[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [Bug 1810603] [NEW] QEMU QCow Images crow dramatically
From: |
Eric Blake |
Subject: |
[Qemu-devel] [Bug 1810603] [NEW] QEMU QCow Images crow dramatically |
Date: |
Sat, 05 Jan 2019 16:25:13 -0000 |
On 1/5/19 9:32 AM, Lenny Helpline wrote:
>
> You can reproduce this bug as follow:
> 1) create an initial disk image
> 2) create a linked clone
> 3) create a snapshot of the linked clone
> 4) revert the snapshot every X minutes / hours
Needs more details to reproduce. What is the exact command you used for
each of these steps? For example, without that command, I can't tell if
you are creating internal or external snapshots, and that drastically
changes the approach for how to deal with reverting snapshots.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3226
Virtualization: qemu.org | libvirt.org
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1810603
Title:
QEMU QCow Images crow dramatically
Status in QEMU:
New
Bug description:
I've recently migrated our VM infrastructure (~200 guest on 15 hosts)
from vbox to Qemu (using KVM / libvirt). We have a master image (QEMU
QCow v3) from which we spawn multiple instances (linked clones). All
guests are being revert once per hour for security reasons.
About 2 weeks after we successfully migrated to Qemu, we noticed that
almost all disks went full across all 15 hosts. Our investigation
showed that the initial qcow disk images blow up from a few gigabytes
to 100GB and more. This should not happen, as we revert all VMs back
to the initial snapshot once per hour and hence all changes that have
been made to disks must be reverted too.
We did an addition test with 24 hour time frame with which we could
reproduce this bug as documented below.
Initial disk image size (created on Jan 04):
-rw-r--r-- 1 root root 7.1G Jan 4 15:59 W10-TS01-0.img
-rw-r--r-- 1 root root 7.3G Jan 4 15:59 W10-TS02-0.img
-rw-r--r-- 1 root root 7.4G Jan 4 15:59 W10-TS03-0.img
-rw-r--r-- 1 root root 8.3G Jan 4 16:02 W10-CLIENT01-0.img
-rw-r--r-- 1 root root 8.6G Jan 4 16:05 W10-CLIENT02-0.img
-rw-r--r-- 1 root root 8.0G Jan 4 16:05 W10-CLIENT03-0.img
-rw-r--r-- 1 root root 8.3G Jan 4 16:08 W10-CLIENT04-0.img
-rw-r--r-- 1 root root 8.1G Jan 4 16:12 W10-CLIENT05-0.img
-rw-r--r-- 1 root root 8.0G Jan 4 16:12 W10-CLIENT06-0.img
-rw-r--r-- 1 root root 8.1G Jan 4 16:16 W10-CLIENT07-0.img
-rw-r--r-- 1 root root 7.6G Jan 4 16:16 W10-CLIENT08-0.img
-rw-r--r-- 1 root root 7.6G Jan 4 16:19 W10-CLIENT09-0.img
-rw-r--r-- 1 root root 7.5G Jan 4 16:21 W10-ROUTER-0.img
-rw-r--r-- 1 root root 18G Jan 4 16:25 W10-MASTER-IMG.qcow2
Disk image size after 24 hours (printed on Jan 05):
-rw-r--r-- 1 root root 13G Jan 5 15:07 W10-TS01-0.img
-rw-r--r-- 1 root root 8.9G Jan 5 14:20 W10-TS02-0.img
-rw-r--r-- 1 root root 9.0G Jan 5 15:07 W10-TS03-0.img
-rw-r--r-- 1 root root 10G Jan 5 15:08 W10-CLIENT01-0.img
-rw-r--r-- 1 root root 11G Jan 5 15:08 W10-CLIENT02-0.img
-rw-r--r-- 1 root root 11G Jan 5 15:08 W10-CLIENT03-0.img
-rw-r--r-- 1 root root 11G Jan 5 15:08 W10-CLIENT04-0.img
-rw-r--r-- 1 root root 19G Jan 5 15:07 W10-CLIENT05-0.img
-rw-r--r-- 1 root root 14G Jan 5 15:08 W10-CLIENT06-0.img
-rw-r--r-- 1 root root 9.7G Jan 5 15:07 W10-CLIENT07-0.img
-rw-r--r-- 1 root root 35G Jan 5 15:08 W10-CLIENT08-0.img
-rw-r--r-- 1 root root 9.2G Jan 5 15:07 W10-CLIENT09-0.img
-rw-r--r-- 1 root root 41G Jan 5 15:08 W10-ROUTER-0.img
-rw-r--r-- 1 root root 18G Jan 4 16:25 W10-MASTER-IMG.qcow2
You can reproduce this bug as follow:
1) create an initial disk image
2) create a linked clone
3) create a snapshot of the linked clone
4) revert the snapshot every X minutes / hours
Due the described behavior / bug, our VM farm is completely down at
the moment (as we run out of disk space on all host systems). A quick
fix for this bug would be much appreciated.
Host OS: Ubuntu 18.04.01 LTS
Kernel: 4.15.0-43-generic
Qemu: 3.1.0
libvirt: 4.10.0
Guest OS: Windows 10 64bit
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1810603/+subscriptions
- [Qemu-devel] [Bug 1810603] [NEW] QEMU QCow Images crow dramatically, Lenny Helpline, 2019/01/05
- Re: [Qemu-devel] [Bug 1810603] [NEW] QEMU QCow Images crow dramatically, Eric Blake, 2019/01/05
- [Qemu-devel] [Bug 1810603] [NEW] QEMU QCow Images crow dramatically,
Eric Blake <=
- [Qemu-devel] [Bug 1810603] Re: QEMU QCow Images grow dramatically, Peter Maydell, 2019/01/07
- [Qemu-devel] [Bug 1810603] Re: QEMU QCow Images grow dramatically, Lenny Helpline, 2019/01/08
- [Qemu-devel] [Bug 1810603] Re: QEMU QCow Images grow dramatically, Kevin Wolf, 2019/01/11
- [Qemu-devel] [Bug 1810603] Re: QEMU QCow Images grow dramatically, Lenny Helpline, 2019/01/18
- [Qemu-devel] [Bug 1810603] Re: QEMU QCow Images grow dramatically, Kevin Wolf, 2019/01/18
- [Qemu-devel] [Bug 1810603] Re: QEMU QCow Images grow dramatically, Lenny Helpline, 2019/01/28