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@@ -122,3 +122,47 @@ volumeGroup-base: 0 2097152 snapshot-merge 254:11 254:12 P 16
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brw------- 1 root root 254, 11 29 ago 18:15 /dev/mapper/volumeGroup-base-real
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brw------- 1 root root 254, 12 29 ago 18:16 /dev/mapper/volumeGroup-base-cow
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brw------- 1 root root 254, 10 29 ago 18:16 /dev/mapper/volumeGroup-base
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+
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+
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+How to determine when a merging is complete
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+===========================================
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+The snapshot-merge and snapshot status lines end with:
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+ <sectors_allocated>/<total_sectors> <metadata_sectors>
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+
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+Both <sectors_allocated> and <total_sectors> include both data and metadata.
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+During merging, the number of sectors allocated gets smaller and
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+smaller. Merging has finished when the number of sectors holding data
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+is zero, in other words <sectors_allocated> == <metadata_sectors>.
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+
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+Here is a practical example (using a hybrid of lvm and dmsetup commands):
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+
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+# lvs
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+ LV VG Attr LSize Origin Snap% Move Log Copy% Convert
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+ base volumeGroup owi-a- 4.00g
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+ snap volumeGroup swi-a- 1.00g base 18.97
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+
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+# dmsetup status volumeGroup-snap
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+0 8388608 snapshot 397896/2097152 1560
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+ ^^^^ metadata sectors
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+
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+# lvconvert --merge -b volumeGroup/snap
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+ Merging of volume snap started.
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+
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+# lvs volumeGroup/snap
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+ LV VG Attr LSize Origin Snap% Move Log Copy% Convert
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+ base volumeGroup Owi-a- 4.00g 17.23
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+
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+# dmsetup status volumeGroup-base
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+0 8388608 snapshot-merge 281688/2097152 1104
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+
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+# dmsetup status volumeGroup-base
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+0 8388608 snapshot-merge 180480/2097152 712
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+
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+# dmsetup status volumeGroup-base
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+0 8388608 snapshot-merge 16/2097152 16
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+
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+Merging has finished.
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+
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+# lvs
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+ LV VG Attr LSize Origin Snap% Move Log Copy% Convert
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+ base volumeGroup owi-a- 4.00g
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