still occurring, big jump in disk used on graphite1001 some weeks ago:

{F99837}

```
graphite1001:/var/lib/carbon/whisper$ du -hcs * | sort -h
0       irc
2.3M    test
5.6M    deploy
12M     gerrit
18M     VisualEditor
54M     jvm_memory
108M    scap
186M    ocg
195M    eventlogging
249M    parsoid
318M    carbon
978M    HHVM
1.3G    ve
2.3G    kafka
2.4G    restbase
3.3G    statsd
4.1G    cassandra
4.7G    swift
6.2G    frontend
13G     mw
42G     zuul
46G     varnishkafka
58G     jobrunner
78G     MediaWiki
78G     reqstats
341G    servers
680G    total
```

so `servers` is the biggest offender, which could match up with the growth of turning up MW in codfw (on average ~380MB/server, i.e. ~380 metrics/server)

```
graphite1001:/var/lib/carbon/whisper$ du -hcs servers/* | sort -h | tail -20
1.3G    servers/ms-be1015
1.3G    servers/ms-be2001
1.3G    servers/ms-be2002
1.3G    servers/ms-be2003
1.3G    servers/ms-be2004
1.3G    servers/ms-be2005
1.3G    servers/ms-be2006
1.3G    servers/ms-be2007
1.3G    servers/ms-be2008
1.3G    servers/ms-be2009
1.3G    servers/ms-be2010
1.3G    servers/ms-be2011
1.3G    servers/ms-be2012
1.3G    servers/ms-be2013
1.3G    servers/ms-be2015
1.4G    servers/ms-be2014
2.1G    servers/labstore2001
2.6G    servers/labstore1002
4.0G    servers/labstore1001
341G    total
```

```
graphite1001:/var/lib/carbon/whisper$ du -hcs servers/labstore1001/* | sort -h
4.5M    servers/labstore1001/vmstat
5.6M    servers/labstore1001/loadavg
12M     servers/labstore1001/cpu
16M     servers/labstore1001/memory
61M     servers/labstore1001/network
81M     servers/labstore1001/diskspace
3.8G    servers/labstore1001/iostat
4.0G    total
```

the `iostat` hierarchy seems the biggest offender, 48% of total `servers`

```
graphite1001:/var/lib/carbon/whisper$ du -hcs servers/*/iostat | sort -h | tail -10
996M    servers/ms-be2012/iostat
1.1G    servers/ms-be2003/iostat
1.1G    servers/ms-be2011/iostat
1.1G    servers/ms-be2013/iostat
1.1G    servers/ms-be2014/iostat
1.1G    servers/ms-be2015/iostat
2.0G    servers/labstore2001/iostat
2.6G    servers/labstore1002/iostat
3.8G    servers/labstore1001/iostat
229G    total
```

and we count both partitions and underlying devices, however just the partitions accounts for ~half of the total `iostat` space:

```
graphite1001:/var/lib/carbon/whisper$ du -hcs servers/*/iostat/sd*[0-9] | tail -5
31M     servers/zirconium/iostat/sda1
31M     servers/zirconium/iostat/sda2
31M     servers/zirconium/iostat/sdb1
31M     servers/zirconium/iostat/sdb2
127G    total
```

so I think it makes sense to consider just disks i.e. sd* but not the partitions within those (sw raid and lvm would still be graphed of course)