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to lvm.conf in the activation section: 'snapshot_autoextend_threshold' and 'snapshot_autoextend_percent', that define how to handle automatic snapshot extension. The former defines when the snapshot should be extended: when its space usage exceeds this many percent. The latter defines how much extra space should be allocated for the snapshot, in percent of its current size.
48 lines
1.0 KiB
Bash
48 lines
1.0 KiB
Bash
#!/bin/bash
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# Copyright (C) 2010 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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. ./test-utils.sh
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extend() {
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lvextend --use-policies --config "activation { snapshot_extend_threshold = $1 }" $vg/snap
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}
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write() {
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mount $DM_DEV_DIR/$vg/snap mnt
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dd if=/dev/zero of=mnt/file$1 bs=1k count=$2
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umount mnt
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}
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percent() {
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lvs $vg/snap -o snap_percent --noheadings | cut -c4- | cut -d. -f1
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}
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which mkfs.ext2 || exit 200
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aux prepare_vg 2
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lvcreate -l 8 -n base $vg
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mkfs.ext2 $DM_DEV_DIR/$vg/base
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lvcreate -s -l 4 -n snap $vg/base
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mkdir mnt
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write 1 4096
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pre=`percent`
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extend 50
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post=`percent`
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test $pre = $post
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write 2 4096
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pre=`percent`
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extend 50
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post=`percent`
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test $pre -gt $post
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