The RAID implementation keeps track of which parts of a RAID LV are
synchronized. This uses a bitmap saved in the RAID metadata. The bitmap
can exclude large parts of the LV from synchronization to reduce the
-amount of work. Without this, the entire LV would need to be synchronized
-every time it was activated. When a RAID LV is first created and
-activated the first synchronization is called initialization.
+amount of work after a crash. Without this, the entire LV would need
+to be synchronized every time it was activated. When a RAID LV is
+first created and activated the first synchronization is called initialization.
Automatic synchronization happens when a RAID LV is activated, but it is
usually partial because the bitmaps reduce the areas that are checked.
-A full sync may become necessary when devices in the RAID LV are changed.
+A full sync becomes necessary when devices in the RAID LV are replaced.
The synchronization status of a RAID LV is reported by the
-following command, where "image synced" means sync is complete:
+following command, where "Cpy%Sync" = "100%" means sync is complete:
.B lvs -a -o name,sync_percent
RAID takeover is converting a RAID LV from one RAID level to another, e.g.
raid5 to raid6. Changing the RAID level is usually done to increase or
-decrease resilience to device failures. This is done using lvconvert and
-specifying the new RAID level as the LV type:
+decrease resilience to device failures or to restripe LVs. This is done
+using lvconvert and specifying the new RAID level as the LV type:
.B lvconvert --type
.I RaidLevel