AWS Storage Gateway User Guide
Understanding Volume Metrics
6. Configure the actions to take for the alarm state. For example, you can have an email notification
sent to you.
7. Choose Create Alarm.
Understanding Volume Metrics
You can find information following about the Storage Gateway metrics that cover a volume of a gateway.
Each volume of a gateway has a set of metrics associated with it. Note that some volume-specific metrics
have the same name as certain gateway-specific metrics. These metrics represent the same kinds of
measurements but are scoped to the volume instead of the gateway. You must always specify whether
you want to work with either a gateway or a volume metric before working with a metric. Specifically,
when working with volume metrics, you must specify the VolumeId that identifies the storage volume
for which you are interested in viewing metrics. For more information, see Using Amazon CloudWatch
Metrics (p. 205).
The following table describes the Storage Gateway metrics that you can use to get information about
your storage volumes.
Metric Description Cached volumes Stored volumes
CacheHitPercent Percent of application
read operations from
the volume that are
served from cache. The
sample is taken at the
end of the reporting
period.
When there are no
application read
operations from the
volume, this metric
reports 100 percent.
Units: Percent
yes no
CachePercentDirty The volume's
contribution to the
overall percentage of
the gateway's cache
that has not been
persisted to AWS. The
sample is taken at the
end of the reporting
period.
Use the
CachePercentDirty
metric of the gateway
to view the overall
percentage of the
gateway's cache that
has not been persisted
to AWS. For more
information, see
yes no
API Version 2013-06-30
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