tests/zfs-tests/tests/functional/cli_root/zpool_import/import_rewind_config_changed.ksh

   1 #!/bin/ksh -p
   2
   3 #
   4 # This file and its contents are supplied under the terms of the
   5 # Common Development and Distribution License ("CDDL"), version 1.0.
   6 # You may only use this file in accordance with the terms of version
   7 # 1.0 of the CDDL.
   8 #
   9 # A full copy of the text of the CDDL should have accompanied this
  10 # source.  A copy of the CDDL is also available via the Internet at
  11 # http://www.illumos.org/license/CDDL.
  12 #
  13
  14 #
  15 # Copyright (c) 2017 by Delphix. All rights reserved.
  16 #
  17
  18 . $STF_SUITE/tests/functional/cli_root/zpool_import/zpool_import.kshlib
  19
  20 #
  21 # DESCRIPTION:
  22 #       It should be possible to rewind a pool beyond a configuration change.
  23 #
  24 # STRATEGY:
  25 #       1. Create a pool.
  26 #       2. Generate files and remember their md5sum.
  27 #       3. Note last synced txg.
  28 #       4. Take a snapshot to make sure old blocks are not overwritten.
  29 #       5. Perform zpool add/attach/detach/remove operation.
  30 #       6. Change device paths if requested and re-import pool.
  31 #       7. Checkpoint the pool as one last attempt to preserve old blocks.
  32 #       8. Overwrite the files.
  33 #       9. Export the pool.
  34 #       10. Verify that we can rewind the pool to the noted txg.
  35 #       11. Verify that the files are readable and retain their old data.
  36 #
  37 # DISCLAIMER:
  38 #       This test can fail since nothing guarantees that old MOS blocks aren't
  39 #       overwritten. Snapshots protect datasets and data files but not the MOS.
  40 #       sync_some_data_a_few_times interleaves file data and MOS data for a few
  41 #       txgs, thus increasing the odds that some txgs will have their MOS data
  42 #       left untouched.
  43 #
  44
  45 verify_runnable "global"
  46
  47 function custom_cleanup
  48 {
  49         set_vdev_validate_skip 0
  50         cleanup
  51         log_must set_tunable64 zfs_vdev_min_ms_count 16
  52 }
  53
  54 log_onexit custom_cleanup
  55
  56 function test_common
  57 {
  58         typeset poolcreate="$1"
  59         typeset addvdevs="$2"
  60         typeset attachargs="${3:-}"
  61         typeset detachvdev="${4:-}"
  62         typeset removevdev="${5:-}"
  63         typeset finalpool="${6:-}"
  64
  65         typeset poolcheck="$poolcreate"
  66
  67         log_must zpool create $TESTPOOL1 $poolcreate
  68
  69         log_must generate_data $TESTPOOL1 $MD5FILE
  70
  71         # syncing a few times while writing new data increases the odds that MOS
  72         # metadata for some of the txgs will survive
  73         log_must sync_some_data_a_few_times $TESTPOOL1
  74         typeset txg
  75         txg=$(get_last_txg_synced $TESTPOOL1)
  76         log_must zfs snapshot -r $TESTPOOL1@snap1
  77
  78         #
  79         # Perform config change operations
  80         #
  81         if [[ -n $addvdevs ]]; then
  82                 log_must zpool add -f $TESTPOOL1 $addvdevs
  83         fi
  84         if [[ -n $attachargs ]]; then
  85                 log_must zpool attach $TESTPOOL1 $attachargs
  86         fi
  87         if [[ -n $detachvdev ]]; then
  88                 log_must zpool detach $TESTPOOL1 $detachvdev
  89         fi
  90         if [[ -n $removevdev ]]; then
  91                 [[ -z $finalpool ]] &&
  92                     log_fail "Must provide final pool status!"
  93                 log_must zpool remove $TESTPOOL1 $removevdev
  94                 log_must wait_for_pool_config $TESTPOOL1 "$finalpool"
  95         fi
  96         if [[ -n $pathstochange ]]; then
  97                 #
  98                 # Change device paths and re-import pool to update labels
  99                 #
 100                 zpool export $TESTPOOL1
 101                 for dev in $pathstochange; do
 102                         log_must mv $dev "${dev}_new"
 103                         poolcheck=$(echo "$poolcheck" | \
 104                             sed "s:$dev:${dev}_new:g")
 105                 done
 106                 zpool import -d $DEVICE_DIR $TESTPOOL1
 107         fi
 108
 109         #
 110         # In an attempt to leave MOS data untouched so extreme
 111         # rewind is successful during import we checkpoint the
 112         # pool and hope that these MOS data are part of the
 113         # checkpoint (e.g they stay around). If this goes as
 114         # expected, then extreme rewind should rewind back even
 115         # further than the time that we took the checkpoint.
 116         #
 117         # Note that, ideally we would want to take a checkpoint
 118         # right after we recond the txg we plan to rewind to.
 119         # But since we can't attach, detach or remove devices
 120         # while having a checkpoint, we take it after the
 121         # operation that changes the config.
 122         #
 123         log_must zpool checkpoint $TESTPOOL1
 124
 125         log_must overwrite_data $TESTPOOL1 ""
 126
 127         log_must zpool export $TESTPOOL1
 128
 129         log_must zpool import -d $DEVICE_DIR -T $txg $TESTPOOL1
 130         log_must check_pool_config $TESTPOOL1 "$poolcheck"
 131
 132         log_must verify_data_md5sums $MD5FILE
 133
 134         # Cleanup
 135         log_must zpool destroy $TESTPOOL1
 136         if [[ -n $pathstochange ]]; then
 137                 for dev in $pathstochange; do
 138                         log_must mv "${dev}_new" $dev
 139                 done
 140         fi
 141         # Fast way to clear vdev labels
 142         log_must zpool create -f $TESTPOOL2 $VDEV0 $VDEV1 $VDEV2 $VDEV3 $VDEV4
 143         log_must zpool destroy $TESTPOOL2
 144
 145         log_note ""
 146 }
 147
 148 function test_add_vdevs
 149 {
 150         typeset poolcreate="$1"
 151         typeset addvdevs="$2"
 152
 153         log_note "$0: pool '$poolcreate', add $addvdevs."
 154
 155         test_common "$poolcreate" "$addvdevs"
 156 }
 157
 158 function test_attach_vdev
 159 {
 160         typeset poolcreate="$1"
 161         typeset attachto="$2"
 162         typeset attachvdev="$3"
 163
 164         log_note "$0: pool '$poolcreate', attach $attachvdev to $attachto."
 165
 166         test_common "$poolcreate" "" "$attachto $attachvdev"
 167 }
 168
 169 function test_detach_vdev
 170 {
 171         typeset poolcreate="$1"
 172         typeset detachvdev="$2"
 173
 174         log_note "$0: pool '$poolcreate', detach $detachvdev."
 175
 176         test_common "$poolcreate" "" "" "$detachvdev"
 177 }
 178
 179 function test_attach_detach_vdev
 180 {
 181         typeset poolcreate="$1"
 182         typeset attachto="$2"
 183         typeset attachvdev="$3"
 184         typeset detachvdev="$4"
 185
 186         log_note "$0: pool '$poolcreate', attach $attachvdev to $attachto," \
 187             "then detach $detachvdev."
 188
 189         test_common "$poolcreate" "" "$attachto $attachvdev" "$detachvdev"
 190 }
 191
 192 function test_remove_vdev
 193 {
 194         typeset poolcreate="$1"
 195         typeset removevdev="$2"
 196         typeset finalpool="$3"
 197
 198         log_note "$0: pool '$poolcreate', remove $removevdev."
 199
 200         test_common "$poolcreate" "" "" "" "$removevdev" "$finalpool"
 201 }
 202
 203 # Record txg history
 204 is_linux && log_must set_tunable32 zfs_txg_history 100
 205
 206 # Make the devices bigger to reduce chances of overwriting MOS metadata.
 207 increase_device_sizes $(( FILE_SIZE * 4 ))
 208
 209 # Increase the number of metaslabs for small pools temporarily to
 210 # reduce the chance of reusing a metaslab that holds old MOS metadata.
 211 log_must set_tunable64 zfs_vdev_min_ms_count 150
 212
 213 # Part of the rewind test is to see how it reacts to path changes
 214 typeset pathstochange="$VDEV0 $VDEV1 $VDEV2 $VDEV3"
 215
 216 log_note " == test rewind after device addition == "
 217
 218 test_add_vdevs "$VDEV0" "$VDEV1"
 219 test_add_vdevs "$VDEV0 $VDEV1" "$VDEV2"
 220 test_add_vdevs "$VDEV0" "$VDEV1 $VDEV2"
 221 test_add_vdevs "mirror $VDEV0 $VDEV1" "mirror $VDEV2 $VDEV3"
 222 test_add_vdevs "$VDEV0" "raidz $VDEV1 $VDEV2 $VDEV3"
 223 test_add_vdevs "$VDEV0" "log $VDEV1"
 224 test_add_vdevs "$VDEV0 log $VDEV1" "$VDEV2"
 225
 226 log_note " == test rewind after device attach == "
 227
 228 test_attach_vdev "$VDEV0" "$VDEV0" "$VDEV1"
 229 test_attach_vdev "mirror $VDEV0 $VDEV1" "$VDEV0" "$VDEV2"
 230 test_attach_vdev "$VDEV0 $VDEV1" "$VDEV0" "$VDEV2"
 231
 232 log_note " == test rewind after device removal == "
 233
 234 # Once we remove a device it will be overlooked in the device scan, so we must
 235 # preserve its original path
 236 pathstochange="$VDEV0 $VDEV2"
 237 test_remove_vdev "$VDEV0 $VDEV1 $VDEV2" "$VDEV1" "$VDEV0 $VDEV2"
 238
 239 #
 240 # Path change and detach are incompatible. Detach changes the guid of the vdev
 241 # so we have no direct way to link the new path to an existing vdev.
 242 #
 243 pathstochange=""
 244
 245 log_note " == test rewind after device detach == "
 246
 247 test_detach_vdev "mirror $VDEV0 $VDEV1" "$VDEV1"
 248 test_detach_vdev "mirror $VDEV0 $VDEV1 mirror $VDEV2 $VDEV3" "$VDEV1"
 249 test_detach_vdev "$VDEV0 log mirror $VDEV1 $VDEV2" "$VDEV2"
 250
 251 log_note " == test rewind after device attach followed by device detach == "
 252
 253 #
 254 # We need to disable vdev validation since once we detach VDEV1, VDEV0 will
 255 # inherit the mirror tvd's guid and lose its original guid.
 256 #
 257 set_vdev_validate_skip 1
 258 test_attach_detach_vdev "$VDEV0" "$VDEV0" "$VDEV1" "$VDEV1"
 259 set_vdev_validate_skip 0
 260
 261 log_pass "zpool import rewind after configuration change passed."