Re: [ceph-users] Doesn't Support Qcow2 Disk images
ceph is RAW format - should be all fine...so VM will be using that RAW format On 12 March 2015 at 09:03, Azad Aliyar azad.ali...@sparksupport.com wrote: Community please explain the 2nd warning on this page: http://ceph.com/docs/master/rbd/rbd-openstack/ Important Ceph doesn’t support QCOW2 for hosting a virtual machine disk. Thus if you want to boot virtual machines in Ceph (ephemeral backend or boot from volume), the Glance image format must be RAW. -- Warm Regards, Azad Aliyar Linux Server Engineer *Email* : azad.ali...@sparksupport.com *|* *Skype* : spark.azad http://www.sparksupport.com http://www.sparkmycloud.com https://www.facebook.com/sparksupport http://www.linkedin.com/company/244846 https://twitter.com/sparksupport3rd Floor, Leela Infopark, Phase -2,Kakanad, Kochi-30, Kerala, India *Phone*:+91 484 6561696 , *Mobile*:91-8129270421. *Confidentiality Notice:* Information in this e-mail is proprietary to SparkSupport. and is intended for use only by the addressed, and may contain information that is privileged, confidential or exempt from disclosure. If you are not the intended recipient, you are notified that any use of this information in any manner is strictly prohibited. Please delete this mail notify us immediately at i...@sparksupport.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Andrija Panić ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Doesn't Support Qcow2 Disk images
On 12-03-15 13:00, Lindsay Mathieson wrote: On Thu, 12 Mar 2015 12:49:51 PM Vieresjoki, Juha wrote: But there's really no point, block storage is the only viable option for virtual machines performance-wise. With images you're dealing with multiple filesystem layers on top of the actual block devices, plus Ceph as block storage supports pretty much everything that qcow2 as a format does. Not much difference that I've noticed on the small system I run, in fact cepfs seems to do some caching which speeds up things considerably in benchmarks. Not a huge difference in actual app performance that I've noticed. Delete/Restore of snapshots is a lot quicker with qcow2 and for somereasons saving memory state is orders of magnitude quicker with qcow2. Don't, simply don't run your VMs with QCOW2 over CephFS. You bring in so much more complexity by adding a Posix Filesystem and the Ceph MDS. Although CephFS might look faster due to the kernel caching, it's not safer! Use RBD with Qemu, it keeps it all in userspace, a lot better then going through all the kernelspace things. Wido ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Doesn't Support Qcow2 Disk images
But there's really no point, block storage is the only viable option for virtual machines performance-wise. With images you're dealing with multiple filesystem layers on top of the actual block devices, plus Ceph as block storage supports pretty much everything that qcow2 as a format does. On 12 March 2015 at 12:18, Lindsay Mathieson lindsay.mathie...@gmail.com wrote: On Thu, 12 Mar 2015 09:27:43 AM Andrija Panic wrote: ceph is RAW format - should be all fine...so VM will be using that RAW format If you use cephfs you can use qcow2. ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Doesn't Support Qcow2 Disk images
On Thu, 12 Mar 2015 12:49:51 PM Vieresjoki, Juha wrote: But there's really no point, block storage is the only viable option for virtual machines performance-wise. With images you're dealing with multiple filesystem layers on top of the actual block devices, plus Ceph as block storage supports pretty much everything that qcow2 as a format does. Not much difference that I've noticed on the small system I run, in fact cepfs seems to do some caching which speeds up things considerably in benchmarks. Not a huge difference in actual app performance that I've noticed. Delete/Restore of snapshots is a lot quicker with qcow2 and for somereasons saving memory state is orders of magnitude quicker with qcow2. ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Doesn't Support Qcow2 Disk images
http://docs.openstack.org/image-guide/content/ch_converting.html On Mar 12, 2015 6:50 AM, Vieresjoki, Juha j...@void.fi wrote: But there's really no point, block storage is the only viable option for virtual machines performance-wise. With images you're dealing with multiple filesystem layers on top of the actual block devices, plus Ceph as block storage supports pretty much everything that qcow2 as a format does. On 12 March 2015 at 12:18, Lindsay Mathieson lindsay.mathie...@gmail.com wrote: On Thu, 12 Mar 2015 09:27:43 AM Andrija Panic wrote: ceph is RAW format - should be all fine...so VM will be using that RAW format If you use cephfs you can use qcow2. ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Doesn't Support Qcow2 Disk images
On Thu, 12 Mar 2015 09:27:43 AM Andrija Panic wrote: ceph is RAW format - should be all fine...so VM will be using that RAW format If you use cephfs you can use qcow2. ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
