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July 24th, 2017 04:00
InsightIQ - Is Logical Size the logical size of the file or the capacity used on disk for first copy?
InsightIQ - In the Capacity Reports, is Logical Size the logical size of the file or the capacity used on disk for first copy that includes the block overhead (8k for <8k files) but not the protection overhead?
I am trying to understand if a file of size 1k will show as 1k or 8k, a file of size 15k show as 15k or 128k? I cannot seem to find clear documentation on this.
OneFS version: 8.0.0.4
InsightIQ version: 4.1.1.3
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RobChang-Isilon
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July 27th, 2017 16:00
Hi jmhere,
On the Isilon cluster, each file has a logical size and a physical size. The logical size is the size of the file prior to applying data protection. The physical size of the file is the actual on-disk size of the file, with data protection applied.
For example, let's say you have a 6 KB file on a USB thumb drive. When you ingest this file onto your Isilon cluster, OneFS would report its logical size to be 6 KB, and physical size would be bigger with data protection applied (mirrored for small files).
InsightIQ merely reports what OneFS reports.
Hope this helps.
sjones51
252 Posts
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July 26th, 2017 11:00
Hi jmhere,
I found this in the Isilon InsightIQ 4.1.1 User Guide under File System report breakouts on page 50 as of the time of this post:
Logical Size
Breaks out data by logical file size. Logical file size calculations include only data,
and do not include data-protection overhead.
I would take that to believe that a 1k file would show as a 1k file.
https://support.emc.com/docu81829
jmhere
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July 28th, 2017 00:00
Many thanks RobChang-Isilon, this helps!