Iops » История » Редакция 7
Редакция 6 (Андрей Волков, 2012-05-25 18:59) → Редакция 7/8 (Андрей Волков, 2012-05-25 19:04)
h1. IOPS (Input/Output Operations Per Second) Отличная подборка для понимания показателя IOPS: http://en.wikipedia.org/wiki/IOPS Утилита тестирования (gentoo): sys-block/fio-2.0.7:0::ekb-info IOPS в QEMU-KVM http://wiki.qemu.org/Features/VirtioIoeventfd DiskIOLimits в QEMU-KVM еще не готов: http://wiki.qemu.org/Features/DiskIOLimits *Background* When several instances of QEMU are running they can interfere with system performance through excessive disk I/O. Sometimes it is desirable to limit disk I/O in order to keep QEMU from affecting other applications or instances. The availability of disk I/O throttling depends on the underlying storage (image file, LVM, NFS, Ceph). On Linux the cgroups blkio-controller supports I/O throttling on block devices but is a relatively recent feature. More importantly, there is no single mechanism for disk I/O throttling across all underlying storage types and for some types there is no way to throttle at all. The disk I/O limits feature introduces QEMU block layer I/O limits together with command-line and QMP interfaces for configuring limits. This allows I/O limits to be imposed across all underlying storage types using a single interface.