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vmstatとかiostatを見やすくtailしたい

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トラブル時に忘れるのでメモ。

vmstatは横に長いです。特に複数サーバのvmstatを一括で見たいときには邪魔なので、以下のようなワンライナーを使っています。

vmstat.sh
$ vmstat 1 | egrep --line-buffered "^ +[0-9]" | awk '{OFS=""; print "r=",$1," us=",$13," sy=",$14; fflush()}'

r=2 us=0 sy=0
r=0 us=1 sy=0
r=0 us=1 sy=1
r=0 us=1 sy=0

いっそそのままCSVにしちゃってもよいでしょう。

vmstatcsv.sh
$ echo "r,us,sy"; vmstat 1 | egrep --line-buffered "^ +[0-9]" | awk '{OFS=","; print $1,$13,$14; fflush()}'

r,us,sy
2,0,0
0,1,0
0,1,1

iostatは縦にも横にも長いです。特定デバイスのr/s, w/sだけ見たいときには、以下のようにやっています。

iostat.sh
$ iostat -xd 1 | egrep --line-buffered "Device|xvda[0-9]" | awk '{OFS=""; ORS=""; if ($1=="Device:") print "\n"; else print $1,"=",$4,"|",$5," "; fflush()}'

xvda1=0.00|0.00 xvda2=0.00|0.00 xvda3=0.36|14.02
xvda1=0.00|0.00 xvda2=0.00|0.00 xvda3=0.00|0.00
xvda1=0.00|0.00 xvda2=0.00|0.00 xvda3=0.00|20.00
xvda1=0.00|0.00 xvda2=0.00|0.00 xvda3=0.00|0.00
xvda1=0.00|0.00 xvda2=0.00|0.00 xvda3=0.00|0.00
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