AWS Storage Gateway User Guide
Monitoring Cache Storage
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Monitoring Cache Storage
You can find information following about how to monitor a gateway's cache storage and how to create
an alarm so that you get a notification when parameters of the cache pass specified thresholds. Using
this alarm, you know when to proactively add cache storage to a gateway.
You only monitor cache storage in the cached volumes architecture. For more information, see How AWS
Storage Gateway Works (Architecture) (p. 2).
Item of Interest How to Measure
Total usage of cache Use the CachePercentUsed and TotalCacheSize metrics with the
Average statistic. For example, use the CachePercentUsed with the
Average statistic to analyze the cache usage over a period of time.
The TotalCacheSize metric changes only when you add cache to the
gateway.
Percentage of read
requests that are
served from the cache
Use the CacheHitPercent metric with the Average statistic.
Typically, you want CacheHitPercent to remain high.
Percentage of cache
that is dirty—that is, it
contains content that
has not been uploaded
to AWS
Use the CachePercentDirty metrics with the Average statistic.
Typically, you want CachePercentDirty to remain low.
To measure the cache's percentage dirty for a gateway and all its volumes
1. Open the CloudWatch console at https://console.amazonaws.cn/cloudwatch/.
2. Choose the StorageGateway: Gateway Metrics dimension, and find the gateway that you want to
work with.
3. Choose the CachePercentDirty metric.
4. For Time Range, choose a value.
5. Choose the Average statistic.
6. For Period, choose a value of 5 minutes to match the default reporting time.
The resulting time-ordered set of data points contains the percentage of the cache that is dirty over the
5 minutes.
API Version 2013-06-30
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