Alternative one: Disks are cheap! Buy one with 3tb and you have plenty of headroom.
On 11 Jul 2017 5:40 p.m., "Leroy Tennison" <leroy.tenni...@verizon.net> wrote: > Thanks for letting me know I'm not making myself clear, let me try again > with a few more specifics, These are Windows VMs with three disk images > for C:, D: and L:. To simplify I'll focus on the image for C: which had > grown to 77G physical size on the hypervisor's ssd (I just double-checked > that with 'ls -al' because qemu-img below says 70G, this image had two > snapshots at one time which may be the reason for the discrepancy). > qemu-img info reports: > > file format: qcow2 > virtual size: 100G (107374182400 bytes) > disk size: 70G > cluster_size: 65536 > Format specific information: > compat: 0.10 > > I used Windows Server 2012r2 "Optimize" (defrag) and then reduced the C: > partition to about 67G in Disk Administrator leaving the remaining 33G as > unallocated. Afterward I tried a web reference technique and used > Sysinternals SDelete to zero the free space then used 'qemu-img convert -O > qcow2 <original.qcow2> <new.qcow2>' to produce a physical image size of > 29G. qemu-img info reports on "new.qcow2": > > file format: qcow2 > virtual size: 100G (107374182400 bytes) > disk size: 29G > cluster_size: 65536 > Format specific information: > compat: 1.1 > lazy refcounts: false > > The issue is that the virtual size is still 100G. I don't have the > physical disk space to allow approximately 12 images (all configured for a > virtual size of 100G) to grow to that size (6 VMs with C: and D: on a 1TB > ssd, L: is on an hdd which isn't an issue). I need to change that virtual > size number for this image to 67 or 68G. On the D: images I can drop to > approximately 40G for an aggregate total of about 650G for all six VMs - > well within the 875G physical size limitation that the ssd provides after > overhead. > > That's a long background to why I need to change the virtual disk size. > Again, any alternatives would be much appreciated. > > -----Original Message----- > From: Martin Kletzander <mklet...@redhat.com> > To: Leroy Tennison <leroy.tenni...@verizon.net> > Cc: libvirt-users <libvirt-users@redhat.com> > Sent: Tue, Jul 11, 2017 2:51 am > Subject: Re: [libvirt-users] Is there still no easier way to shrink a VM > image? > > On Tue, Jul 11, 2017 at 12:34:31AM -0500, Leroy Tennison wrote: > >I have numerous qcow2 images which need to be reduced in size and have > >their maximum size (virtual size) reduced. Physical disk space became > >so low that VMs "auto-paused" themselves, I moved enough images to solve > >the immediate problem but need to rectify the underlying issue. It > >seems that qcow[2] files are grown in size such that the data inside of > >them takes about 50-60% of the space (does anyone know the actual > >algorithm or how to control it?). Given the total physical disk space > >on the hypervisors, I need something more restrictive. > > > > I don't get it. You have virtual size greater than the free space on > the physical storage and instead of the VM finding out you want the > guest OS to see it has no space at all? > > >Our hypervisors are a mix of Ubuntu 14 or 16 LTS (qemu-img 2.2 or 2.5). > >After doing all the preparation (defragment, reduce OS partition size) > >"qemu-img resize" reports that shrinking isn't supported yet. My web > >research indicates that, to accomplish this, I have to: > > > > convert to raw > > > > shrink the image > > > > convert back to qcow[2] > > > > increase the image size to provide for some growth > > > >I'm hoping I've missed something in my research and that someone knows > >an easier way. I don't feel constrained to qemu-img but this is a > >production environment precluding consideration of experimental > >software. Virt-resize, guestfish or any other reasonable option is fine > >with me. Solutions or ideas? Thanks. > > > > >_______________________________________________ > >libvirt-users mailing list > >libvirt-users@redhat.com > >https://www.redhat.com/mailman/listinfo/libvirt-users > > _______________________________________________ > libvirt-users mailing list > libvirt-users@redhat.com > https://www.redhat.com/mailman/listinfo/libvirt-users >
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