iozone测试.doc

原理：假定其他条件都满足，最终影响虚拟机的数量的因素是存储设备的多线程io性能。转化服务器每次读写的数据都比较小。测试：用iozone分别测试ssd和raid上的多线程（最多256个线程）性能。Raid测试步骤和结果：1. 首先用最常用的dd进行初步测试raid写性能 126 MB/sraid读性能 217 MB/s2. iozone 单线程 block=4k filesize=1G （结果单位为KB）write rewrite read reread169401 181377 176716 2152563. iozone 128线程 block=4k filesize=32MChildren see throughput for 128 initial writers = 32333.90 KB/secParent sees throughput for 128 initial writers = 21664.59 KB/secMin throughput per process = 160.18 KB/sec Max throughput per process = 359.49 KB/secAvg throughput per process = 252.61 KB/secMin xfer = 14600.00 KBChildren see throughput for 128 rewriters = 40430.87 KB/secParent sees throughput for 128 rewriters = 39872.60 KB/secMin throughput per process = 98.59 KB/sec Max throughput per process = 600.14 KB/secAvg throughput per process = 315.87 KB/secMin xfer = 5404.00 KBChildren see throughput for 128 readers = 48348.60 KB/secParent sees throughput for 128 readers = 48087.32 KB/secMin throughput per process = 319.75 KB/sec Max throughput per process = 420.09 KB/secAvg throughput per process = 377.72 KB/secMin xfer = 24944.00 KBChildren see throughput for 128 re-readers = 47944.65 KB/secParent sees throughput for 128 re-readers = 47633.69 KB/secMin throughput per process = 342.37 KB/sec Max throughput per process = 419.65 KB/secAvg throughput per process = 374.57 KB/sec Min xfer = 26992.00 KB4. iozone 256线程 block=4k filesize=32MChildren see throughput for 256 initial writers = 24535.30 KB/secParent sees throughput for 256 initial writers = 14750.82 KB/secMin throughput per process = 41.96 KB/sec Max throughput per process = 166.23 KB/secAvg throughput per process = 95.84 KB/secMin xfer = 8276.00 KBChildren see throughput for 256 rewriters = 28527.67 KB/secParent sees throughput for 256 rewriters = 27356.49 KB/secMin throughput per process = 18.62 KB/sec Max throughput per process = 297.63 KB/secAvg throughput per process = 111.44 KB/secMin xfer = 2052.00 KBChildren see throughput for 256 readers = 53807.49 KB/secParent sees throughput for 256 readers = 53489.86 KB/secMin throughput per process = 183.62 KB/sec Max throughput per process = 232.03 KB/secAvg throughput per process = 210.19 KB/secMin xfer = 25984.00 KBChildren see throughput for 256 re-readers = 57328.90 KB/secParent sees throughput for 256 re-readers = 56990.59 KB/secMin throughput per process = 195.81 KB/sec Max throughput per process = 244.42 KB/secAvg throughput per process = 223.94 KB/sec Min xfer = 26480.00 KBRaid测试结论：单线程下，dd和iozone的测试结果基本保持一致，iozone的测试结果偏低。128线程下，写性能下降为单线程下的19% （32333.90/169401），读性能下降为单线程下的27%（48348.60/176716）。256线程下，写性能下降为单线程下的14%，读性能下降为单线程下的30%。由以上数据可知，raid在128线程和256线程下的测试结果相差不多。Ssd测试步骤和结果：1. 首先用最常用的dd进行初步测试ssd写性能 183 MB/sssd读性能 256 MB/s2. iozone 单线程 block=4k filesize=1G （结果单位为KB）write rewrite read reread192177 193676 234402 2343993. iozone 128线程 block=4k filesize=32MChildren see throughput for 128 initial writers = 176755.63 KB/secParent sees throughput for 128 initial writers = 160977.03 KB/secMin throughput per process = 1258.82 KB/sec Max throughput per process = 1489.52 KB/secAvg throughput per process = 1380.90 KB/secMin xfer = 27664.00 KBChildren see throughput for 128 rewriters = 169998.51 KB/secParent sees throughput for 128 rewriters = 167383.68 KB/secMin throughput per process = 1253.30 KB/sec Max throughput per process = 1523.10 KB/secAvg throughput per process = 1328.11 KB/secMin xfer = 26920.00 KBChildren see throughput for 128 readers = 165630.03 KB/secParent sees throughput for 128 readers = 162813.45 KB/secMin throughput per process = 96.87 KB/sec Max throughput per process = 4875.99 KB/secAvg throughput per process = 1293.98 KB/secMin xfer = 664.00 KBChildren see throughput for 128 re-readers = 130379.10 KB/secParent sees throughput for 128 re-readers = 127966.45 KB/secMin throughput per process = 5.69 KB/sec Max throughput per process = 3952.83 KB/secAvg throughput per process = 1018.59 KB/sec Min xfer = 48.00 KB4. iozone 256线程 block=4k filesize=32MChildren see throughput for 256 initial writers = 171466.63 KB/secParent sees throughput for 256 initial writers = 138481.41 KB/secMin throughput per process = 605.70 KB/sec Max throughput per process = 808.79 KB/secAvg throughput per process = 669.79 KB/secMin xfer = 24524.00 KBChildren see throughput for 256 rewriters = 168769.70 KB/secParent sees throughput for 256 rewriters = 167068.48 KB/secMin throughput per process = 632.54 KB/sec Max throughput per process = 736.14 KB/secAvg throughput per process = 659.26 KB/secMin xfer = 28136.00 KBChildren see throughput for 256 readers = 139866.41 KB/secParent sees throughput for 256 readers = 137362.25 KB/secMin throughput per process = 90.94 KB/sec Max throughput per process = 1777.83 KB/secAvg throughput per process = 546.35 KB/secMin xfer = 1712.00 KBChildren see throughput for 256 re-readers = 142891.99 KB/secParent sees throughput for 256 re-readers = 138610.69 KB/secMin throughput per process = 34.29 KB/sec Max throughput per process = 2673.81 KB/secAvg throughput per process = 558.17 KB/sec Min xfer = 432.00 KBSsd测试结论：Ssd在单线程和多线程测试下，性能相差不大，在128线程和256线程的测试中，数据也相差不大。总结：Raid5的性能和组内硬盘