dm-cache-status

#!/bin/bash
# $Id: dm-cache-status,v 1.1 2014/08/19 09:02:46 oernii Exp $

# Status
#  ------
#
#  <metadata block size> <#used metadata blocks>/<#total metadata blocks>
#  <cache block size> <#used cache blocks>/<#total cache blocks>
#  <#read hits> <#read misses> <#write hits> <#write misses>
#  <#demotions> <#promotions> <#dirty> <#features> <features>*
#  <#core args> <core args>* <policy name> <#policy args> <policy args>*
#
#  metadata block size   : Fixed block size for each metadata block in
#                            sectors
#  #used metadata blocks         : Number of metadata blocks used
#  #total metadata blocks        : Total number of metadata blocks
#  cache block size      : Configurable block size for the cache device
#                            in sectors
#  #used cache blocks    : Number of blocks resident in the cache
#  #total cache blocks   : Total number of cache blocks
#  #read hits            : Number of times a READ bio has been mapped
#                            to the cache
#  #read misses          : Number of times a READ bio has been mapped
#                            to the origin
#  #write hits           : Number of times a WRITE bio has been mapped
#                            to the cache
#  #write misses                 : Number of times a WRITE bio has been
#                            mapped to the origin
#  #demotions            : Number of times a block has been removed
#                            from the cache
#  #promotions           : Number of times a block has been moved to
#                            the cache
#  #dirty                        : Number of blocks in the cache that differ
#                            from the origin
#  #feature args                 : Number of feature args to follow
#  feature args          : 'writethrough' (optional)
#  #core args            : Number of core arguments (must be even)
#  core args             : Key/value pairs for tuning the core
#                            e.g. migration_threshold
#  policy name           : Name of the policy
#  #policy args          : Number of policy arguments to follow (must be even)
#  policy args           : Key/value pairs
#                            e.g. sequential_threshold

pool=${1:-rhel-BigCachedPool}

line=`dmsetup status $pool`
arrIN=(${line/ / })

let count=3
echo -n "<metadata block size>            :"
echo ${arrIN[$count]}; let count++
echo -n "<#used metadata blocks>/<#total> :"
echo "${arrIN[$count]} [$(echo "scale=3; ${arrIN[$count]}*100"|bc)%]"; let count++


echo -n "<cache block size>               :"
echo ${arrIN[$count]}; let count++
echo -n "<#used cache blocks>/<#total>    :"
echo "${arrIN[$count]} [$(echo "scale=3; ${arrIN[$count]}*100"|bc)%]"; let count++


echo -n "<#read hits>                     :"
hits=${arrIN[$count]}
echo ${arrIN[$count]}; let count++
echo -n "<#read misses>                   :"
echo "${arrIN[$count]} [$(echo "scale=3; $hits/${arrIN[$count]}*100"|bc)%]"; let count++

echo -n "<#write hits>                    :"
hits=${arrIN[$count]}
echo ${arrIN[$count]}; let count++
echo -n "<#write misses>                  :"
echo "${arrIN[$count]} [$(echo "scale=3; $hits/${arrIN[$count]}*100"|bc)%]"; let count++

echo -n "<#demotions>                     :"
echo ${arrIN[$count]}; let count++
echo -n "<#promotions>                    :"
echo ${arrIN[$count]}; let count++
echo -n "<#dirty>                         :"
echo ${arrIN[$count]}; let count++


echo -n "<#features>                      :"
let loop=${arrIN[$count]}
echo ${arrIN[$count]}; let count++

for x in `seq 1 $loop`;
do
echo -n "  <features>*                    :"
echo ${arrIN[$count]}; let count++
done


echo -n "<#core args>                     :"
let loop=${arrIN[$count]}
echo ${arrIN[$count]}; let count++

for x in `seq 1 $loop`;
do
echo -n "  <core args>*                   :"
echo ${arrIN[$count]}; let count++
done


echo -n "<policy name>                    :"
echo ${arrIN[$count]}; let count++

echo -n "<#policy args>                   :"
let loop=${arrIN[$count]}
echo ${arrIN[$count]}; let count++

for x in `seq 1 $loop`;
do
echo -n "  <policy args>*                 :"
echo ${arrIN[$count]}; let count++
done