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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
192 lines
6.1 KiB
Bash
Executable File
192 lines
6.1 KiB
Bash
Executable File
#!/bin/sh
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# 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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test_description='Test pvcreate option values'
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PAGESIZE=$(getconf PAGESIZE)
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. ./test-utils.sh
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aux prepare_devs 4
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#COMM 'pvcreate rejects negative setphysicalvolumesize'
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not pvcreate --setphysicalvolumesize -1024 $dev1
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#COMM 'pvcreate rejects negative metadatasize'
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not pvcreate --metadatasize -1024 $dev1
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# x. metadatasize 0, defaults to 255
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# FIXME: unable to check default value, not in reporting cmds
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# should default to 255 according to code
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# check_pv_field_ pv_mda_size 255
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#COMM 'pvcreate accepts metadatasize 0'
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pvcreate --metadatasize 0 $dev1
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pvremove $dev1
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#Verify vg_mda_size is smaller pv_mda_size
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pvcreate --metadatasize 512k $dev1
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pvcreate --metadatasize 96k $dev2
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vgcreate $vg $dev1 $dev2
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compare_two_fields_ vgs $vg vg_mda_size pvs $dev2 pv_mda_size
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vgremove -ff $vg
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# x. metadatasize too large
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# For some reason we allow this, even though there's no room for data?
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##COMM 'pvcreate rejects metadatasize too large'
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#not pvcreate --metadatasize 100000000000000 $dev1
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#COMM 'pvcreate rejects metadatacopies < 0'
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not pvcreate --metadatacopies -1 $dev1
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#COMM 'pvcreate accepts metadatacopies = 0, 1, 2'
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for j in metadatacopies pvmetadatacopies
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do
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pvcreate --$j 0 $dev1
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pvcreate --$j 1 $dev2
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pvcreate --$j 2 $dev3
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check_pv_field_ $dev1 pv_mda_count 0
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check_pv_field_ $dev2 pv_mda_count 1
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check_pv_field_ $dev3 pv_mda_count 2
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pvremove $dev1
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pvremove $dev2
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pvremove $dev3
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done
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#COMM 'pvcreate rejects metadatacopies > 2'
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not pvcreate --metadatacopies 3 $dev1
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#COMM 'pvcreate rejects invalid device'
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not pvcreate $dev1bogus
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#COMM 'pvcreate rejects labelsector < 0'
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not pvcreate --labelsector -1 $dev1
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#COMM 'pvcreate rejects labelsector > 1000000000000'
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not pvcreate --labelsector 1000000000000 $dev1
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# other possibilites based on code inspection (not sure how hard)
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# x. device too small (min of 512 * 1024 KB)
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# x. device filtered out
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# x. unable to open /dev/urandom RDONLY
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# x. device too large (pe_count > UINT32_MAX)
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# x. device read-only
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# x. unable to open device readonly
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# x. BLKGETSIZE64 fails
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# x. set size to value inconsistent with device / PE size
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#COMM 'pvcreate basic dataalignment sanity checks'
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not pvcreate --dataalignment -1 $dev1
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not pvcreate -M 1 --dataalignment 1 $dev1
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not pvcreate --dataalignment 1e $dev1
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#COMM 'pvcreate always rounded up to page size for start of device'
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#pvcreate --metadatacopies 0 --dataalignment 1 $dev1
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# amuse shell experts
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#check_pv_field_ $dev1 pe_start $(($(getconf PAGESIZE)/1024))".00k"
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#COMM 'pvcreate sets data offset directly'
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pvcreate --dataalignment 512k $dev1
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check_pv_field_ $dev1 pe_start 512.00k
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#COMM 'vgcreate/vgremove do not modify data offset of existing PV'
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vgcreate $vg $dev1 --config 'devices { data_alignment = 1024 }'
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check_pv_field_ $dev1 pe_start 512.00k
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vgremove $vg --config 'devices { data_alignment = 1024 }'
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check_pv_field_ $dev1 pe_start 512.00k
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#COMM 'pvcreate sets data offset next to mda area'
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pvcreate --metadatasize 100k --dataalignment 100k $dev1
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check_pv_field_ $dev1 pe_start 200.00k
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# metadata area start is aligned according to pagesize
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# pagesize should be 64k or 4k ...
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if [ $PAGESIZE -eq 65536 ] ; then
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pv_align="192.50k"
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else
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pv_align="133.00k"
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fi
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pvcreate --metadatasize 128k --dataalignment 3.5k $dev1
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check_pv_field_ $dev1 pe_start $pv_align
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pvcreate --metadatasize 128k --metadatacopies 2 --dataalignment 3.5k $dev1
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check_pv_field_ $dev1 pe_start $pv_align
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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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pvcreate --metadatasize 128k --dataalignmentoffset 7s $dev1
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check_pv_field_ $dev1 pe_start $pv_align "--units b"
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# 2nd metadata area is created without problems when
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# data area start is shifted by the specified alignment_offset
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pvcreate --metadatasize 128k --metadatacopies 2 --dataalignmentoffset 7s $dev1
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check_pv_field_ $dev1 pv_mda_count 2
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# FIXME: compare start of 2nd mda with and without --dataalignmentoffset
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#COMM 'pv with LVM1 compatible data alignment can be convereted'
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#compatible == LVM1_PE_ALIGN == 64k
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pvcreate --dataalignment 256k $dev1
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vgcreate -s 1m $vg $dev1
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vgconvert -M1 $vg
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vgconvert -M2 $vg
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check_pv_field_ $dev1 pe_start 256.00k
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vgremove $vg
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#COMM 'pv with LVM1 incompatible data alignment cannot be convereted'
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pvcreate --dataalignment 10k $dev1
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vgcreate -s 1m $vg $dev1
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not vgconvert -M1 $vg
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vgremove $vg
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#COMM 'vgcfgrestore allows pe_start=0'
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#basically it produces nonsense, but it tests vgcfgrestore,
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#not that final cfg is usable...
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pvcreate --metadatacopies 0 $dev1
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pvcreate $dev2
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vgcreate $vg $dev1 $dev2
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vgcfgbackup -f "$(pwd)/backup.$$" $vg
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sed 's/pe_start = [0-9]*/pe_start = 0/' "$(pwd)/backup.$$" > "$(pwd)/backup.$$1"
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vgcfgrestore -f "$(pwd)/backup.$$1" $vg
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check_pv_field_ $dev1 pe_start 0
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check_pv_field_ $dev2 pe_start 0
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vgremove $vg
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echo test pvcreate --metadataignore
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for pv_in_vg in 1 0; do
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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 pvcreate --metadataignore has proper mda_count and mda_used_count
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pvcreate --metadatacopies $mdacp --metadataignore $ignore $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 vgcreate has proper vg_mda_count and vg_mda_used_count
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if [ $pv_in_vg = 1 ]; then
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vgcreate -c n "$vg" $dev1 $dev2
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check_vg_field_ $vg vg_mda_count $(($mdacp * 2))
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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))
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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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fi
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done
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done
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done
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