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lvconvert: add raid1 <-> raid4 conversion

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In addition to the already supported conversion between 2-legged
raid1 and raid5, raid1 and raid4 can be also converted into each
other with 2 legs (raid4/5 are limited to map a 2-legged raid1).

This patch supports the missing raid4 conversion in the sequence
linear -> 2-legged raid1 -> raid4/5, then restripe to more than one
data stripes for performance and resilience reasons and optionally
convert to striped/raid0.

The other conversion sequence is also possible by converting N-way
striped/raid0 to raid4/5, then restripe to 2 legs followed by a
conversion to raid1 and optionally to linear (loosing all resilience).
This commit is contained in:
Heinz Mauelshagen 2017-03-09 23:17:13 +01:00
parent d2aae8cff4
commit f2d7a48418
1 changed files with 4 additions and 3 deletions
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7
lib/metadata/raid_manip.c
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@ -4344,12 +4344,12 @@ static struct possible_takeover_reshape_type _possible_takeover_reshape_types[]
/* raid1 -> raid5* with 2 legs */
{ .current_types = SEG_RAID1,
.possible_types = SEG_RAID5_LS|SEG_RAID5_RS|SEG_RAID5_RA|SEG_RAID5_LA|SEG_RAID5_N,
.possible_types = SEG_RAID4|SEG_RAID5_LS|SEG_RAID5_RS|SEG_RAID5_RA|SEG_RAID5_LA|SEG_RAID5_N,
.current_areas = 2U,
.options = ALLOW_REGION_SIZE|ALLOW_STRIPE_SIZE },
/* raid5* -> raid1 with 2 legs */
{ .current_types = SEG_RAID5_LS|SEG_RAID5_RS|SEG_RAID5_RA|SEG_RAID5_LA|SEG_RAID5_N,
{ .current_types = SEG_RAID4|SEG_RAID5_LS|SEG_RAID5_RS|SEG_RAID5_RA|SEG_RAID5_LA|SEG_RAID5_N,
.possible_types = SEG_RAID1,
.current_areas = 2U,
.options = ALLOW_REGION_SIZE },
@ -5099,7 +5099,7 @@ static int _takeover_upconvert_wrapper(TAKEOVER_FN_ARGS)
lvseg_name(seg), display_lvname(lv), new_segtype->name);
return 0;
}
if (!segtype_is_any_raid5(new_segtype)) {
if (!segtype_is_raid4(new_segtype) && !segtype_is_any_raid5(new_segtype)) {
log_error("Can't convert %s LV %s to %s.",
lvseg_name(seg), display_lvname(lv), new_segtype->name);
return 0;
@ -5176,6 +5176,7 @@ static int _takeover_upconvert_wrapper(TAKEOVER_FN_ARGS)
seg->data_copies = new_data_copies;
if (segtype_is_raid4(new_segtype) &&
seg->area_count != 2 &&
(!_shift_parity_dev(seg) ||
!_rename_area_lvs(lv, "_"))) {
log_error("Can't convert %s to %s.", display_lvname(lv), new_segtype->name);