diff --git a/scripts/index-sync-rotate.sh b/scripts/index-sync-rotate.sh
index bc08c669..034f137f 100755
--- a/scripts/index-sync-rotate.sh
+++ b/scripts/index-sync-rotate.sh
@@ -39,7 +39,8 @@ SPHINX_FILE_EXTENSIONS=('spa' 'spd' 'spe' 'sph' 'spi' 'spk' 'spm' 'spp' 'sps')
 SPHINX_INDEX_READY=('spd' 'spe' 'sph' 'spi' 'spp' 'sps')
 SPHINX_INDEXES=$(grep -E "^[^#]+ path" "${SPHINXCONFIG}" | awk -F"=" '{print $2}' | sed -n -e 's|^.*/||p')
 
-LOCKFILE="/var/lock/$(basename "$0")"
+# global locking, no parallel syncing from efs into docker volumes
+LOCKFILE="${SPHINX_EFS}$(basename "$0")"
 LOCKFD=99
 
 # PRIVATE
@@ -114,61 +115,40 @@ for sphinx_index in ${SPHINX_INDEXES[@]}; do
     check_if_index_is_ready "${sphinx_index}" || { echo "${LOG_PREFIX}-> $(date +"%F %T") skipping partially updated index: ${sphinx_index} ..."; continue; }
 
     # sync EFS to VOLUME
-    # do not delete anything in local volume, in case the efs has been cleaned / removed indexes will still exist in local storage
-    echo "${LOG_PREFIX}-> $(date +"%F %T") start sync: ${sphinx_index} ..."
-    rsync --update -av --include-from "${RSYNC_INCLUDE}" --exclude '*' ${SPHINX_EFS} ${SPHINX_VOLUME}
-
-    # rename new files from *.sp* to .*.new.sp*
-    echo "${LOG_PREFIX}-> $(date +"%F %T") rename already rotated, new index files: ${new_files[*]}..."
-    # strip file extension from filename and expand it to the full list of existing files in SPHINX Volume
-    pushd "${SPHINX_VOLUME}"
+    echo "${LOG_PREFIX}-> $(date +"%F %T") start sync and rename files in target folder: ${sphinx_index} ..."
     tmp_array=()
-    for new_file in "${new_files[@]}";do
-        # skip empty elements
-        [[ -z ${new_file} ]] && continue
-        # skip names with *.new.* in it
-        [[ "${new_file}" == *.new.* ]] && continue
-        base=${new_file%.*}
-        tmp_array+=("${base}"*)
-    done
+
+    while IFS= read -r -d '' new_file; do
+        new_file=$(basename "${new_file}")
+        # shellcheck disable=2001
+        new_file_renamed=$(sed 's/\.sp\(\w\)$/.new.sp\1/' <<< "${new_file}")
+        cp -fa "${SPHINX_EFS}${new_file}" "${SPHINX_VOLUME}${new_file_renamed}"
+        tmp_array+=("${new_file_renamed}")
+    done <   <(find "${SPHINX_EFS}" -name "${sphinx_index}*" -print0)
+
     if ((${#tmp_array[@]})); then
-        mapfile -t local_new_files < <(printf "%s\\n" "${tmp_array[@]}" | sort -u | tr '\n' ' ')
-        for rotated in ${local_new_files[@]}; do # shellcheck disable=SC2068
-            # skip empty elements
-            [[ -z ${rotated} ]] && continue
-            # skip names with *.new.* in it
-            [[ "${rotated}" == *.new.* ]] && continue
-            base=${rotated%.*}
-            extension=${rotated##*.}
-            new_file="${base}.new.${extension}"
-            mv -f "${rotated}" "${new_file}"
-            new_files_merged+=("${new_file}")
-        done
+        # remove blank strings from array
+        IFS=" " read -r -a new_files_merged <<< ${tmp_array[@]}
+        if ((${#new_files_merged[@]})); then
+            # start index rotation
+            echo "${LOG_PREFIX}-> $(date +"%F %T") restart searchd for index rotation..."
+            pkill -1 searchd
+
+            # wait until all files new_files and locally renamed files have been renamed / rotated in SPHINX_VOLUME
+            echo "${LOG_PREFIX}-> $(date +"%F %T") wait for index rotation..."
+            all_files_are_gone=false
+            while ! ${all_files_are_gone}; do
+                all_files_are_gone=true
+                for new_file in ${new_files_merged[@]}; do
+                    # skip empty elements
+                    [[ -z ${new_file} ]] && continue
+                    [ -f "${SPHINX_VOLUME}${new_file}" ] && all_files_are_gone=false
+                done
+                sleep 5
+            done
+        fi
     fi
-    popd
 done
 
-# remove duplicates from array with new index files
-mapfile -t new_files_merged < <(printf "%s\\n" "${new_files_merged[@]}" | sort -u | tr '\n' ' ')
-# remove blank strings from array
-IFS=" " read -r -a new_files_merged <<< ${new_files_merged[@]}
-if ((${#new_files_merged[@]})); then
-    # start index rotation if new files have been synced
-    echo "${LOG_PREFIX}-> $(date +"%F %T") restart searchd for index rotation..."
-    pkill -1 searchd
-
-    # wait until all files new_files and locally renamed files have been renamed / rotated in SPHINX_VOLUME
-    echo "${LOG_PREFIX}-> $(date +"%F %T") wait for index rotation..."
-    all_files_are_gone=false
-    while ! ${all_files_are_gone}; do
-        all_files_are_gone=true
-        for new_file in ${new_files_merged[@]}; do
-            # skip empty elements
-            [[ -z ${new_file} ]] && continue
-            [ -f "${SPHINX_VOLUME}${new_file}" ] && all_files_are_gone=false
-        done
-        sleep 5
-    done
-fi
 
 echo "${LOG_PREFIX}-> $(date +"%F %T") finished"
\ No newline at end of file