Request #11986 · apache/cloudstack

shwstppr · 2025-11-05T11:54:50Z

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 · 2025-11-05T12:03:34Z

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 · 2025-11-06T08:57:07Z

@blueorangutan package

blueorangutan · 2025-11-06T08:58:03Z

@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 · 2025-11-06T10:50:50Z

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

weizhouapache · 2025-11-06T10:54:33Z

@blueorangutan test

blueorangutan · 2025-11-06T11:02:04Z

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

DaanHoogland

clgtm

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

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

shwstppr · 2025-12-12T10:56:42Z

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

@blueorangutan package

blueorangutan · 2025-12-12T10:58:04Z

@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 · 2025-12-12T13:06:53Z

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

shwstppr · 2025-12-13T10:23:00Z

@blueorangutan package

blueorangutan · 2025-12-13T10:24:04Z

@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 · 2025-12-13T11:45:52Z

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 · 2025-12-15T15:39:24Z

thanks @RosiKyu for testing!

DaanHoogland · 2025-12-16T10:57:16Z

@blueorangutan test

blueorangutan · 2025-12-16T10:58:04Z

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

blueorangutan · 2025-12-17T02:46:58Z

[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 · 2025-12-17T08:23:44Z

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

DaanHoogland · 2025-12-17T08:25:46Z

@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 · 2025-12-17T09:13:34Z

@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-cyborgBot 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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Comment threadplugins/hypervisors/kvm/src/test/java/org/apache/cloudstack/utils/qemu/QemuImgTest.java

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shwstppr added 3 commits November 12, 2025 17:46

kvm: use preallocation option for fat disk resize
2c9471e
Fixesapache#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 91a27dfCompare November 12, 2025 12:50

boring-cyborgBot 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 4.22November 12, 2025 12:50

RosiKyu removed their assignment Dec 12, 2025

fix
5934307
Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

boring-cyborgBot 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:4.22Dec 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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Description

Types of changes

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