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centos7系统默认io-scheduler介绍.html
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centos7系统下磁盘默认io scheduler介绍
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<p>在一次使用fio对磁盘进行iops的测试过程中，通过iostat监控磁盘信息。发现2者显示的iops不一样。根据这个做了以下测试，以及自己的一些推断，非专业，仅供参考。<br><a id="more"></a><br>这里fio 任务 bs=4M 顺序写</p>
<pre><code>[root@node1 ~]# fio --filename=/dev/sdc --name=write-4M --rw=write --ioengine=libaio --bs=4M --numjobs=1 --direct=1 --randrepeat=0 --iodepth=1 --runtime=100 --ramp_time=5 --size=100G --group_reporting
write-4M: (g=0): rw=write, bs=4M-4M/4M-4M/4M-4M, ioengine=libaio, iodepth=1
fio-2.2.5
Starting 1 process
Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/0KB/0KB /s] [0/0/0 iops] [eta 00m:00s]
write-4M: (groupid=0, jobs=1): err= 0: pid=42962: Tue Feb 27 12:19:02 2018
write: io=942080KB, bw=9396.7KB/s, iops=2, runt=100257msec
</code></pre><p>这里看到iops=2 带宽值9.17MB/s</p>
<p>查看同时运行的iostat的数据</p>
<pre><code>Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 1.00 0.00 1024.00 2048.00 3.01 47.00 0.00 47.00 1000.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 14.71 0.00 15058.82 2048.00 3.36 425.00 0.00 425.00 67.80
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 12.75 0.00 13050.98 2048.00 2.94 200.62 0.00 200.62 78.77
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 8.00 0.00 8192.00 2048.00 2.95 155.50 0.00 155.50 124.88
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 4.00 0.00 4096.00 2048.00 3.04 1193.25 0.00 1193.25 250.00
</code></pre><p>这里的w/s每秒写入io数量分别为1 14.71 12.75 8 4 与FIO测试结果值差距很大，且每秒监控w/s值也不相同，这个是为什么呢？</p>
<p><strong>分析：</strong></p>
<p>1、通过avgrp-sz每次IO操作扇区数量均为2048个，通过fdisk查看每个sectors为512byte,合计计算每次IO大小为1024kb。同理计算15058/14.71=1024kb 8192/8=1024 4096/4=1024 .所以这样算来，通过iostat监控到的每次写入磁盘IO大小为1024kb,通过wKB值去除以1024就是当前监控时间磁盘的iops值。同理使用fio对象大小为4M，通过结果值9396KB/1024KB/4M=2.29 结果值显示为2.</p>
<p>2、查看磁盘最大io scheduler </p>
<p>[root@node1 ~]# cat /sys/block/sdc/queue/max_sectors_kb<br>1280</p>
<p>既最大为1280kb，是块运行应用程序单次写入io的最大字节数，通常会小于1280kb，此次为1024kb。</p>
<p>此时通过avgqu-sz 既队列深度查看都是小于4，个人理解4M的对象通过IO调度后分为4个io对象，在iodepth为1的情况下，变相的增加了队列深度。</p>
<p><strong>验证：</strong></p>
<p>1、FIO测试小文件 512kb 1M 对比</p>
<p>1M 对比：</p>
<pre><code>[root@node1 ~]# fio --filename=/dev/sdc --name=write-4M --rw=write --ioengine=libaio --bs=1M --numjobs=1 --direct=1 --randrepeat=0 --iodepth=1 --runtime=100 --ramp_time=5 --size=100G --group_reporting
write-4M: (g=0): rw=write, bs=1M-1M/1M-1M/1M-1M, ioengine=libaio, iodepth=1
fio-2.2.5
Starting 1 process
Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/21418KB/0KB /s] [0/20/0 iops] [eta 00m:00s]
write-4M: (groupid=0, jobs=1): err= 0: pid=56204: Tue Feb 27 13:18:51 2018
</code></pre><p> write: io=2500.0MB, bw=25590KB/s, iops=24, runt=100038msec</p>
<p>FIO结果 bw=25590 除以对象大小1024kb 既IOPS=24.9 与结果相符</p>
<pre><code>Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 41.00 0.00 41984.00 2048.00 1.00 26.12 0.00 26.12 24.32 99.70
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdc 0.00 0.00 0.00 30.00 0.00 30720.00 2048.00 1.00 32.47 0.00 32.47 33.20 99.60
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 36.00 0.00 36864.00 2048.00 0.97 31.06 0.00 31.06 27.03 97.30
</code></pre><p>iostat结果：扇区2048个，既单次io为1M 根据wKB除以1024kb 即为w/s值。此时队列深度均为1</p>
<p>512kb对比：</p>
<pre><code>[root@node1 ~]# fio --filename=/dev/sdc --name=write-4M --rw=write --ioengine=libaio --bs=512kb --numjobs=1 --direct=1 --randrepeat=0 --iodepth=1 --runtime=100 --ramp_time=5 --size=100G --group_reporting
write-4M: (g=0): rw=write, bs=512K-512K/512K-512K/512K-512K, ioengine=libaio, iodepth=1
fio-2.2.5
Starting 1 process
Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/25930KB/0KB /s] [0/50/0 iops] [eta 00m:00s]
write-4M: (groupid=0, jobs=1): err= 0: pid=8421: Tue Feb 27 13:26:02 2018
write: io=1382.0MB, bw=14146KB/s, iops=27, runt=100039msec
</code></pre><p> FIO结果 bw=14146 除以对象大小512kb 既IOPS=27.6 与结果相符</p>
<pre><code>Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 49.00 0.00 25088.00 1024.00 1.00 21.41 0.00 21.41 20.37 99.80
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 51.00 0.00 26112.00 1024.00 0.99 19.53 0.00 19.53 19.39 98.90
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 30.00 0.00 15360.00 1024.00 1.00 31.30 0.00 31.30 33.33 100.00
</code></pre><p>iostat结果：avgrq-sz 扇区数位1024 计算为单次io对象大小为512KB avgqu-sz队列深度也均为1 。结合wKB w/s计算也相符合猜想。</p>
<p>2、通过队列深度对比</p>
<p>fio bs=4M iodepth=16 </p>
<pre><code>[root@node1 ~]# fio --filename=/dev/sdc --name=write-4M --rw=write --ioengine=libaio --bs=4M --numjobs=1 --direct=1 --randrepeat=0 --iodepth=16 --runtime=100 --ramp_time=5 --size=100G --group_reporting
write-4M: (g=0): rw=write, bs=4M-4M/4M-4M/4M-4M, ioengine=libaio, iodepth=16
fio-2.2.5
Starting 1 process
Jobs: 1 (f=0): [W(1)] [11.0% done] [0KB/29218KB/0KB /s] [0/7/0 iops] [eta 14m:33s]
write-4M: (groupid=0, jobs=1): err= 0: pid=25106: Tue Feb 27 13:33:00 2018
write: io=10800MB, bw=108006KB/s, iops=26, runt=102394msec
</code></pre><p>队列深度调到16，相比4M 深度为1的时候 iops值以及bw值均提升了很多，但是await时间也翻倍了许多。这个原因这里就不细讲。</p>
<pre><code>Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 130.69 0.00 133829.70 2048.00 61.90 467.80 0.00 467.80 7.58
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdc 0.00 0.00 0.00 148.00 0.00 151552.00 2048.00 62.57 419.59 0.00 419.59 6.77
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdc 0.00 0.00 0.00 137.00 0.00 140288.00 2048.00 62.35 467.12 0.00 467.12 7.31
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 138.00 0.00 141312.00 2048.00 62.39 459.80 0.00 459.80 7.25
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm
sdc 0.00 0.00 0.00 138.00 0.00 141312.00 2048.00 62.40 422.87 0.00 422.87 7.25
</code></pre><p>看到同样的4M对象大小，扇区数还是2048 既1M对象大小，但是avgqu-sz队列深度均接近于64 符合4M/1*16猜想。</p>
<p><strong>总结：</strong></p>
<p>块设备写入最大io大小当前为1M ，当fio（libaio 异步写）写入对象大小大于1M的时候 根据实际大小除以1M之后的值增加了队列深度，类似同步写中增加了线程数。当应用程序fio写入对象小于1M的时候，对象不会出现split现象。</p>
<p><strong>疑问：</strong></p>
<p>iostat检测每秒wKB/S值为什么都不相同呢？</p>
<p>当应用程序fio写入数据的时候，底层磁盘究竟做了啥？这里我们通过blktrace工具简单的分析下。</p>
<p>一个I/O请求进入block layer之后，可能会经历下面的过程：</p>
<ul>
<li>Remap: 可能被DM(Device Mapper)或MD(Multiple Device, Software RAID) remap到其它设备</li>
<li>Split: 可能会因为I/O请求与扇区边界未对齐、或者size太大而被分拆(split)成多个物理I/O</li>
<li>Merge: 可能会因为与其它I/O请求的物理位置相邻而合并(merge)成一个I/O</li>
<li>被IO Scheduler依照调度策略发送给driver</li>
<li>被driver提交给硬件，经过HBA、电缆（光纤、网线等）、交换机（SAN或网络）、最后到达存储设备，设备完成IO请求之后再把结果发回。</li>
</ul>
<p>blktrace 能够记录下IO所经历的各个步骤。</p>
<p>下面通过fio测试测试4M 对象 512kb对象观察</p>
<p>1、4M对象</p>
<p>开启3个shell窗口：运行fio 运行iostat 运行blktrace跟踪sdc盘</p>
<pre><code>[root@node1 4M]#fio --filename=/dev/sdc --name=write-4M --rw=write --ioengine=libaio --bs=4M --numjobs=1 --direct=1 --randrepeat=0 --iodepth=1 --runtime=100 --ramp_time=5 --size=100G --group_reporting
[root@node1 4M]#iostat -d sdc -x 1
[root@node1 4M]# blktrace -d /dev/sdc
</code></pre><p>当fio运行完成后，ctrl+c结束blktrace进程，当前目录下面会生成已cpu逻辑数的文件，此例为</p>
<p>[root@node1 4M]# ls<br>sdc.blktrace.0 sdc.blktrace.1</p>
<p>格式转换：</p>
<pre><code>blkparse -i sdc -d sdc.blktrace.bin
</code></pre><p>取一段</p>
<pre><code>8,32 1 5084 74.637582891 0 C WS 2516312 + 680 [0]
8,32 1 5085 74.642529579 0 C WS 2516992 + 2048 [0]
8,32 1 5086 74.649161320 0 C WS 2519040 + 2048 [0]
8,32 1 5087 74.652712982 0 C WS 2521088 + 2048 [0]
8,32 1 5088 74.652974507 62470 Q WS 2523136 + 2048 [fio]
8,32 1 5089 74.652978297 62470 Q WS 2524504 + 680 [fio]
8,32 1 5090 74.652980113 62470 G WS 2523136 + 1368 [fio]
8,32 1 5091 74.652980329 62470 P N [fio]
8,32 1 5092 74.652982911 62470 G WS 2524504 + 680 [fio]
8,32 1 5093 74.653007161 62470 Q WS 2525184 + 2048 [fio]
8,32 1 5094 74.653010028 62470 G WS 2525184 + 2048 [fio]
8,32 1 5095 74.653078171 62470 Q WS 2527232 + 2048 [fio]
8,32 1 5096 74.653080948 62470 G WS 2527232 + 2048 [fio]
8,32 1 5097 74.653144055 62470 Q WS 2529280 + 2048 [fio]
8,32 1 5098 74.653146880 62470 G WS 2529280 + 2048 [fio]
8,32 1 5099 74.653149556 62470 I WS 2523136 + 1368 [fio]
8,32 1 5100 74.653149948 62470 I WS 2524504 + 680 [fio]
8,32 1 5101 74.653150068 62470 I WS 2525184 + 2048 [fio]
8,32 1 5102 74.653150198 62470 I WS 2527232 + 2048 [fio]
8,32 1 5103 74.653150307 62470 I WS 2529280 + 2048 [fio]
8,32 1 5104 74.653150650 62470 U N [fio] 5
8,32 1 5105 74.653151147 62470 D WS 2523136 + 1368 [fio]
8,32 1 5106 74.653397635 62470 D WS 2524504 + 680 [fio]
8,32 1 5107 74.653487215 62470 D WS 2525184 + 2048 [fio]
8,32 1 5108 74.653648491 62470 D WS 2527232 + 2048 [fio]
8,32 1 5109 74.653758599 62470 D WS 2529280 + 2048 [fio]
8,32 1 5110 74.800903047 0 C WS 2523136 + 1368 [0]
8,32 1 5111 74.802685792 0 C WS 2524504 + 680 [0]
8,32 1 5112 74.809983551 0 C WS 2525184 + 2048 [0]
8,32 1 5113 74.819413918 0 C WS 2527232 + 2048 [0]
8,32 1 5114 74.826425458 0 C WS 2529280 + 2048 [0]
8,32 1 5115 74.826688212 62470 Q WS 2531328 + 2048 [fio]
</code></pre><p>通过第8列就可以看到每次io大小为2048个扇区，既1M数据。</p>
<p>第6列 G获取IO请求，Q即将生成IO请求。第4列为时间轴，可以看到以秒为单位，通过完整的数据可以看到每秒issued的IO（D 第6列）均不相同，对应iostat中avgrq-sz参数。所以每秒显示值均不同。</p>
<p>2、512kb对象</p>
<pre><code>[root@node1 ~]# fio --filename=/dev/sdc --name=write-4M --rw=write --ioengine=libaio --bs=512kb --numjobs=1 --direct=1 --randrepeat=0 --iodepth=1 --runtime=100 --ramp_time=5 --size=100G --group_reporting
write-4M: (g=0): rw=write, bs=512K-512K/512K-512K/512K-512K, ioengine=libaio, iodepth=1
fio-2.2.5
Starting 1 process
Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/10191KB/0KB /s] [0/19/0 iops] [eta 00m:00s]
write-4M: (groupid=0, jobs=1): err= 0: pid=48327: Tue Feb 27 15:09:04 2018
write: io=1587.0MB, bw=16246KB/s, iops=31, runt=100029msec
</code></pre><p>blktrace数据：</p>
<pre><code>8,32 0 3446 91.662931350 48327 P N [fio]
8,32 0 3447 91.662933867 48327 I WS 3411968 + 1024 [fio]
8,32 0 3448 91.662934452 48327 U N [fio] 1
8,32 0 3449 91.662934974 48327 D WS 3411968 + 1024 [fio]
8,32 0 3450 91.680073252 0 C WS 3411968 + 1024 [0]
8,32 0 3451 91.680180307 48327 Q WS 3412992 + 1024 [fio]
8,32 0 3452 91.680185144 48327 G WS 3412992 + 1024 [fio]
8,32 0 3453 91.680185484 48327 P N [fio]
8,32 0 3454 91.680187957 48327 I WS 3412992 + 1024 [fio]
8,32 0 3455 91.680188632 48327 U N [fio] 1
8,32 0 3456 91.680189506 48327 D WS 3412992 + 1024 [fio]
8,32 0 3457 91.696710693 3360 C WS 3412992 + 1024 [0]
8,32 0 3458 91.696862267 48327 Q WS 3414016 + 1024 [fio]
8,32 0 3459 91.696866413 48327 G WS 3414016 + 1024 [fio]
8,32 0 3460 91.696866983 48327 P N [fio]
8,32 0 3461 91.696869084 48327 I WS 3414016 + 1024 [fio]
8,32 0 3462 91.696869813 48327 U N [fio] 1
8,32 0 3463 91.696870421 48327 D WS 3414016 + 1024 [fio]
8,32 0 3464 91.712655698 2719 C WS 3414016 + 1024 [0]
8,32 1 16995 91.712758397 48327 Q WS 3415040 + 1024 [fio]
8,32 1 16996 91.712763594 48327 G WS 3415040 + 1024 [fio]
8,32 1 16997 91.712763977 48327 P N [fio]
8,32 1 16998 91.712766267 48327 I WS 3415040 + 1024 [fio]
8,32 1 16999 91.712766934 48327 U N [fio] 1
8,32 1 17000 91.712767493 48327 D WS 3415040 + 1024 [fio]
8,32 1 17001 91.735700424 0 C WS 3415040 + 1024 [0]
8,32 1 17002 91.735817163 48327 Q WS 3416064 + 1024 [fio]
8,32 1 17003 91.735821770 48327 G WS 3416064 + 1024 [fio]
8,32 1 17004 91.735822084 48327 P N [fio]
</code></pre><p>可以看出每次io大小为1024个扇区，既512kb。 通过这组数据对比4M数据可以明显的看到一个io生命从Q-C 明显的512kb比较顺畅，io 等待时间明显少很多。</p>
<p>此次测试验证到此完成，关于blktrace部分，个人还不是很熟悉，不作细讲。</p>
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