Documentation

Host data

Host performance data is based on volumes performance data. It aggregates attached volumes.
There is not kept performance statistics separately per host base. All is only mapping to assigned volumes
Storage usually do not to provide host based performance statistics.

Therefore data provided here do not have to be always accurate in this scenarios:
  • There is more hosts which share same volumes (typical for cluster usage)
    In this case you can see high traffic even on the stand-by cluster nodes
  • When a volume is re-assigned in time, then its historical traffic is presented under the new host instead of the original one where it has been generated.
There are exceptions when some storage are able to provide real per host based performance data.
In this case you can see real data for every attached host.
List of storage providing direct host based perf statistics:
  • Hitachi VSP-G
  • Hitachi HUS-VM
  • Dell EMC² VMAX
  • Dell EMC² XtremIO
  • Dell SC series (Compellent)
  • HPE 3PAR
  • Huawei OceanStor
  • Pure Storage
  • Infinidat InfiniBox
  • DataCore SANsymphony

Know issues

Some old Hitachi VSP/HUS-VM firmwares do not provide host data regularly.
At first check if each host/WWPN has enabled monitoring. If so then read further.
Basically it is a storage issue we cannot do anything.
If you experience a problem with host data then you might switch to volume aggregated data via this setting.
You have 2 possibilities how to do it:
  • Set that for all your VSP-G/HUS-VM 
    # su - stor2rrd (lpar2rrd user on the virtual appliance)
$ cd /home/stor2rrd/stor2rrd
$ vi etc/.magic
   # it forces to use volume based data for all Hitachi VSP/VSP-G/HUS-VM storage
   VSPG_NATIVE_HOSTS=0
   export VSPG_NATIVE_HOSTS
$ chmod 644 etc/.magic
$ rm -f tmp/[1-9].*
$ ./load.sh html
  • Specify just storage which have that issue 
    # su - stor2rrd (lpar2rrd user on the virtual appliance)
$ cd /home/stor2rrd/stor2rrd
$ vi etc/.magic
   # you can specify only storage which use volume based data when VSPG_NATIVE_HOSTS=0
   # when you comment out VSPG_NATIVE_HOSTS_EXCLUDED_LIST then VSPG_NATIVE_HOSTS=0 afects all HDS VSP/VSP-G/HUS-VM storage
   VSPG_NATIVE_HOSTS_EXCLUDED_LIST="storage-hus-vm-01 storage-hus-vm-02"
   export VSPG_NATIVE_HOSTS_EXCLUDED_LIST

   VSPG_NATIVE_HOSTS=0
   export VSPG_NATIVE_HOSTS
$ chmod 644 etc/.magic
$ rm -f tmp/[1-9].*
$ ./load.sh html
Ctrl-F5 in the browser when load.sh finishes.

When it is ok then remove per host rrdfiles: 
$ rm data/<storage name>/HOST/*rrd