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b123a82d73
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
105 lines
3.0 KiB
Bash
105 lines
3.0 KiB
Bash
# 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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which mkfs.ext3 || exit 200
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# Get linux minor version
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linux_minor=$(echo `uname -r` | cut -d'.' -f3 | cut -d'-' -f1)
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test $linux_minor -ge 31 || exit 200
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. ./test-utils.sh
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check_logical_block_size()
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{
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local DEV_=$1
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local LOGICAL_BS=$2
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# Verify logical_block_size - requires Linux >= 2.6.31
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SYSFS_LOGICAL_BLOCK_SIZE=`echo /sys/block/$(basename $DEV_)/queue/logical_block_size`
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if [ -f "$SYSFS_LOGICAL_BLOCK_SIZE" ] ; then
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ACTUAL_LOGICAL_BLOCK_SIZE=`cat $SYSFS_LOGICAL_BLOCK_SIZE`
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test $ACTUAL_LOGICAL_BLOCK_SIZE = $LOGICAL_BS
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fi
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}
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lvdev_()
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{
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echo "$DM_DEV_DIR/$1/$2"
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}
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test_snapshot_mount()
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{
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lvcreate -L 16M -n $lv1 $vg $dev1
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mkfs.ext3 $(lvdev_ $vg $lv1)
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mkdir test_mnt
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mount $(lvdev_ $vg $lv1) test_mnt
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lvcreate -L 16M -n $lv2 -s $vg/$lv1
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umount test_mnt
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# mount the origin
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mount $(lvdev_ $vg $lv1) test_mnt
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umount test_mnt
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# mount the snapshot
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mount $(lvdev_ $vg $lv2) test_mnt
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umount test_mnt
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rm -r test_mnt
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vgchange -an $vg
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lvremove -f $vg/$lv2
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lvremove -f $vg/$lv1
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}
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# FIXME add more topology-specific tests and validation (striped LVs, etc)
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NUM_DEVS=1
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PER_DEV_SIZE=34
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DEV_SIZE=$(($NUM_DEVS*$PER_DEV_SIZE))
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# ---------------------------------------------
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# Create "desktop-class" 4K drive
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# (logical_block_size=512, physical_block_size=4096, alignment_offset=0):
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LOGICAL_BLOCK_SIZE=512
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prepare_scsi_debug_dev $DEV_SIZE \
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sector_size=$LOGICAL_BLOCK_SIZE physblk_exp=3
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check_logical_block_size $SCSI_DEBUG_DEV $LOGICAL_BLOCK_SIZE
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aux prepare_pvs $NUM_DEVS $PER_DEV_SIZE
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vgcreate -c n $vg $devs
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test_snapshot_mount
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vgremove $vg
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cleanup_scsi_debug_dev
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# ---------------------------------------------
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# Create "desktop-class" 4K drive w/ 63-sector DOS partition compensation
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# (logical_block_size=512, physical_block_size=4096, alignment_offset=3584):
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LOGICAL_BLOCK_SIZE=512
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prepare_scsi_debug_dev $DEV_SIZE \
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sector_size=$LOGICAL_BLOCK_SIZE physblk_exp=3 lowest_aligned=7
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check_logical_block_size $SCSI_DEBUG_DEV $LOGICAL_BLOCK_SIZE
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aux prepare_pvs $NUM_DEVS $PER_DEV_SIZE
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vgcreate -c n $vg $devs
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test_snapshot_mount
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vgremove $vg
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cleanup_scsi_debug_dev
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# ---------------------------------------------
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# Create "enterprise-class" 4K drive
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# (logical_block_size=4096, physical_block_size=4096, alignment_offset=0):
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LOGICAL_BLOCK_SIZE=4096
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prepare_scsi_debug_dev $DEV_SIZE \
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sector_size=$LOGICAL_BLOCK_SIZE
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check_logical_block_size $SCSI_DEBUG_DEV $LOGICAL_BLOCK_SIZE
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aux prepare_pvs $NUM_DEVS $PER_DEV_SIZE
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vgcreate -c n $vg $devs
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test_snapshot_mount
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vgremove $vg
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