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During an ongoing reshape, the MD kernel runtime reads stripes relative to data_offset and starts storing the reshaped stripes (with new raid layout and/or new stripesize and/or new number of stripes) relative to new_data_offset. This is to avoid writing over any data in place which is non-atomic by nature and thus be recoverable without data loss in the transition. MD uses the term out-of-place reshaping for it. There's 2 other areas we don't have report capability for: - number of data stripes vs. total stripes (e.g. raid6 with 7 stripes toal has 5 data stripes) - number of (rotating) parity/syndrome chunks (e.g. raid6 with 7 stripes toal has 2 parity chunks; one per stripe for P-Syndrome and another one for Q-Syndrome) Thus, add the following reportable keys: - reshape_len (in current units) - reshape_len_le (in logical extents) - data_offset (in sectors) - new_data_offset ( " ) - data_stripes - parity_chunks Enhance lvchange-raid.sh, lvconvert-raid-reshape-linear_to_striped.sh, lvconvert-raid-reshape-striped_to_linear.sh, lvconvert-raid-reshape.sh and lvconvert-raid-takeover.sh to make use of new keys. Related: rhbz834579 Related: rhbz1191935 Related: rhbz1191978
208 lines
5.6 KiB
Bash
208 lines
5.6 KiB
Bash
#!/bin/sh
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# Copyright (C) 2017 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., 51 Franklin Street, Fifth Floor, Boston, MA2110-1301 USA
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SKIP_WITH_LVMLOCKD=1
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SKIP_WITH_LVMPOLLD=1
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. lib/inittest
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which mkfs.ext4 || skip
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aux have_raid 1 10 2 || skip
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aux prepare_pvs 65 64
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vgcreate -s 1M $vg $(cat DEVICES)
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function _lvcreate
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{
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local level=$1
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local req_stripes=$2
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local stripes=$3
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local size=$4
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local vg=$5
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local lv=$6
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lvcreate -y -aey --type $level -i $req_stripes -L $size -n $lv $vg
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check lv_first_seg_field $vg/$lv segtype "$level"
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check lv_first_seg_field $vg/$lv datastripes $req_stripes
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check lv_first_seg_field $vg/$lv stripes $stripes
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mkfs.ext4 "$DM_DEV_DIR/$vg/$lv"
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fsck -fn "$DM_DEV_DIR/$vg/$lv"
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}
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function _lvconvert
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{
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local req_level=$1
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local level=$2
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local data_stripes=$3
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local stripes=$4
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local vg=$5
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local lv=$6
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local region_size=$7
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local wait_and_check=1
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local R=""
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[ -n "$region_size" ] && R="-R $region_size"
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[ "${level:0:7}" = "striped" ] && wait_and_check=0
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[ "${level:0:5}" = "raid0" ] && wait_and_check=0
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lvconvert -y --ty $req_level $R $vg/$lv
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[ $? -ne 0 ] && return $?
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check lv_first_seg_field $vg/$lv segtype "$level"
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check lv_first_seg_field $vg/$lv data_stripes $data_stripes
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check lv_first_seg_field $vg/$lv stripes $stripes
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[ -n "$region_size" ] && check lv_field $vg/$lv regionsize $region_size
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if [ "$wait_and_check" -eq 1 ]
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then
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fsck -fn "$DM_DEV_DIR/$vg/$lv"
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aux wait_for_sync $vg $lv
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fi
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fsck -fn "$DM_DEV_DIR/$vg/$lv"
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}
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function _reshape_layout
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{
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local type=$1
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shift
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local data_stripes=$1
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shift
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local stripes=$1
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shift
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local vg=$1
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shift
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local lv=$1
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shift
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local opts="$*"
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local ignore_a_chars=0
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[[ "$opts" =~ "--stripes" ]] && ignore_a_chars=1
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lvconvert -vvvv -y --ty $type $opts $vg/$lv
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check lv_first_seg_field $vg/$lv segtype "$type"
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check lv_first_seg_field $vg/$lv data_stripes $data_stripes
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check lv_first_seg_field $vg/$lv stripes $stripes
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aux wait_for_sync $vg $lv $ignore_a_chars
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fsck -fn "$DM_DEV_DIR/$vg/$lv"
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}
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# Delay leg so that rebuilding status characters
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# can be read before resync finished too quick.
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# aux delay_dev "$dev1" 1
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#
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# Start out with raid5(_ls)
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#
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# Create 3-way striped raid5 (4 legs total)
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_lvcreate raid5_ls 3 4 16M $vg $lv1
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check lv_first_seg_field $vg/$lv1 segtype "raid5_ls"
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aux wait_for_sync $vg $lv1
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# Reshape it to 256K stripe size
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_reshape_layout raid5_ls 3 4 $vg $lv1 --stripesize 256K
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check lv_first_seg_field $vg/$lv1 stripesize "256.00k"
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# Convert raid5(_n) -> striped
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not _lvconvert striped striped 3 3 $vg $lv1 512k
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_reshape_layout raid5_n 3 4 $vg $lv1
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_lvconvert striped striped 3 3 $vg $lv1
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# Convert striped -> raid5_n
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_lvconvert raid5_n raid5_n 3 4 $vg $lv1 "" 1
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# Convert raid5_n -> raid5_ls
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_reshape_layout raid5_ls 3 4 $vg $lv1
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# Convert raid5_ls to 5 stripes
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_reshape_layout raid5_ls 5 6 $vg $lv1 --stripes 5
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# Convert raid5_ls back to 3 stripes
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_reshape_layout raid5_ls 3 6 $vg $lv1 --stripes 3 --force
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_reshape_layout raid5_ls 3 4 $vg $lv1 --stripes 3
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# Convert raid5_ls to 7 stripes
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_reshape_layout raid5_ls 7 8 $vg $lv1 --stripes 7
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# Convert raid5_ls to 9 stripes
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_reshape_layout raid5_ls 9 10 $vg $lv1 --stripes 9
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# Convert raid5_ls to 14 stripes
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_reshape_layout raid5_ls 14 15 $vg $lv1 --stripes 14
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# Convert raid5_ls to 63 stripes
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_reshape_layout raid5_ls 63 64 $vg $lv1 --stripes 63
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# Convert raid5_ls back to 27 stripes
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_reshape_layout raid5_ls 27 64 $vg $lv1 --stripes 27 --force
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_reshape_layout raid5_ls 27 28 $vg $lv1 --stripes 27
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# Convert raid5_ls back to 4 stripes
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_reshape_layout raid5_ls 4 28 $vg $lv1 --stripes 4 --force
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_reshape_layout raid5_ls 4 5 $vg $lv1 --stripes 4
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# Convert raid5_ls back to 3 stripes
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_reshape_layout raid5_ls 3 5 $vg $lv1 --stripes 3 --force
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_reshape_layout raid5_ls 3 4 $vg $lv1 --stripes 3
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# Convert raid5_ls -> raid5_rs
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_reshape_layout raid5_rs 3 4 $vg $lv1
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# Convert raid5_rs -> raid5_la
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_reshape_layout raid5_la 3 4 $vg $lv1
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# Convert raid5_la -> raid5_ra
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_reshape_layout raid5_ra 3 4 $vg $lv1
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# Convert raid5_ra -> raid6_ra_6
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_lvconvert raid6_ra_6 raid6_ra_6 3 5 $vg $lv1 "4.00m" 1
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# Convert raid5_la -> raid6(_zr)
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_reshape_layout raid6 3 5 $vg $lv1
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# Convert raid6(_zr) -> raid6_nc
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_reshape_layout raid6_nc 3 5 $vg $lv1
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# Convert raid6(_nc) -> raid6_nr
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_reshape_layout raid6_nr 3 5 $vg $lv1
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# Convert raid6_nr) -> raid6_rs_6
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_reshape_layout raid6_rs_6 3 5 $vg $lv1
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# Convert raid6_rs_6 to 5 stripes
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_reshape_layout raid6_rs_6 5 7 $vg $lv1 --stripes 5
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# Convert raid6_rs_6 to 4 stripes
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_reshape_layout raid6_rs_6 4 7 $vg $lv1 --stripes 4 --force
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_reshape_layout raid6_rs_6 4 6 $vg $lv1 --stripes 4
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check lv_first_seg_field $vg/$lv1 stripesize "256.00k"
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# Convert raid6_rs_6 to raid6_n_6
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_reshape_layout raid6_n_6 4 6 $vg $lv1
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# Convert raid6_n_6 -> striped
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_lvconvert striped striped 4 4 $vg $lv1
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check lv_first_seg_field $vg/$lv1 stripesize "256.00k"
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# Convert striped -> raid10(_near)
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_lvconvert raid10 raid10 4 8 $vg $lv1
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# Convert raid10 to 10 stripes and 64K stripesize
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# FIXME: change once we support odd numbers of raid10 stripes
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not _reshape_layout raid10 4 9 $vg $lv1 --stripes 9 --stripesize 64K
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_reshape_layout raid10 5 10 $vg $lv1 --stripes 10 --stripesize 64K
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check lv_first_seg_field $vg/$lv1 stripesize "64.00k"
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# Convert raid6_n_6 -> striped
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_lvconvert striped striped 5 5 $vg $lv1
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check lv_first_seg_field $vg/$lv1 stripesize "64.00k"
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vgremove -ff $vg
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