From: Alan J. Pippin <ajp@pippins.net>
Date: Fri, 12 Oct 2012 03:26:25 +0000 (-0600)
Subject: Major changes from nexenta versions to support running under unbuntu.
X-Git-Url: http://git.pippins.net/embedvideo/.git/%22%22.%24thumbnail.%22/images/%27.%24link.%27?a=commitdiff_plain;h=cc81a4f1a8387e6991eb447383cae05220a65d15;p=zfs-ubuntu%2F.git

Major changes from nexenta versions to support running under unbuntu.
Added ability to replicate from local pool to local backup pool.
Added new option to all import/export of backup pool prior/after replication.
---

diff --git a/zfs-autosnap b/zfs-autosnap
index da650f5..09e1a62 100755
--- a/zfs-autosnap
+++ b/zfs-autosnap
@@ -79,7 +79,7 @@ fi
 # Check to see if this zfs filesystem has a scrub being performed on it now.
 # If it does, we cannot perform any snapshot create or destroy operations.
 if [ -z "$SNAP_UNDER_TEST" ]; then
-    zpool status $pool | grep scrub: | grep "in progress" > /dev/null 2>&1
+    zpool status $pool | grep scan: | grep "in progress" > /dev/null 2>&1
     if [ $? == 0 ]; then
        echo "-W- The zfs pool '$pool' is currently being scrubbed. Skipping all snapshot operations."
        exit 0
diff --git a/zfs-replicate b/zfs-replicate
index 8b53d1f..174d6dd 100755
--- a/zfs-replicate
+++ b/zfs-replicate
@@ -27,26 +27,24 @@ cleanup() {
   if [[ -e "$remote_list" ]]; then
     rm -f $remote_list
   fi
-  if [[ -n "$remote" ]]; then
-    ssh $remote ls -d "$lockdir" > /dev/null 2>&1
-    if [[ $? == 0 ]]; then
-      ssh $remote rm -rf "$lockdir"
-    fi
+  $ssh $remote ls -d "$lockdir" > /dev/null 2>&1
+  if [[ $? == 0 ]]; then
+    $ssh $remote rm -rf "$lockdir"
   fi
 }
 fatal_and_exit() {
   echo -e 2>&1 "$1"
   # Destroy the backup markers on the local filesystem if they exist
   if [[ -n "$current_backup_marker" ]]; then
-    zfs list -t snapshot ${local_pool}/${current_backup_marker} > /dev/null 2>&1
+    zfs list -t snapshot ${backup_pool}/${current_backup_marker} > /dev/null 2>&1
     if [ $? == 0 ]; then
-      $zfs destroy ${local_pool}/${current_backup_marker}
+      $zfs destroy ${backup_pool}/${current_backup_marker}
     fi
   fi
   if [[ -n "$previous_backup_marker" ]]; then
-    zfs list -t snapshot ${local_pool}/${previous_backup_marker} > /dev/null 2>&1 
+    zfs list -t snapshot ${backup_pool}/${previous_backup_marker} > /dev/null 2>&1 
     if [ $? == 0 ]; then
-      $zfs destroy ${local_pool}/${previous_backup_marker}
+      $zfs destroy ${backup_pool}/${previous_backup_marker}
     fi
   fi
   # send email notification
@@ -64,26 +62,32 @@ if [[ -z "$remote" ]] || [[ -z "$remote_fs" ]]; then
   fatal_and_exit "Usage: $0 <hostname> <zfs filesystem>"
 fi
 
-# Make sure the local pool and local receiving filesystem exist, or print some errors
-zpool list -H "$local_pool" >/dev/null 2>&1
+# check for localhost
+if [[ $remote = "localhost" ]]; then
+  remote=""
+  ssh=""
+fi
+
+# Make sure the local backup pool and local receiving filesystem exist, or print some errors
+zpool list -H "$backup_pool" >/dev/null 2>&1
 if [ $? != 0 ]; then
-  fatal_and_exit "-E- The local pool, '$local_pool' doesn't seem to exist." $mailto
+  fatal_and_exit "-E- The local backup pool, '$backup_pool' doesn't seem to exist." $mailto
 fi
-zfs list "$local_pool/$remote_pool" >/dev/null 2>&1
+zfs list "$backup_pool/$remote_pool" >/dev/null 2>&1
 if [ $? != 0 ]; then
-  echo >&2 "-I- The local filesystem for the remote pool, '$local_pool/$remote_pool' doesn't seem to exist."
-  echo >&2 "    Creating the local filesystem to receive the remote pool into: $local_pool/$remote_pool"
-  $zfs create $local_pool/$remote_pool
+  echo >&2 "-I- The local filesystem for the remote pool, '$backup_pool/$remote_pool' doesn't seem to exist."
+  echo >&2 "    Creating the local filesystem to receive the remote pool into: $backup_pool/$remote_pool"
+  $zfs create $backup_pool/$remote_pool
   if [ $? != 0 ]; then
     fatal_and_exit "-E- remote $zfs create command failed" $mailto
   fi
 fi
 
-# Obtain the zpool guid for the local pool
-local_pool_guid=`zpool get guid $local_pool 2>&1 | grep $local_pool | awk '{ print $3 }'`
-zpool get guid $local_pool > /dev/null 2>&1
+# Obtain the zpool guid for the local backup pool
+backup_pool_guid=`zpool get guid $backup_pool 2>&1 | grep $backup_pool | awk '{ print $3 }'`
+zpool get guid $backup_pool > /dev/null 2>&1
 if [ $? != 0 ]; then
-  fatal_and_exit "-E- Unable to extract the guid for the local pool: $local_pool" $mailto
+  fatal_and_exit "-E- Unable to extract the guid for the local backup pool: $backup_pool" $mailto
 fi
 
 # Turn on shell verbosity
@@ -95,7 +99,7 @@ maxsleeptime=60
 maxattempts=500
 attempts=0
 while true; do
-  ssh $remote mkdir "$lockdir" >/dev/null 2>&1
+  $ssh $remote mkdir "$lockdir" >/dev/null 2>&1
   if [ $? != 0 ]; then
     # Another zfs admin tool is running.
     # Wait a random amount of time and try again
@@ -109,18 +113,18 @@ while true; do
   if [[ $attempts -gt $maxattempts ]]; then
     # We've exceeded our maximum while loop count
     echo "-E- The zfs filesystem has been locked down. Skipping replicate operation."
-    fail_msg=`ssh $remote ls -ld $lockdir 2>&1`
+    fail_msg=`$ssh $remote ls -ld $lockdir 2>&1`
     fatal_and_exit "zfs-replicate-all unable to obtain zfs admin lock:\n$fail_msg" $mailto
   fi
 done
 
 # Setup our backup marker names
-current_backup_marker=${remote_fs}@current-backup-${local_pool_guid}
-previous_backup_marker=${remote_fs}@previous-backup-${local_pool_guid}
+current_backup_marker=${remote_fs}@current-backup-${backup_pool_guid}
+previous_backup_marker=${remote_fs}@previous-backup-${backup_pool_guid}
 
 # List the snapshots on the remote machine.
 remote_list=$(mktemp /tmp/replicate.XXXXXX)
-ssh $remote \
+$ssh $remote \
     $zfs list -H -t snapshot |
     grep ^${remote_fs}@ |
     awk '{print$1}' > $remote_list
@@ -133,9 +137,9 @@ fi
 # If you do, it can mess up the common finding algorithm below.
 local_list=$(mktemp /tmp/replicate.XXXXXX)
 $zfs list -H -t snapshot |
-    grep ^${local_pool}/${remote_fs}@ |
-    grep -v ^${local_pool}/${current_backup_marker} | 
-    awk "{gsub(/^$local_pool./,\"\",\$1); print\$1}" > $local_list
+    grep ^${backup_pool}/${remote_fs}@ |
+    grep -v ^${backup_pool}/${current_backup_marker} | 
+    awk "{gsub(/^$backup_pool./,\"\",\$1); print\$1}" > $local_list
 if [ $? != 0 ]; then
   fatal_and_exit "-E- local $zfs list command failed" $mailto
 fi
@@ -143,14 +147,14 @@ fi
 # Destroy the current backup marker snapshot on the remote system if it exists
 grep -q ${current_backup_marker} $remote_list
 if [ $? == 0 ]; then
-  ssh $remote $zfs destroy ${current_backup_marker} 
+  $ssh $remote $zfs destroy ${current_backup_marker} 
   if [ $? != 0 ]; then
     fatal_and_exit "-E- remote $zfs destroy command failed" $mailto
   fi
 fi
 
 # Create the current backup marker snapshot on the remote system
-ssh $remote $zfs snapshot ${current_backup_marker}
+$ssh $remote $zfs snapshot ${current_backup_marker}
 if [ $? != 0 ]; then
   fatal_and_exit "-E- remote $zfs snapshot command failed" $mailto
 fi
@@ -168,21 +172,21 @@ no_markers=$(($no_markers || $?))
 if [ $no_markers == 0 ]; then
   # We found backup markers, incrementally send the new snaps
 
-  # First, rollback the local pool to the previous backup marker in case the previous
+  # First, rollback the local backup pool to the previous backup marker in case the previous
   # backup was interrupted for some reason. If we don't do this, the zfs send -R command
   # below may complain about snaps already existing as it tries to resend from the 
   # previous backup marker again from a previously interrupted replicate.
-  $zfs rollback -r ${local_pool}/${previous_backup_marker} 
+  $zfs rollback -r ${backup_pool}/${previous_backup_marker} 
   if [ $? != 0 ]; then
     fatal_and_exit "-E- remote incremental $zfs rollback command failed" $mailto
   fi
   # Now it should be safe to send the snaps
   if [[ $throttle_enable == 1 && -e $throttle ]]; then
-    ssh $remote $zfs send -R -I${previous_backup_marker} ${current_backup_marker} | 
-        $throttle $throttle_opt | $zfs receive -vF -d ${local_pool}/${remote_pool}
+    $ssh $remote $zfs send -R -I${previous_backup_marker} ${current_backup_marker} | 
+        $throttle $throttle_opt | $zfs receive -vF -d ${backup_pool}/${remote_pool}
   else 
-    ssh $remote $zfs send -R -I${previous_backup_marker} ${current_backup_marker} |
-        $zfs receive -vF -d ${local_pool}/${remote_pool}
+    $ssh $remote $zfs send -R -I${previous_backup_marker} ${current_backup_marker} |
+        $zfs receive -vF -d ${backup_pool}/${remote_pool}
   fi
   if [ $? != 0 ]; then
     fatal_and_exit "-E- remote incremental $zfs send command failed" $mailto
@@ -203,11 +207,11 @@ else
   if [[ -n "$common" ]]; then
     # We found a common snapshot, incrementally send the new snaps
     if [[ $throttle_enable == 1 && -e $throttle ]]; then
-      ssh $remote $zfs send -R -I${common/*@/@} ${current_backup_marker} |
-          $throttle $throttle_opt | $zfs receive -vF -d ${local_pool}/${remote_pool}
+      $ssh $remote $zfs send -R -I${common/*@/@} ${current_backup_marker} |
+          $throttle $throttle_opt | $zfs receive -vF -d ${backup_pool}/${remote_pool}
     else
-      ssh $remote $zfs send -R -I${common/*@/@} ${current_backup_marker} |
-          $zfs receive -vF -d ${local_pool}/${remote_pool}
+      $ssh $remote $zfs send -R -I${common/*@/@} ${current_backup_marker} |
+          $zfs receive -vF -d ${backup_pool}/${remote_pool}
     fi
     if [ $? != 0 ]; then
       fatal_and_exit "-E- remote incremental $zfs send command failed" $mailto
@@ -216,26 +220,26 @@ else
     # We did not find any markers or a common snapshot
     # At this point, we'll have to send the entire filesystem
     # Destroy the local filesystem if it exists before receving the full replicate
-    zfs list ${local_pool}/${remote_fs} > /dev/null 2>&1
+    zfs list ${backup_pool}/${remote_fs} > /dev/null 2>&1
     if [ $? == 0 ]; then
       if [[ $destroy_local_filesystem_on_full_replicate == 1 ]]; then
-        $zfs destroy -r ${local_pool}/${remote_fs}
+        $zfs destroy -r ${backup_pool}/${remote_fs}
         if [ $? != 0 ]; then
           fatal_and_exit "-E- remote full $zfs destroy command failed" $mailto
         fi
       else
         echo "-W- We need to destroy a local filesystem before receiving a full stream."
 	echo "    However, since the option is set to prevent this, skipping replicate operation."
-        fatal_and_exit "unable to destroy local filesystem:\n$zfs destroy -r ${local_pool}/${remote_fs} not able to run" $mailto
+        fatal_and_exit "unable to destroy local filesystem:\n$zfs destroy -r ${backup_pool}/${remote_fs} not able to run" $mailto
       fi
     fi
     # Send the full filesystem
     if [[ $throttle_enable == 1 && -e $throttle ]]; then
-      ssh $remote $zfs send -R ${current_backup_marker} |
-          $throttle $throttle_opt | $zfs receive -vF -d ${local_pool}/${remote_pool}
+      $ssh $remote $zfs send -R ${current_backup_marker} |
+          $throttle $throttle_opt | $zfs receive -vF -d ${backup_pool}/${remote_pool}
     else
-      ssh $remote $zfs send -R ${current_backup_marker} |
-          $zfs receive -vF -d ${local_pool}/${remote_pool}
+      $ssh $remote $zfs send -R ${current_backup_marker} |
+          $zfs receive -vF -d ${backup_pool}/${remote_pool}
     fi
     if [ $? != 0 ]; then
       fatal_and_exit "-E- remote full $zfs send command failed" $mailto
@@ -245,16 +249,15 @@ fi
  
 # destroy the previous backup markers now that we've replicated past them
 # don't check the return codes here because these may not exist, and that is ok
-$zfs destroy ${local_pool}/${previous_backup_marker} > /dev/null 2>&1
-ssh $remote $zfs destroy ${previous_backup_marker} > /dev/null 2>&1
+$zfs destroy ${backup_pool}/${previous_backup_marker} > /dev/null 2>&1
+$ssh $remote $zfs destroy ${previous_backup_marker} > /dev/null 2>&1
 
 # Rename the current backup marker to be the previous backup marker
-$zfs rename ${local_pool}/${current_backup_marker} ${local_pool}/${previous_backup_marker}
+$zfs rename ${backup_pool}/${current_backup_marker} ${backup_pool}/${previous_backup_marker}
 if [ $? != 0 ]; then
   fatal_and_exit "-E- local $zfs rename command failed" $mailto
 fi
-ssh $remote $zfs rename ${current_backup_marker} ${previous_backup_marker}
+$ssh $remote $zfs rename ${current_backup_marker} ${previous_backup_marker}
 if [ $? != 0 ]; then
   fatal_and_exit "-E- remote $zfs rename command failed" $mailto
 fi
-
diff --git a/zfs-replicate-all b/zfs-replicate-all
index 6f105d6..c47b86f 100755
--- a/zfs-replicate-all
+++ b/zfs-replicate-all
@@ -61,7 +61,7 @@ replicate() {
 
 # This function obtains the date a given snapshot was created in epoch seconds
 snapshot_age() {
-  snapshot=${local_pool}/${1}${previous_backup_marker}
+  snapshot=${backup_pool}/${1}${previous_backup_marker}
   $zfs list -t snapshot ${snapshot} > /dev/null 2>&1
   if [ $? == 0 ]; then
     $zfs get creation ${snapshot} > /dev/null 2>&1
@@ -77,17 +77,32 @@ snapshot_age() {
   fi
 }
 
-# Obtain the zpool guid for the local pool
-local_pool_guid=`zpool get guid $local_pool 2>&1 | grep $local_pool | awk '{ print $3 }'`
-zpool get guid $local_pool > /dev/null 2>&1
+# Mount the local backup pool if needed and the option is given to do so, else error out
+zpool list -H "$backup_pool" >/dev/null 2>&1
 if [ $? != 0 ]; then
-  echo >&2 "-E- Unable to extract the guid for the local pool: $local_pool"
+  if [[ $import_export_backup_pool == 1 ]]; then
+    zpool import $backup_pool
+    if [ $? != 0 ]; then
+      echo "-E- unable to import the backup pool $backup_pool"
+      exit 1
+    fi
+  else 
+    echo "-E- The local backup pool, '$backup_pool' doesn't seem to exist." $mailto
+    exit 1
+  fi
+fi
+
+# Obtain the zpool guid for the local backup pool
+backup_pool_guid=`zpool get guid $backup_pool 2>&1 | grep $backup_pool | awk '{ print $3 }'`
+zpool get guid $backup_pool > /dev/null 2>&1
+if [ $? != 0 ]; then
+  echo >&2 "-E- Unable to extract the guid for the local backup pool: $backup_pool"
   exit 1
 fi
 
 # Setup our backup marker names
-current_backup_marker=@current-backup-${local_pool_guid}
-previous_backup_marker=@previous-backup-${local_pool_guid}
+current_backup_marker=@current-backup-${backup_pool_guid}
+previous_backup_marker=@previous-backup-${backup_pool_guid}
 
 # Auto snapshot every zfs filesystem on the system specified below
 echo "$date ZFS replicate started" >> $logfile
@@ -104,10 +119,18 @@ rm -f $tmpfile
 
 # Replicate the sorted filesystems
 for filesystem in $sorted_filesystems; do
-  echo "-> Replicating $remote:$filesystem to ${local_pool}/${filesystem}" | tee -a $mylogfile
+  echo "-> Replicating $remote:$filesystem to ${backup_pool}/${filesystem}" | tee -a $mylogfile
   replicate $remote $filesystem
 done
 
+# Export the local pool if told to do so
+if [[ $import_export_backup_pool == 1 ]]; then
+  zpool export $backup_pool
+  if [ $? != 0 ]; then
+    fatal_and_exit "-E- unable to export the local backup pool $backup_pool"
+  fi
+fi
+
 # All done
 echo `date` ZFS replicate complete >> $logfile
 echo `date` ZFS replicate complete | tee -a $mylogfile
diff --git a/zfs-restore b/zfs-restore
index b3c809a..84de61e 100755
--- a/zfs-restore
+++ b/zfs-restore
@@ -34,6 +34,12 @@ fi
 date=`date`
 echo "$date ZFS restore started: $src_pool/$src_fs -> $dst_hostname:$dst_pool/$dst_fs"
 
+# check for localhost
+if [[ $dst_hostname = "localhost" ]]; then
+  dst_hostname=""
+  ssh=""
+fi
+
 # Make sure the src pool and src filesystem exist, or print some errors
 zpool list -H "$src_pool" >/dev/null 2>&1
 if [ $? != 0 ]; then
@@ -61,33 +67,33 @@ if [ $? != 0 ]; then
 fi
 
 # Check to make sure the dst pool exists
-ssh $dst_hostname "$zfs list ${dst_pool}" > /dev/null 2>&1
+$ssh $dst_hostname $zfs list ${dst_pool} > /dev/null 2>&1
 if [ $? != 0 ]; then
   fatal_and_exit "-E- The destination pool '$dst_pool' does not exist. Create the pool '$dst_pool' and try again."
 fi
 
 # Check to make sure the dst filesystem does not exist
-ssh $dst_hostname "$zfs list ${dst_pool}/${dst_fs}" > /dev/null 2>&1
+$ssh $dst_hostname $zfs list ${dst_pool}/${dst_fs} > /dev/null 2>&1
 if [ $? == 0 ]; then
   fatal_and_exit "-E- The destination pool/filesystem '$dst_pool/$dst_fs' already exists. Destroy the filesystem '$dst_fs' and try again."
 fi 
 
 # Now send the src filesystem
 if [[ -n "$SCRIPT_UNDER_TEST" ]]; then
-  echo "$zfs send -R $src_pool/$last_backup_marker | ssh $dst_hostname $zfs recv -dv $dst_pool"
+  echo "$zfs send -R $src_pool/$last_backup_marker | $ssh $dst_hostname $zfs recv -dv $dst_pool"
 else 
    if [[ $throttle_enable == 1 && -e $throttle ]]; then
-     $zfs send -R "$src_pool/$last_backup_marker" | $throttle $throttle_opt | ssh $dst_hostname "$zfs recv -dv $dst_pool"
+     $zfs send -R "$src_pool/$last_backup_marker" | $throttle $throttle_opt | $ssh $dst_hostname $zfs recv -dv $dst_pool
    else 
-     $zfs send -R "$src_pool/$last_backup_marker" | ssh $dst_hostname "$zfs recv -dv $dst_pool"
+     $zfs send -R "$src_pool/$last_backup_marker" | $ssh $dst_hostname $zfs recv -dv $dst_pool
    fi 
 fi
 
 # Now rename the dst filesystem (move it into place)
 if [[ -n "$SCRIPT_UNDER_TEST" ]]; then
-  echo "$dst_hostname $zfs rename $dst_pool/$src_fs $dst_pool/$dst_fs"
+  echo "$ssh $dst_hostname $zfs rename $dst_pool/$src_fs $dst_pool/$dst_fs"
 else
-  ssh $dst_hostname "$zfs rename $dst_pool/$src_fs $dst_pool/$dst_fs"
+  $ssh $dst_hostname $zfs rename $dst_pool/$src_fs $dst_pool/$dst_fs
 fi
 
 # All done!
diff --git a/zfs-restore-all b/zfs-restore-all
index 7d174b4..3931190 100755
--- a/zfs-restore-all
+++ b/zfs-restore-all
@@ -22,7 +22,6 @@ cleanup_and_exit() {
 }
 trap cleanup_and_exit INT
 
-
 # See if the user has a specific pool to restore in mind
 restore_pool=$1
 
@@ -34,13 +33,17 @@ for filesystem in $filesystems_to_replicate; do
   dst_pool=${filesystem%%/*}
   dst_fs=${filesystem#*/}
   # Check to make sure the dst filesystem does not exist
-  ssh $remote "$zfs list ${dst_pool}/${dst_fs}" > /dev/null 2>&1
+  if [[ $remote = "localhost" ]]; then
+      $ssh $remote $zfs list ${dst_pool}/${dst_fs} > /dev/null 2>&1
+  else 
+      $zfs list ${dst_pool}/${dst_fs} > /dev/null 2>&1
+  fi
   if [ $? != 0 ]; then
     echo "$filesystem" | grep -q "$restore_pool" 
     if [ $? == 0 ]; then
       # This filesystem matches our restore pool pattern 
       echo `date` Restoring $filesystem to $remote
-      zfs-restore $local_pool $filesystem $dst_pool $dst_fs $remote
+      zfs-restore $backup_pool $filesystem $dst_pool $dst_fs $remote
     fi
   else
     echo "-I- Filesystem already exists on destination. Skipping: $filesystem"
diff --git a/zfs-rm-all-snaps b/zfs-rm-all-snaps
new file mode 100755
index 0000000..c65c5ba
--- /dev/null
+++ b/zfs-rm-all-snaps
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Author: Alan Pippin
+# Description: This script will remove all snaps containing a given snapshot pattern
+#              across all filesystems on a given pool.
+# Usage: zfs-rm-all-snaps <pool> <snapshot pattern>
+
+# source our configuration
+config="${0%/*}/zfs-scripts.conf"
+[ -e "${config}.dist" ] && . ${config}.dist
+[ -e "${config}" ] && . ${config}
+
+# command line arg parsing
+zfs_pool=$1
+snap_pattern=$2
+
+if [[ -z "$zfs_pool" ]] || [[ -z "$snap_pattern" ]]; then
+  echo "Usage: $0 <pool> <snapshot pattern>"
+  exit 1
+fi
+
+echo "-> Deleting all snapshots on pool '$zfs_pool' with pattern '$snap_pattern'"
+for snap in `zfs list -t snapshot 2>/dev/null | grep "^$zfs_pool" | grep "$snap_pattern" | awk '{print $1}'`; do
+  echo "   removing snapshot: $snap"
+done
+
+echo -e "\n<Press Enter to execute removal, CTL-C to abort>";
+read
+
+for snap in `zfs list -t snapshot 2>/dev/null | grep "^$zfs_pool" | grep "$snap_pattern" | awk '{print $1}'`; do
+  zfs destroy "$snap" 2>/dev/null
+done
+
+echo "-> Snapshots removed"
\ No newline at end of file
diff --git a/zfs-scripts.conf.dist b/zfs-scripts.conf.dist
index 956e697..7b021f6 100644
--- a/zfs-scripts.conf.dist
+++ b/zfs-scripts.conf.dist
@@ -1,15 +1,12 @@
 ###########################################################################
-# This is a shell config script included by the other ZFS scripts.
-# You must copy this file and modify these values to match your system.
-# Save the resulting file as "zfs-scripts.conf" in this directory.
-# This will prevent your settings from being overwritten by future updates.
+# local configuration file for ZFS scripts
 ###########################################################################
 
 # setup your path here to find all the binaries the ZFS scripts call
 PATH=/usr/sbin:/sbin:/etc/bin:.:$PATH
 
 # specify the path to the zfs binary
-zfs=/usr/sbin/zfs
+zfs=/sbin/zfs
 
 # specify the path to your command line mailer
 mailx=/usr/bin/mailx
@@ -21,31 +18,40 @@ logdir="/var/log/zfs"
 lockdir="/tmp/zfs-admin-lock"
 
 # specify the user to send email reports to
-mailto=
+mailto="user@domain"
 
-# specify the name of the remote server to pull snapshots from to backup locally
+# specifu the ssh command and any options needed for accessing a remote server
+ssh="ssh"
+
+# specify the fqdn of the remote server to pull snapshots from to backup locally
+# specify "localhost" if the remote server is the local machine
 remote=
 
-# specify the name of the local pool to store remotely pulled (backup) snapshots to
-local_pool=
+# specify the name of the local pool to store the $remote's snapshots into
+backup_pool=
+
+# import backup pool before replication and export backup pool after replication
+import_export_backup_pool=0
 
 # when this variable is set, local filesystems will be destroyed
 # before receiving a full streams into them from the remote source.
+# if it needs to do this, and this option is set to 0, it aborts.
 destroy_local_filesystem_on_full_replicate=0
 
 # set this to 1 if you want the snapshot script to run in "test" mode (not really take any snaps)
+# leave blank if not under test
 SNAP_UNDER_TEST=
 
 # Specify the maximum run time in minutes that the replicate script can run for (0=no limit)
 maxruntime=0
 
 # Setup throttling related parameters that will rate limit the zfs send | zfs receive pipe
+# The maximum limit a local backup can handle to avoid excessive CPU load is 10MB/s
 throttle_enable=0
-throttle_opt="-v -M 1"
-throttle=/usr/local/bin/throttle
+throttle_opt="-v -M 10"
 
-# Specify the list of filesystems to replicate from the remote to the local_pool (1 per line)
-# (enter 1 filesystem per line)
-filesystems_to_replicate='
-'
+# Specify the list of filesystems to replicate from the $remote to the $backup_pool (1 per line)
+# The format of each line should be: pool/filesystem
+filesystems_to_replicate="
+"
 
diff --git a/zfs-scrub b/zfs-scrub
index 939c798..462d979 100755
--- a/zfs-scrub
+++ b/zfs-scrub
@@ -26,7 +26,7 @@ do
   # Check to see if any zfs filesystem has a scrub being performed on it now.
   # If it does, we cannot perform more than one scrub operation at a time.
   while true; do
-    zpool status | grep scrub: | grep "in progress" > /dev/null 2>&1
+    zpool status | grep scan: | grep "in progress" > /dev/null 2>&1
     if [ $? == 0 ]; then
         # Another zpool scrub operation is already running
         # Wait until it is done before continuing
@@ -44,7 +44,7 @@ do
 
   # Wait until the scrub completes, and check for any errors
   while true; do
-    zpool status $i | grep scrub: | grep "in progress" > /dev/null 2>&1
+    zpool status $i | grep scan: | grep "in progress" > /dev/null 2>&1
     if [ $? == 0 ]; then
         # Our zpool scrub operation is still running
         # Wait until it is done before continuing
@@ -60,7 +60,7 @@ do
   echo "$date: Scrub completed for zfs pool $i"
 
   # Check for any scrub errors
-  zpool status $i | grep scrub: | grep "with 0 errors" > /dev/null 2>&1
+  zpool status $i | grep scan: | grep "with 0 errors" > /dev/null 2>&1
   if [ $? != 0 ]; then
     # The scrub found errors
     zpool status $i | $mailx -s "zpool scrub $i found errors" $mailto