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ZFS/spinup.sh

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+#!/bin/bash
+
+# spin up drives faster ?
+# http://www.admin-magazine.com/HPC/Articles/GNU-Parallel-Multicore-at-the-Command-Line-with-GNU-Parallel
+# http://www.gnu.org/software/parallel/parallel_tutorial.html#Building-the-command-line
+
+logger "BOOJUM note - spinning up disks $0"
+logfile=~/spinup.log
+
+echo "`date` - boojum spinup called - spinning up disks" >> $logfile
+
+infile=/run/shm/paratmp.list
+> $infile # clearit
+
+# exec to use
+para=/usr/bin/parallel
+
+# populate list of drives - REF: http://unix.stackexchange.com/questions/132126/which-command-to-force-a-drive-to-spin-up
+# TODO random seek - 1-100 RND
+# random REF: https://stackoverflow.com/questions/8988824/generating-random-number-between-1-and-10-in-bash-shell-script
+for c in /dev/sd?; do 
+  myrand=$(( ( RANDOM % 100 )  + 1 ))
+  mycmd="echo $c;/bin/dd if=$c of=/dev/null bs=4096 skip=$myrand  count=1 iflag=direct" 
+  echo "$mycmd" >> $infile
+#  `$mycmd &`
+done
+ 
+#jobs
+#limitt=6
+limitt=5
+
+#cat $infile |$para -j $limitt --progress --keep-order --group --linebuffer --results $paradir  qpbatch 
+#cat $infile |$para -j $limitt --progress fdisk -l $1 
+#|grep Disk
+
+date1=`date +%s` # seconds
+time cat $infile |$para  -j $limitt --progress 
+wait;
+date2=`date +%s` # seconds
+let date3=$date2-$date1
+echo "`date` + spinup took ($date3) seconds" >> $logfile
+
+#/bin/dd if=$1 of=/dev/null bs=4096 count=1 iflag=direct 
+
+# combine lines of output for brevity
+# REF: https://stackoverflow.com/questions/9605232/how-to-merge-every-two-lines-into-one-from-the-command-line
+#/root/bin/hd-power-status |awk 'NR%2{printf "%s ",$0;next;}1' 
+/root/bin/hd-power-status 
+
+#echo 'o DONE: '`date` #>> ~/$outlog
+
+exit;
+