Initial recode of output to iostat style

- Initial recode of output to iostat style
- change from hardcoded target to command-line argument: lvmcachestat VG/LV

Author: poddmo

lvmcachestat

@@ -1,7 +1,6 @@
 #!/bin/bash 
 #
-# lvmcache-statistics.sh displays the LVM cache statistics
-# in a user friendly manner
+# lvmcachestat displays the LVM cache statistics in the iostat style
 #
 # Copyright (C) 2014 Armin Hammer 
 #
@@ -19,16 +18,27 @@
 # with this program. If not, see http://www.gnu.org/licenses/.
 #
 # History:
-# 20141220 hammerar, initial version
+# 20141220: hammerar: initial version
+# 20161230: rocketraman: Fix core and policy args count
+# 20230309: poddmo: rename to lvmcachestat.  Begin to recode the output in
+# the style of iostat
+#
+#
 #
 ##################################################################
 set -o nounset
 
-LVCACHED=/dev/vg00/lvol0
+## create list of logical volumes to report
+# from command line arguments otherwise lvs | grep cache 
+
+LVCACHED="$1"
+
 
+## poll for logical volume details
 RESULT=$(dmsetup status ${LVCACHED})
 if [ $? -ne 0 ]; then
-  echo "Unsuccessfull readout of <${LVCACHED}>! Abort...!"
+  echo "Unsuccessful readout of ${LVCACHED}"
+  echo "Usage: lvmcachestat VG/LV"
   exit 1
 fi
 
@@ -80,11 +90,11 @@ CoreArgs=""
 
 if [ ${NrCoreArgs} -ne 0 ]; then
 
-  for ITEM in $(seq $((INDEX+1)) $((2*NrCoreArgs+INDEX)) ); do
+  for ITEM in $(seq $((INDEX+1)) $((NrCoreArgs+INDEX)) ); do
      CoreArgs="${CoreArgs}${RESULTS[${ITEM}]} "
   done
 
-  INDEX=$((INDEX+2*NrCoreArgs))
+  INDEX=$((INDEX+NrCoreArgs))
 fi
 
 INDEX=$((INDEX+1))
@@ -95,29 +105,33 @@ PolicyArgs=""
 
 if [ ${NrPolicyArgs} -ne 0 ]; then
 
-  for ITEM in $(seq $((INDEX+1)) $((2*NrPolicyArgs+INDEX)) ); do
+  for ITEM in $(seq $((INDEX+1)) $((NrPolicyArgs+INDEX)) ); do
      PolicyArgs="${PolicyArgs}${RESULTS[${ITEM}]} "
   done
 
-  INDEX=$((INDEX+2*NrPolicyArgs))
+  INDEX=$((INDEX+NrPolicyArgs))
 fi
 
 ##################################################################
 # human friendly output
 ##################################################################
-echo "------------------------------------"
-echo "LVM Cache report of ${LVCACHED}"
-echo "------------------------------------"
+#echo "------------------------------------"
+#echo "LVM Cache report of ${LVCACHED}"
+#echo "------------------------------------"
 
 MetaUsage=$( echo "scale=1;($NrUsedMetadataBlocks * 100) / $NrTotalMetadataBlocks" | bc)
 CacheUsage=$( echo "scale=1;($NrUsedCacheBlocks * 100) / $NrTotalCacheBlocks" | bc)
-echo "- Cache Usage: ${CacheUsage}% - Metadata Usage: ${MetaUsage}%"
+#echo "- Cache Usage: ${CacheUsage}% - Metadata Usage: ${MetaUsage}%"
 
 ReadRate=$( echo "scale=1;($NrReadHits * 100) / ($NrReadMisses + $NrReadHits)" | bc)
 WriteRate=$( echo "scale=1;($NrWriteHits * 100) / ($NrWriteMisses + $NrWriteHits)" | bc)
-echo "- Read Hit Rate: ${ReadRate}% - Write Hit Rate: ${WriteRate}%"
-echo "- Demotions/Promotions/Dirty: ${NrDemotions}/${NrPromotions}/${NrDirty}"
-echo "- Features in use: ${FeatureArgs}"
+#echo "- Read Hit Rate: ${ReadRate}% - Write Hit Rate: ${WriteRate}%"
+#echo "- Demotions/Promotions/Dirty: ${NrDemotions}/${NrPromotions}/${NrDirty}"
+#echo "- Features in use: ${FeatureArgs}"
+
+##################################################################
+# iostat style output
+##################################################################
 
-#### EOF #########################################################
+echo "${LVCACHED} CacheUsage:${CacheUsage}% MetaUsage:${MetaUsage}% ReadHitRate:${ReadRate}% WriteHitRate:${WriteRate}% DPD:${NrDemotions}/${NrPromotions}/${NrDirty}"