Hi, A guy have reported on ceph mailing, a feature which is helping windows guest with ceph
https://review.opendev.org/#/c/658283/ "Add support for configuring the physical_block_size and logical_block_size hints of Cinder RBD volumes using the new 'disk_geometry' configuration option. Ceph performs much better when I/O is 4k-aligned otherwise it has to read the 4k from disk, modify and write it again. Linux guests generally submit 4k-aligned I/O, however Windows guests generally submit 512b-aligned I/O. When hinted with physical_block_size=4096 Windows guests will switch to submitting most I/O as 4k-aligned based on both testing and information from Microsoft KB 2510009. ... " the qemu command line options are physical_block_size logical_block_size -device virtio-blk-pci,id=data1,drive=data_image1,bus=pci.0,physical_block_size=4096,logical_block_size=512 in openstack,they propose to make a combo option "disk_geometry". https://review.opendev.org/#/c/658283/2/releasenotes/notes/rbd-disk-geometry-7753e2e3bc44cc3d.yaml cfg.StrOpt('disk_geometry', default='512e', choices=['512', '512e', '4k'], help='Configure the reported geometry (physical, logical) ' 'block size as 512 native (512/512), ' '512e emulated (4096/512) or 4k native (4096/4096). ' 'This hints to the operating system the desired size ' 'of I/O updates submitted to the disk. Windows systems ' 'send 512b-aligned I/O by default (unlike Linux which ' 'typically submits 4k-aligned I/O). Setting this option ' 'to 512e may allow the operating system to submit a 4k ' 'operation instead which will prevent Ceph needing to do ' 'an expensive read-modify-write of the smaller operation. ' '512e is the recommended setting as 4k native can cause ' 'compatability issues with some software and operating ' 'system versions according to Microsoft KB 2510009.'), could we add this as disk option ? (not defined by default). I'm going to do some benchmark next week. _______________________________________________ pve-devel mailing list pve-devel@pve.proxmox.com https://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel