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author | Bryn M. Reeves <bmr@redhat.com> | 2016-08-08 19:29:12 +0100 |
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committer | Bryn M. Reeves <bmr@redhat.com> | 2016-08-08 19:29:12 +0100 |
commit | dad02900f18d3ef9b85d78f2e42434d92e6d84c9 (patch) | |
tree | ed94c5526e3ea288da75167c2a46be405f1352d9 | |
parent | 4bcbcdb1a2f276b8139ae0ee7f66ffb342c03f23 (diff) | |
download | lvm2-dad02900f18d3ef9b85d78f2e42434d92e6d84c9.tar.gz |
man: explain deletion of 1st group member in dmstats.8.in
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.
-rw-r--r-- | man/dmstats.8.in | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/man/dmstats.8.in b/man/dmstats.8.in index befc0d501..2367b8b07 100644 --- a/man/dmstats.8.in +++ b/man/dmstats.8.in @@ -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 |