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cac4a9743a
If a single, standard LV is specified as the cache, use it directly instead of converting it into a cache-pool object with two separate LVs (for data and metadata). With a single LV as the cache, lvm will use blocks at the beginning for metadata, and the rest for data. Separate dm linear devices are set up to point at the metadata and data areas of the LV. These dm devs are given to the dm-cache target to use. The single LV cache cannot be resized without recreating it. If the --poolmetadata option is used to specify an LV for metadata, then a cache pool will be created (with separate LVs for data and metadata.) Usage: $ lvcreate -n main -L 128M vg /dev/loop0 $ lvcreate -n fast -L 64M vg /dev/loop1 $ lvs -a vg LV VG Attr LSize Type Devices main vg -wi-a----- 128.00m linear /dev/loop0(0) fast vg -wi-a----- 64.00m linear /dev/loop1(0) $ lvconvert --type cache --cachepool fast vg/main $ lvs -a vg LV VG Attr LSize Origin Pool Type Devices [fast] vg Cwi---C--- 64.00m linear /dev/loop1(0) main vg Cwi---C--- 128.00m [main_corig] [fast] cache main_corig(0) [main_corig] vg owi---C--- 128.00m linear /dev/loop0(0) $ lvchange -ay vg/main $ dmsetup ls vg-fast_cdata (253:4) vg-fast_cmeta (253:5) vg-main_corig (253:6) vg-main (253:24) vg-fast (253:3) $ dmsetup table vg-fast_cdata: 0 98304 linear 253:3 32768 vg-fast_cmeta: 0 32768 linear 253:3 0 vg-main_corig: 0 262144 linear 7:0 2048 vg-main: 0 262144 cache 253:5 253:4 253:6 128 2 metadata2 writethrough mq 0 vg-fast: 0 131072 linear 7:1 2048 $ lvchange -an vg/min $ lvconvert --splitcache vg/main $ lvs -a vg LV VG Attr LSize Type Devices fast vg -wi------- 64.00m linear /dev/loop1(0) main vg -wi------- 128.00m linear /dev/loop0(0)
116 lines
3.9 KiB
Bash
116 lines
3.9 KiB
Bash
#!/usr/bin/env bash
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# Copyright (C) 2014-2015 Red Hat, Inc. All rights reserved.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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# Exercise usage of stacked cache volume using raid volume
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SKIP_WITH_LVMPOLLD=1
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. lib/inittest
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aux have_cache 1 3 0 || skip
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aux have_raid 1 0 0 || skip
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aux lvmconf 'global/cache_disabled_features = [ "policy_smq" ]'
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aux prepare_vg 5 80
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# Bug 1095843
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# lvcreate RAID1 origin, lvcreate cache-pool, and lvconvert to cache
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lvcreate --type raid1 -m 1 --nosync -l 2 -n $lv1 $vg
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lvcreate --type cache-pool -l 1 -n ${lv1}_cachepool $vg
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lvconvert --cache -Zy --cachepool $vg/${lv1}_cachepool $vg/$lv1
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check lv_exists $vg/${lv1}_corig_rimage_0 # ensure images are properly renamed
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dmsetup table ${vg}-$lv1 | grep cache # ensure it is loaded in kernel
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lvremove -f $vg
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# lvcreate RAID1 origin, lvcreate RAID1 cache-pool, and lvconvert to cache
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lvcreate --type raid1 -m 1 --nosync -l 2 -n $lv1 $vg
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lvcreate --type raid1 -m 1 --nosync -l 2 -n ${lv1}_cachepool $vg
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#should lvs -a $vg/${lv1}_cdata_rimage_0 # ensure images are properly renamed
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lvconvert --yes --type cache --cachemode writeback --cachepool $vg/${lv1}_cachepool $vg/$lv1 2>&1 | tee out
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grep "WARNING: Data redundancy could be lost" out
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check lv_exists $vg/${lv1}_corig_rimage_0 # ensure images are properly renamed
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dmsetup table ${vg}-$lv1 | grep cache # ensure it is loaded in kernel
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lvremove -f $vg
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lvcreate -n corigin -m 1 --type raid1 --nosync -l 10 $vg
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lvcreate -n cpool --type cache $vg/corigin --cachemode writeback -l 10 2>&1 | tee out
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grep "WARNING: Data redundancy could be lost" out
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not lvconvert --splitmirrors 1 --name split $vg/corigin "$dev1"
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lvconvert --yes --splitmirrors 1 --name split $vg/corigin "$dev1"
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lvremove -f $vg
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lvcreate -n cpool_meta -m 1 --type raid1 -l 10 $vg
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lvcreate -n cpool -m 1 --type raid1 -l 10 $vg
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aux wait_for_sync $vg cpool_meta
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aux wait_for_sync $vg cpool
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lvs -a -o+seg_pe_ranges $vg
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lvconvert --yes --type cache-pool --poolmetadata $vg/cpool_meta $vg/cpool
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lvcreate -n corigin --type cache --cachepool $vg/cpool -l 10
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lvchange --syncaction repair $vg/cpool_cmeta
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aux wait_for_sync $vg cpool_cmeta
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lvchange --syncaction repair $vg/cpool_cdata
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aux wait_for_sync $vg cpool_cdata
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lvconvert -y --repair $vg/cpool_cmeta
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lvconvert -y --repair $vg/cpool_cdata
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# do not allow reserved names for *new* LVs
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not lvconvert --splitmirrors 1 --name split_cmeta $vg/cpool_cmeta "$dev1"
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not lvconvert --splitmirrors 1 --name split_cdata $vg/cpool_cdata "$dev1"
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# but allow manipulating existing LVs with reserved names
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aux wait_for_sync $vg cpool_cmeta
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aux wait_for_sync $vg cpool_cdata
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lvconvert --yes --splitmirrors 1 --name split_meta $vg/cpool_cmeta "$dev1"
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lvconvert --yes --splitmirrors 1 --name split_data $vg/cpool_cdata "$dev1"
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not lvconvert --splitmirrors 1 --name split_data $vg/cpool_cdata "$dev1"
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lvremove -f $vg
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# Test up/down raid conversion of cache pool data and metadata
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lvcreate -l 10 -n cp1 $vg
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lvconvert -y --type cache-pool $vg/cp1
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lvcreate -l 20 -n co1 $vg
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lvconvert -y --type cache --cachepool cp1 $vg/co1
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lvconvert -y -m +1 --type raid1 $vg/cp1_cmeta
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check lv_field $vg/cp1_cmeta layout "raid,raid1"
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check lv_field $vg/cp1_cmeta role "private,cache,pool,metadata"
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lvconvert -y -m +1 --type raid1 $vg/cp1_cdata
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check lv_field $vg/cp1_cdata layout "raid,raid1"
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check lv_field $vg/cp1_cdata role "private,cache,pool,data"
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sleep 5
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lvs -a -o+devices $vg
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not lvconvert -m -1 $vg/cp1_cmeta
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lvconvert -y -m -1 $vg/cp1_cmeta
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check lv_field $vg/cp1_cmeta layout "linear"
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lvconvert -y -m -1 $vg/cp1_cdata
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check lv_field $vg/cp1_cdata layout "linear"
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lvremove -f $vg
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vgremove -f $vg
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