1.1 Aix iostat命令解析

1.1.1 概述

1.1.2 命令報(bào)告及其輸出

1.1.2.1 確定磁盤使用率

$ iostat -T 2 10<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

System configuration: lcpu=8 drives=29 paths=52 vdisks=0

tty:????? tin???????? tout??? avg-cpu: % user % sys % idle % iowait? time

????????? 0.0??????? 377.0?????????????? 77.6?? 6.1?? 16.2????? 0.1? 11:35:45

Disks:??????? % tm_act???? Kbps????? tps??? Kb_read?? Kb_wrtn? time

hdisk5????????? 78.0???? 6080.0???? 439.0????? 12048?????? 112? 11:35:45

hdisk4????????? 79.5???? 11856.5???? 453.5????? 23564?????? 149? 11:35:45

hdisk6????????? 19.0???? 1664.0????? 13.0?????? 3328???????? 0? 11:35:45

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% tm_act ?物理磁盤活動的時(shí)間百分比

KBPS ??某塊磁盤傳輸數(shù)據(jù)的總量（讀或?qū)?#xff09;

tps ??某塊物理磁盤每秒鐘 IO 傳輸?shù)臄?shù)量

Kb_read ?從磁盤上讀取數(shù)據(jù)的總量

Kb_wrtn ?寫入磁盤的數(shù)據(jù)總量

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如果 %tm_act 字段顯示磁盤非常忙，并且 Kbps 字段顯示持續(xù)的大量數(shù)據(jù)傳輸,應(yīng)考慮散布數(shù)據(jù)跨越多個(gè)磁盤。該命令支持動態(tài)的配置改變。如果發(fā)現(xiàn)到配置改變，iostat 報(bào)告發(fā)出一個(gè)警告，并刷新最新的系統(tǒng)配置。其中% tm_act是指活動時(shí)間,kbps是在統(tǒng)計(jì)時(shí)間內(nèi)所有Kb_read與Kb_wrtn之和除以時(shí)間的值，即每秒傳輸?shù)淖止?jié)數(shù)如果% tm_act常過70%卻只有很低的Kbps，系統(tǒng)可能是有比較多的LV碎片或文件碎片，當(dāng)都高時(shí)則系統(tǒng)正常。tps表示每秒的IO數(shù)，不同的磁盤系統(tǒng)其可承受的IO數(shù)不同。如果一塊磁盤的活動率超過70%，可以通過轉(zhuǎn)移一部分的磁盤活動壓力到另一個(gè)磁盤上，或者通過多個(gè)磁盤驅(qū)動器來擴(kuò)展I/O壓力來獲得更高的性能。

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$ iostat -D hdisk0 (查看某一磁盤的情況)

System configuration: lcpu=8 drives=29 paths=52 vdisks=0

hdisk0??xfer:? %tm_act????? bps????? tps????? bread????? bwrtn???

???????????????????????? 4.6???? 58.3K???? 8.8?????? 16.5K????? 41.9K

?????????read:????? rps? avgserv? minserv? maxserv?? timeouts????? fails

???????????????????????? 3.5????? 5.8????? 0.3???? 67.8?????????? 0????????? 0

??????write:????? wps? avgserv? minserv? maxserv?? timeouts????? fails

???????????????????????? 5.3???? 11.2????? 0.6??? 114.9?????????? 0????????? 0

?queue:? avgtime? mintime? maxtime? avgwqsz??? avgsqsz???? sqfull

?????????????????????? 136.8????? 0.0??? 388.4????? 0.2??????? 0.0???????? 3.8

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如果使用啟用多路徑 I/O ［multi-path input-output (MPIO)］的設(shè)備，可使用 iostat -m 命令顯示每條相關(guān)路徑的統(tǒng)計(jì)信息。

$ iostat -m -D hdisk6

System configuration: lcpu=8 drives=29 paths=52 vdisks=0

hdisk6?? xfer:? %tm_act????? bps????? tps????? bread????? bwrtn???

???????????????????????? 3.4??? 286.7K??? 28.6????? 285.3K?????? 1.4K

?????read:????? rps? avgserv? minserv? maxserv?? timeouts????? fails

??????????????????????? 28.5????? 1.9????? 0.1??? 383.4?????????? 0????????? 0

?????write:????? wps? avgserv? minserv? maxserv?? timeouts????? fails

???????????????????????? 0.1????? 4.5????? 0.2???? 94.3?????????? 0????????? 0

?queue:? avgtime? mintime? maxtime? avgwqsz??? avgsqsz???? sqfull

???????????????????????? 0.9????? 0.0??? 326.3????? 0.0??????? 0.0??????? 21.0

Path1??????xfer:? %tm_act????? bps????? tps????? bread????? bwrtn???

???????????????????????? 3.4??? 286.7K??? 28.6????? 285.3K?????? 1.4K

Path0???? xfer:? %tm_act????? bps????? tps????? bread????? bwrtn???

???????????????????????? 0.0????? 0.0????? 0.0??????? 0.0??????? 0.0

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1.1.2.2 確定CPU使用情況

$ iostat 2

System configuration: lcpu=8 drives=29 paths=52 vdisks=0

tty:????? tin???????? tout??? avg-cpu: % user % sys % idle % iowait

????????? 0.0??????? 354.5?????????????? 79.4?? 4.6?? 15.9????? 0.0

......

......

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tin ?系統(tǒng)從所有 ttys 讀取的字符的總數(shù)

tout ?系統(tǒng)寫到所有 ttys 的字符的總數(shù)

%user ?以用戶模式執(zhí)行 CPU 利用率的百分比

%sys ?以內(nèi)核模式執(zhí)行 CPU 利用率的百分比

%idle ?CPU 空閑時(shí)間的百分比，系統(tǒng)沒有未解決的磁盤 I/O 請求

%iowait CPU 空閑時(shí)間的百分比，期間，系統(tǒng)有未解決的磁盤 I/O 請求

%physc 消耗物理 CPU 的百分比，只在運(yùn)行共享處理器的分區(qū)顯示

%entc ?消耗分配容量的百分比，只在運(yùn)行共享處理器的分區(qū)顯示

1.1.2.3 異步IO

$ iostat -A

System configuration: lcpu=8 drives=29 paths=52 vdisks=0

aio: avgc avfc maxg maif maxr???

??????? 0??? 0??? 0?? 22 4096

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avgc ?指定時(shí)間間隔內(nèi)，每秒平均全局 non-fast 路徑 AIO 請求計(jì)數(shù)

avfc ?指定埋單間隔內(nèi)，每秒平均全局 AIO fast 路徑請求計(jì)數(shù)

maxg ?自最后一次取值以來，最大的全局 non-fast 路徑 AIO 請求計(jì)數(shù)

maxf ?自最后一次取值以來，最大 fast 路徑請求計(jì)數(shù)

maxr ?容許的最大 AIO 請求。這是 AIO 設(shè)備的 maxreqs 屬性

1.1.2.4 確定適配器的利用率

$ iostat -a System configuration: lcpu=8 drives=29 paths=52 vdisks=0 tty:????? tin???????? tout??? avg-cpu: % user % sys % idle % iowait ????? ?0.0???????? 12.6?????????????? 13.5?? 2.2?? 83.4????? 0.8 Adapter:?????????????????? Kbps????? tps??? Kb_read?? Kb_wrtn fcs0?????????????????????? 0.0?????? 0.0??????? 180???????? 0 Disks:????? % tm_act???? Kbps????? tps??? Kb_read?? Kb_wrtn hdisk8???? 　　0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk9???? ???　0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk18?????? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk5?????? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk11???? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk10????? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk12???? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk16????? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk13????? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk14????? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk19???? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk4????? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk7???? 0.0?????? 0.0?????? 0.0??????? 180???????? 0 hdisk20??? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk15????? 0.0?????? 0.0??? ???0.0????????? 0???????? 0 hdisk22???? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk24??? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk17???? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk6???? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk21???? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk23??? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk25?? 　0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk26??? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk27??? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 Adapter:?? Kbps????? tps??? Kb_read?? Kb_wrtn sisscsia0? 1037.2????? 24.0?? 853190413? 2792786844 Disks:??? % tm_act???? Kbps????? tps??? Kb_read?? Kb_wrtn hdisk2?? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk1?? 2.9????? 43.1?????? 5.9??? 7601140? 143758376 hdisk0?? 4.6????? 57.0?????? 8.8?? 56471864? 143758376 hdisk3?? 3.6???? 937.2?????? 9.4? ?789117409? 2505270092 Adapter: 　Kbps????? tps??? Kb_read?? Kb_wrtn ide0?????? 0.0?????? 0.0????????? 0???????? 0 Disks:??? % tm_act???? Kbps????? tps??? Kb_read?? Kb_wrtn cd0???? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 Adapter:? Kbps????? tps??? Kb_read?? Kb_wrtn fcs1??? 1753.6???? 141.4?? 5991841616? 172643922 Disks:? % tm_act???? Kbps????? tps??? Kb_read?? Kb_wrtn hdisk8? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk9 　0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk18? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk5?? 7.9???? 761.6????? 69.1?? 2654793648? 22544736 hdisk11? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk10? 0.0????? 58.5?????? 0.2?? 205481199???????? 0 hdisk12? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk16? 0.0? ????59.9?????? 0.3?? 210289843??? 108792 hdisk13? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk14? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk19? 0.0?????? 0.0?????? 0.0????????? 0???????? 0 hdisk4?? 5.8???? 593.5????? 43.2?? 1941265217? 145036858 hdisk7? 0.0?????? 0.0?????? 0.0????????? 0???????? 0hdisk20 　0.0?????? 0.0?????? 0.0????????? 0???????? 0

轉(zhuǎn)載于:https://blog.51cto.com/williamwu/130019

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