Re: [Openstack-operators] 4K block size

2018-04-23 Thread Mark Mielke
On Mon, Apr 23, 2018 at 3:54 PM, Sean McGinnis wrote: > On Mon, Apr 23, 2018 at 05:46:40PM +, Tim Bell wrote: > > Has anyone experience of working with local disks or volumes with > physical/logical block sizes of 4K rather than 512? > > There seems to be KVM support for this (http://fibrevil

Re: [Openstack-operators] 4K block size

2018-04-23 Thread John van Ommen
The benchmarks DO appear to show a modest improvement. In the bugzilla post you linked, Paolo said that "With 4k logical sector size in the host, you must have a 4k logical sector size in the guest too." So it appears you'd need to use a disk that physically supports it, along with an OS that su

Re: [Openstack-operators] 4K block size

2018-04-23 Thread Sean McGinnis
On Mon, Apr 23, 2018 at 05:46:40PM +, Tim Bell wrote: > > Has anyone experience of working with local disks or volumes with > physical/logical block sizes of 4K rather than 512? > > There seems to be KVM support for this > (http://fibrevillage.com/sysadmin/216-how-to-make-qemu-kvm-accept-4k

[Openstack-operators] 4K block size

2018-04-23 Thread Tim Bell
Has anyone experience of working with local disks or volumes with physical/logical block sizes of 4K rather than 512? There seems to be KVM support for this (http://fibrevillage.com/sysadmin/216-how-to-make-qemu-kvm-accept-4k-sector-sized-disks) but I could not see how to get the appropriate f