Re: [libvirt-users] VM I/O performance drops dramatically during storage migration with drive-mirror

2018-05-29 Thread Eric Blake
On 05/28/2018 07:05 AM, Kashyap Chamarthy wrote: Cc the QEMU Block Layer mailing list (qemu-bl...@nongnu.org), who might have more insights here; and wrap long lines. ... 170 to less than 10. I also show the figure of this experiment in the attachment of this email. [The attachment should

Re: [libvirt-users] Using libvirt to access Ceph RBDs with Xen

2018-05-29 Thread Jim Fehlig
On 05/27/2018 05:42 AM, thg wrote: Hi everybody, my background: I'm doing Xen since 10++ years, many years with DRBD for high availability, since some time I'm using preferable GlusterFS with FUSE as replicated storage, where I place the image-files for the vms. In my current project we

Re: [libvirt-users] [libvirt] virRandomBits - not very random

2018-05-29 Thread John Ferlan
On 05/29/2018 09:44 AM, Michal Privoznik wrote: > On 05/29/2018 03:38 PM, Martin Kletzander wrote: >> On Fri, May 25, 2018 at 09:37:44AM -0500, Eric Blake wrote: >>> On 05/25/2018 09:17 AM, Michal Privoznik wrote: >>> >> We should probably seed it with data from /dev/urandom, and/or the new

Re: [libvirt-users] [libvirt] virRandomBits - not very random

2018-05-29 Thread Michal Privoznik
On 05/29/2018 03:38 PM, Martin Kletzander wrote: > On Fri, May 25, 2018 at 09:37:44AM -0500, Eric Blake wrote: >> On 05/25/2018 09:17 AM, Michal Privoznik wrote: >> > We should probably seed it with data from /dev/urandom, and/or the new > Linux getrandom() syscall (or BSD equivalent). >>>

Re: [libvirt-users] [libvirt] virRandomBits - not very random

2018-05-29 Thread Martin Kletzander
On Fri, May 25, 2018 at 09:37:44AM -0500, Eric Blake wrote: On 05/25/2018 09:17 AM, Michal Privoznik wrote: We should probably seed it with data from /dev/urandom, and/or the new Linux getrandom() syscall (or BSD equivalent). I'm not quite sure that right after reboot there's going to be

Re: [libvirt-users] VM I/O performance drops dramatically during storage migration with drive-mirror

2018-05-29 Thread Chunguang Li
> -Original Messages- > From: "Kashyap Chamarthy" > Sent Time: 2018-05-28 21:19:14 (Monday) > To: "Chunguang Li" > Cc: libvirt-users@redhat.com, qemu-bl...@nongnu.org, dgilb...@redhat.com > Subject: Re: [libvirt-users] VM I/O performance drops dramatically during > storage migration

Re: [libvirt-users] VM I/O performance drops dramatically during storage migration with drive-mirror

2018-05-29 Thread Chunguang Li
> -Original Messages- > From: "Kashyap Chamarthy" > Sent Time: 2018-05-28 20:05:05 (Monday) > To: "Chunguang Li" > Cc: libvirt-users@redhat.com, qemu-bl...@redhat.com, dgilb...@redhat.com > Subject: Re: [libvirt-users] VM I/O performance drops dramatically during > storage migration