improve details of the inventory

policy/tpa-rfc-56-large-file-storage.md

@@ -110,12 +110,23 @@ issue [tpo/tpa/team#40478][].
 
 ## Storage usage analysis
 
-[According to Grafana][], TPA manages around 111TB of available
-storage, with 71TB in use.
+[According to Grafana][], TPA manages around 60TiB of storage with a
+capacity of over 160TiB, which includes 60TiB of un-allocated space on
+[LVM volume groups][]. 
 
-TODO: redo the graphs in https://gitlab.torproject.org/tpo/tpa/team/-/issues/40478#note_2760208
+About 40TiB of storage is used by the backup storage server and 7TiB
+by the archive servers, which puts our normal disk usage at less than
+15TiB spread over a little over 60 virtual machines.
 
-[According to Grafana]: https://grafana.torproject.org/d/wUmZB05Zk/tpo-overview?orgId=1&viewPanel=30&from=now-1y&to=now
+[According to Grafana]: https://grafana.torproject.org/d/zbCoGRjnz/disk-usage?orgId=1
+[LVM volume groups]: https://grafana.torproject.org/d/f7887271-1a77-4138-ad16-28be8b0ad0ab/lvm-disk-usage?orgId=1
+
+Other large consumers include:
+
+ * GitLab: TODO
+ * mirrors:
+ * metrics
+ * etc
 
 # Proposal