Moving on to the metrics, for occupancy the key metric
is utilization. How much storage are we using and how much is available?
Below are some host metrics that are typically
available, these metrics are available at the file system, volume, or logical
disk levels.
Array Metrics
The
illustration below shows an example of occupancy metrics from the array
perspective. This is an example of Netapp filer aggregate metrics (down at the
aggregate level).
A lot of these Storage arrays, from the different
vendors, have different ways to carve up the storage. Storage groups can be configured as in this
example, using NetApp aggregates, which can have many occupancy metrics at
different levels.
Some of
the NetApp occupancy levels here are not available on the host in general.
I’ll pick
out a few of the metrics:
De-dupe – If this is turned on you can find out
how much space you’re saving
Total Committed space – A lot of vendors now offer thin
provisioning where storage can be over-committed so it looks as though there is
more storage than is really available, this allows you to see how
over-committed you really are.
athene®,
our capacity management solution, brings in metrics from any
data source so storage metrics can be part of the overall capacity
management process.
On Friday
I’ll be taking a look at Virtual Environments & Clusters.
Dale Feiste
Principal Consultant
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