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ecaccf764a
Sometimes, for reasons I haven't looked into yet, VDEV_UPATH gets set to /dev/(null), breaking all these scripts. It'd be nice to have a fallback case to avoid total failure. Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rich Ercolani <rincebrain@gmail.com> Closes #13436
87 lines
2.1 KiB
Bash
Executable File
87 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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#
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# Display most relevant iostat bandwidth/latency numbers. The output is
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# dependent on the name of the script/symlink used to call it.
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#
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helpstr="
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iostat: Show iostat values since boot (summary page).
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iostat-1s: Do a single 1-second iostat sample and show values.
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iostat-10s: Do a single 10-second iostat sample and show values."
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script="${0##*/}"
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if [ "$1" = "-h" ] ; then
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echo "$helpstr" | grep "$script:" | tr -s '\t' | cut -f 2-
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exit
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fi
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# Sometimes, UPATH ends up /dev/(null).
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# That should be corrected, but for now...
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# shellcheck disable=SC2154
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if [ ! -b "$VDEV_UPATH" ]; then
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somepath="${VDEV_PATH}"
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else
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somepath="${VDEV_UPATH}"
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fi
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if [ "$script" = "iostat-1s" ] ; then
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# Do a single one-second sample
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interval=1
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# Don't show summary stats
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brief="yes"
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elif [ "$script" = "iostat-10s" ] ; then
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# Do a single ten-second sample
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interval=10
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# Don't show summary stats
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brief="yes"
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fi
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if [ -f "$somepath" ] ; then
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# We're a file-based vdev, iostat doesn't work on us. Do nothing.
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exit
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fi
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if [ "$(uname)" = "FreeBSD" ]; then
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out=$(iostat -dKx \
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${interval:+"-w $interval"} \
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${interval:+"-c 1"} \
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"$somepath" | tail -n 2)
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else
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out=$(iostat -kx \
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${brief:+"-y"} \
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${interval:+"$interval"} \
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${interval:+"1"} \
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"$somepath" | grep -v '^$' | tail -n 2)
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fi
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# Sample output (we want the last two lines):
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#
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# Linux 2.6.32-642.13.1.el6.x86_64 (centos68) 03/09/2017 _x86_64_ (6 CPU)
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#
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# avg-cpu: %user %nice %system %iowait %steal %idle
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# 0.00 0.00 0.00 0.00 0.00 100.00
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#
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# Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
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# sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
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#
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# Get the column names
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cols=$(echo "$out" | head -n 1)
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# Get the values and tab separate them to make them cut-able.
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vals=$(echo "$out" | tail -n 1 | tr -s '[:space:]' '\t')
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i=0
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for col in $cols ; do
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i=$((i+1))
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# Skip the first column since it's just the device name
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if [ "$i" -eq 1 ]; then
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continue
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fi
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# Get i'th value
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val=$(echo "$vals" | cut -f "$i")
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echo "$col=$val"
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done
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