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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
154 lines
3.2 KiB
Bash
154 lines
3.2 KiB
Bash
# Put lvm-related utilities here.
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# This file is sourced from test-lib.sh.
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# Copyright (C) 2007, 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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export LVM_SUPPRESS_FD_WARNINGS=1
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ME=$(basename "$0")
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warn() { echo >&2 "$ME: $@"; }
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trim()
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{
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trimmed=${1%% }
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trimmed=${trimmed## }
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echo "$trimmed"
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}
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compare_two_fields_()
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{
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local cmd1=$1;
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local obj1=$2;
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local field1=$3;
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local cmd2=$4;
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local obj2=$5;
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local field2=$6;
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local val1;
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local val2;
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val1=$($cmd1 --noheadings -o $field1 $obj1)
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val2=$($cmd2 --noheadings -o $field2 $obj2)
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if test "$verbose" = "t"
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then
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echo "compare_two_fields_ $obj1($field1): $val1 $obj2($field2): $val2"
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fi
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test "$val1" = "$val2"
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}
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compare_vg_field_()
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{
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local vg1=$1;
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local vg2=$2;
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local field=$3;
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local val1;
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local val2;
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val1=$(vgs --noheadings -o $field $vg1)
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val2=$(vgs --noheadings -o $field $vg2)
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if test "$verbose" = "t"
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then
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echo "compare_vg_field_ VG1: $val1 VG2: $val2"
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fi
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test "$val1" = "$val2"
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}
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get_pv_field() {
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local pv=$1
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local field=$2
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local value
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pvs --noheading -o $field $pv | sed 's/^ *//'
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}
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get_vg_field() {
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local vg=$1
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local field=$2
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local value
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vgs --noheading -o $field $vg | sed 's/^ *//'
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}
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get_lv_field() {
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local lv=$1
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local field=$2
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local value
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lvs --noheading -o $field $lv | sed 's/^ *//'
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}
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check_vg_field_()
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{
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local vg=$1;
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local field=$2;
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local expected=$3;
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local actual;
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actual=$(trim $(vgs --noheadings -o $field $vg))
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if test "$verbose" = "t"
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then
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echo "check_vg_field_ VG=$vg, field=$field, actual=$actual, expected=$expected"
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fi
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test "$actual" = "$expected"
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}
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check_pv_field_()
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{
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local pv=$1;
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local field=$2;
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local expected=$3;
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local pvs_args=$4; # optional
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local actual;
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actual=$(trim $(pvs --noheadings $pvs_args -o $field $pv))
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if test "$verbose" = "t"
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then
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echo "check_pv_field_ PV=$pv, field=$field, actual=$actual, expected=$expected"
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fi
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test "$actual" = "$expected"
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}
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check_lv_field_()
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{
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local lv=$1;
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local field=$2;
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local expected=$3;
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local actual;
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actual=$(trim $(lvs --noheadings -o $field $lv))
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if test "$verbose" = "t"
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then
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echo "check_lv_field_ LV=$lv, field=$field, actual=$actual, expected=$expected"
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fi
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test "$actual" = "$expected"
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}
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vg_validate_pvlv_counts_()
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{
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local local_vg=$1
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local num_pvs=$2
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local num_lvs=$3
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local num_snaps=$4
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lvs -a -o+devices $local_vg
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check_vg_field_ $local_vg pv_count $num_pvs && \
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check_vg_field_ $local_vg lv_count $num_lvs && \
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check_vg_field_ $local_vg snap_count $num_snaps
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}
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dmsetup_has_dm_devdir_support_()
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{
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# Detect support for the envvar. If it's supported, the
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# following command will fail with the expected diagnostic.
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out=$(DM_DEV_DIR=j dmsetup version 2>&1)
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test "$?:$out" = "1:Invalid DM_DEV_DIR envvar value." -o \
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"$?:$out" = "1:Invalid DM_DEV_DIR environment variable value."
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}
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