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Grow: allow a RAID1 to be reshaped directly to 3-drive RAID5 

Self-tests require this but code didn't allow it any more.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2011-03-09 18:30:03 +11:00
parent bb7295f15e
commit 5652f2d9ce
1 changed files with 9 additions and 5 deletions
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14
Grow.c
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@ -952,13 +952,17 @@ char *analyse_change(struct mdinfo *info, struct reshape *re)
}
if (info->array.raid_disks == 2 &&
info->new_level == 5) {
if (info->delta_disks != UnSet &&
info->delta_disks != 0)
return "Cannot change number of disks "
"with RAID1->RAID5 conversion";
re->level = 5;
re->before.data_disks = 1;
re->after.data_disks = 1;
if (info->delta_disks != UnSet &&
info->delta_disks != 0)
re->after.data_disks = 1 + info->delta_disks;
else
re->after.data_disks = 1;
if (re->after.data_disks < 1)
return "Number of disks too small for RAID5";
re->before.layout = ALGORITHM_LEFT_SYMMETRIC;
info->array.chunk_size = 65536;
break;