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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)
89 lines
1.8 KiB
Bash
89 lines
1.8 KiB
Bash
#!/usr/bin/env bash
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# Copyright (C) 2017 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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# Test single lv cache with non-linear lvs
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SKIP_WITH_LVMPOLLD=1
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. lib/inittest
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mount_dir="mnt"
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mkdir -p $mount_dir
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# generate random data
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dmesg > pattern1
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ps aux >> pattern1
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aux prepare_devs 4 64
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vgcreate $SHARED $vg "$dev1" "$dev2" "$dev3" "$dev4"
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lvcreate --type raid1 -n $lv1 -l 8 -an $vg "$dev1" "$dev2"
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lvcreate --type raid1 -n $lv2 -l 4 -an $vg "$dev3" "$dev4"
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# test1: create fs on LV before cache is attached
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lvchange -ay $vg/$lv1
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mkfs.xfs -f -s size=4096 "$DM_DEV_DIR/$vg/$lv1"
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mount "$DM_DEV_DIR/$vg/$lv1" $mount_dir
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cp pattern1 $mount_dir/pattern1
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umount $mount_dir
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lvchange -an $vg/$lv1
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lvconvert -y --type cache --cachepool $lv2 $vg/$lv1
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check lv_field $vg/$lv1 segtype cache
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lvs -a $vg/$lv2 --noheadings -o segtype >out
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grep raid1 out
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lvchange -ay $vg/$lv1
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mount "$DM_DEV_DIR/$vg/$lv1" $mount_dir
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diff pattern1 $mount_dir/pattern1
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cp pattern1 $mount_dir/pattern1b
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ls -l $mount_dir
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umount $mount_dir
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lvchange -an $vg/$lv1
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lvconvert --splitcache $vg/$lv1
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check lv_field $vg/$lv1 segtype raid1
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check lv_field $vg/$lv2 segtype raid1
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lvchange -ay $vg/$lv1
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lvchange -ay $vg/$lv2
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mount "$DM_DEV_DIR/$vg/$lv1" $mount_dir
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ls -l $mount_dir
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diff pattern1 $mount_dir/pattern1
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diff pattern1 $mount_dir/pattern1b
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umount $mount_dir
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lvchange -an $vg/$lv1
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lvchange -an $vg/$lv2
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vgremove -ff $vg
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