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man: explain deletion of 1st group member in dmstats.8.in

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Although the use of the first region_id in a group to store the
DMS_GROUP=... aux_data tag is an internal implementation detail,
it has a user visible consequence in that deleting this region will
cause the group to disappear: add an explanation of this to the
'group' command and 'Regions, areas, and groups' section.
This commit is contained in:
Bryn M. Reeves 2016-08-08 19:29:12 +01:00
parent 4bcbcdb1a2
commit dad02900f1
1 changed files with 15 additions and 2 deletions
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17
man/dmstats.8.in
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@ -600,6 +600,11 @@ the number of histogram bins and their bounds must match exactly.
On success the group list and newly created \fBgroup_id\fP are
printed to stdout.
The group metadata is stored with the first (lowest numbered)
\fBregion_id\fP in the group: deleting this region will also delete
the group and other group members will be returned to their prior
state.
.
.HP
.CMD_HELP
@ -672,8 +677,16 @@ each with its own counter set. In this case a summary value for the
entire region is also available for use in reports.
In addition, one or more regions on one device can be combined into
a statistics group allowing reporting of aggregate values for all
regions and areas making up the group.
a statistics group. Groups allow several regions to be aggregated and
reported as a single entity; counters for all regions and areas are
summed and used to report totals for all group members. Groups also
permit the assignment of an optional alias, allowing meaningful names
to be associated with sets of regions.
The group metadata is stored with the first (lowest numbered)
\fBregion_id\fP in the group: deleting this region will also delete
the group and other group members will be returned to their prior
state.
By default new regions span the entire device. The \fB\-\-start\fP and
\fB\-\-length\fP options allows a region of any size to be placed at any