Iops » История » Версия 8
Андрей Волков, 2012-05-25 19:30
| 1 | 3 | Андрей Волков | h1. IOPS (Input/Output Operations Per Second) |
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| 2 | 1 | Андрей Волков | |
| 3 | Отличная подборка для понимания показателя IOPS: |
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| 4 | http://en.wikipedia.org/wiki/IOPS |
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| 5 | 4 | Андрей Волков | |
| 6 | Утилита тестирования (gentoo): |
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| 7 | sys-block/fio-2.0.7:0::ekb-info |
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| 8 | 5 | Андрей Волков | |
| 9 | IOPS в QEMU-KVM |
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| 10 | http://wiki.qemu.org/Features/VirtioIoeventfd |
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| 11 | 6 | Андрей Волков | |
| 12 | DiskIOLimits в QEMU-KVM еще не готов: |
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| 13 | 1 | Андрей Волков | http://wiki.qemu.org/Features/DiskIOLimits |
| 14 | 7 | Андрей Волков | |
| 15 | *Background* |
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| 17 | 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. |
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| 19 | 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. |
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| 21 | 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. |
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| 22 | 8 | Андрей Волков | |
| 23 | *IBM view* |
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| 24 | http://www.linux-kvm.org/wiki/images/7/72/2011-forum-keep-a-limit-on-it-io-throttling-in-qemu.pdf |