run a simple speed check on the drives of a zpool...

this assume the pool is somewhat quiet and I use this as somewhat
of a proxy of drive health..

zpoolspeedcheck

@@ -0,0 +1,17 @@
+#!/bin/sh -
+
+#echo start
+
+readsize=512
+
+for i in $( zpool list -v ztank | awk '$1 ~ /^label\// { print $1 }' ); do
+	barename="${i%.eli}"
+	i=/dev/${barename}
+	disksizemb=$(diskinfo "$i" | awk '{ print int($3 / 1024 / 1024) }')
+	#echo -n $i
+	inner=$(dd if="$i" bs=1m count="$readsize" of=/dev/null 2>&1 | awk 'END { print substr($7, 2) / 1024 / 1024 }')
+	middle=$(dd if="$i" bs=1m count="$readsize" iseek=$(($disksizemb / 2)) of=/dev/null 2>&1 | awk 'END { print substr($7, 2) / 1024 / 1024 }')
+	outer=$(dd if="$i" bs=1m count="$readsize" iseek=$(($disksizemb - "$readsize")) of=/dev/null 2>&1 | awk 'END { print substr($7, 2) / 1024 / 1024 }')
+	printf "%s\t%s\t%s\t%s\n" ${barename} $inner $middle $outer
+done
+#echo end