google 搜索了好多文档，终于发现了这个靠谱的回答。
https://groups.google.com/forum/#!topic/influxdb/I5eady_Ta5Y
You can see the approximate size of the InfluxDB data directory by running the following query against the `_internal` databases `shard` measurement:
```
select sum(diskBytes) / 1024 / 1024 /1024 from _internal."monitor"."shard" where time > now() - 10s
```
```
select sum(diskBytes) / 1024 / 1024 /1024 from _internal."monitor"."shard" where time > now() - 10s
```
The result will be in gigabytes. You can also see the size per database by adding a `group by "database"`:
```
select sum(diskBytes) / 1024 / 1024 /1024 from _internal."monitor"."shard" where time > now() - 10s group by "database"
```
```
select sum(diskBytes) / 1024 / 1024 /1024 from _internal."monitor"."shard" where time > now() - 10s group by "database"
```
On Fri, Nov 18, 2016 at 5:59 AM, <veerare...@gmail.com> wrote:
I would like to check disk usage percentage on a server during a load tes.
Is there any way to capture disk usage metric in influxdb?
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