iops主要用在数据方面，这个指标是数据库性能评定的一个重要参考，iops的是每秒进行读写（I/O）操作的次数，主要看随机访问的性能，一般为了iops增高都要依靠磁盘阵列，实际线上的数据库基本都是raid10的配置，raid5在实际生产环境中如果压力上来是抗不住的，当然也要开具体业务压力情况，如果是用物理机就要看iops在实际中能跑到多少值，现在云也普遍了，如果你用的RDS云数据库，这个iops是可以根据业务情况自己选择的，基本是个参数，可以按需进行修改，当然数值越大费用越高

python获得系统iops代码如下：

#!/usr/bin/python

import os, time, math

run_tests = 3

devices = os.listdir('/sys/block/')
check_devices = []

reads = {}
writes = {}

for dev in devices:
 if dev.startswith('md') or dev.startswith('sd') or dev.startswith('hd'):
 check_devices.append(dev)
 reads[dev] = []
 writes[dev] = []

check_devices = sorted(check_devices)

for t in range(run_tests + 1):
 for dev in check_devices:
 file_data = open('/sys/block/%s/stat' % dev).readline().strip().split(' ')
 clean = []
 for num in file_data:
 if num != '':
 clean.append(int(num))

 reads[dev].append(clean[0])
 writes[dev].append(clean[4])
 print reads[dev]
 print writes[dev]

 time.sleep(1)



print "Device Read Write"
print "--------------------------------------"
for dev in check_devices:
 clean_reads = []
 reads[dev].reverse()
 for test, result in enumerate(reads[dev]):
 if test > 0:
 clean_reads.append(float(reads[dev][test - 1] - result))

 rops = int(math.ceil(sum(clean_reads) / len(clean_reads)))

 clean_writes = []
 writes[dev].reverse()
 for test, result in enumerate(writes[dev]):
 if test > 0:
 clean_writes.append(float(writes[dev][test - 1] - result))

 wops = int(math.ceil(sum(clean_writes) / len(clean_writes)))

 print "%s %s %s" % (dev.ljust(13), repr(rops).ljust(11), repr(wops))

总结