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2b3a4adff8
The new standard in the storage industry is to default alignment of data
areas to 1MB. fdisk, parted, and mdadm have all been updated to this
default.
Update LVM to align the PV's data area start (pe_start) to 1MB. This
provides a more useful default than the previous default of 64K (which
generally ended up being a 192K pe_start once the first metadata area
was created).
Before this patch:
# pvs -o name,vg_mda_size,pe_start
PV VMdaSize 1st PE
/dev/sdd 188.00k 192.00k
After this patch:
# pvs -o name,vg_mda_size,pe_start
PV VMdaSize 1st PE
/dev/sdd 1020.00k 1.00m
The heuristic for setting the default alignment for LVM data areas is:
- If the default value (1MB) is a multiple of the detected alignment
then just use the default.
- Otherwise, use the detected value.
In practice this means we'll almost always use 1MB -- that is unless:
- the alignment was explicitly specified with --dataalignment
- or MD's full stripe width, or the {minimum,optimal}_io_size exceeds
1MB
- or the specified/detected value is not a power-of-2
130 lines
3.5 KiB
Bash
130 lines
3.5 KiB
Bash
# Copyright (C) 2008 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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#
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# Exercise various vgextend commands
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#
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. ./test-utils.sh
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aux prepare_devs 5
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for mdatype in 1 2
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do
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# Explicit pvcreate
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pvcreate -M$mdatype $dev1 $dev2 $dev3 $dev4 $dev5
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vgcreate -M$mdatype $vg1 $dev1 $dev2
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vgextend $vg1 $dev3 $dev4 $dev5
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vgremove -ff $vg1
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# Implicit pvcreate
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pvremove $dev1 $dev2 $dev3 $dev4 $dev5
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vgcreate -M$mdatype $vg1 $dev1 $dev2
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vgextend -M$mdatype $vg1 $dev3 $dev4 $dev5
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vgremove -ff $vg1
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pvremove $dev1 $dev2 $dev3 $dev4 $dev5
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done
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# Implicit pvcreate tests, test pvcreate options on vgcreate
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# --force, --yes, --metadata{size|copies|type}, --zero
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# --dataalignment[offset]
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vgcreate $vg $dev2
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vgextend --force --yes --zero y $vg $dev1
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vgreduce $vg $dev1
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pvremove -f $dev1
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for i in 0 1 2 3
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do
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# vgcreate (lvm2) succeeds writing LVM label at sector $i
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vgextend --labelsector $i $vg $dev1
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dd if=$dev1 bs=512 skip=$i count=1 2>/dev/null | strings | grep -q LABELONE;
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vgreduce $vg $dev1
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pvremove -f $dev1
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done
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# pvmetadatacopies
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for i in 0 1 2
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do
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vgextend --pvmetadatacopies $i $vg $dev1
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check_pv_field_ $dev1 pv_mda_count $i
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vgreduce $vg $dev1
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pvremove -f $dev1
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done
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# metadatasize, dataalignment, dataalignmentoffset
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#COMM 'pvcreate sets data offset next to mda area'
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vgextend --metadatasize 100k --dataalignment 100k $vg $dev1
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check_pv_field_ $dev1 pe_start 200.00k
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vgreduce $vg $dev1
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pvremove -f $dev1
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# data area is aligned to 1M by default,
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# data area start is shifted by the specified alignment_offset
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pv_align="1052160B" # 1048576 + (7*512)
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vgextend --metadatasize 128k --dataalignmentoffset 7s $vg $dev1
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check_pv_field_ $dev1 pe_start $pv_align "--units b"
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vgremove -f $vg
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pvremove -f $dev1
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# vgextend fails if pv belongs to existing vg
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vgcreate $vg1 $dev1 $dev3
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vgcreate $vg2 $dev2
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not vgextend $vg2 $dev3
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vgremove -f $vg1
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vgremove -f $vg2
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pvremove -f $dev1 $dev2 $dev3
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#vgextend fails if vg is not resizeable
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vgcreate $vg1 $dev1 $dev2
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vgchange --resizeable n $vg1
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not vgextend $vg1 $dev3
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vgremove -f $vg1
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pvremove -f $dev1 $dev2
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# all PVs exist in the VG after extended
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pvcreate $dev1
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vgcreate $vg1 $dev2
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vgextend $vg1 $dev1 $dev3
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check_pv_field_ $dev1 vg_name $vg1
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check_pv_field_ $dev2 vg_name $vg1
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check_pv_field_ $dev3 vg_name $vg1
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vgremove -f $vg1
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pvremove -f $dev1 $dev2 $dev3
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echo test vgextend --metadataignore
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for mdacp in 1 2; do
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for ignore in y n; do
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echo vgextend --metadataignore has proper mda_count and mda_used_count
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vgcreate $vg $dev3
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vgextend --metadataignore $ignore --pvmetadatacopies $mdacp $vg $dev1 $dev2
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check_pv_field_ $dev1 pv_mda_count $mdacp
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check_pv_field_ $dev2 pv_mda_count $mdacp
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if [ $ignore = y ]; then
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check_pv_field_ $dev1 pv_mda_used_count 0
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check_pv_field_ $dev2 pv_mda_used_count 0
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else
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check_pv_field_ $dev1 pv_mda_used_count $mdacp
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check_pv_field_ $dev2 pv_mda_used_count $mdacp
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fi
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echo vg has proper vg_mda_count and vg_mda_used_count
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check_vg_field_ $vg vg_mda_count $(($mdacp * 2 + 1))
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if [ $ignore = y ]; then
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check_vg_field_ $vg vg_mda_used_count 1
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else
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check_vg_field_ $vg vg_mda_used_count $(($mdacp * 2 + 1))
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fi
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check_vg_field_ $vg vg_mda_copies unmanaged
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vgremove $vg
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pvremove -ff $dev1 $dev2 $dev3
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done
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done
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