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Regarding the perf-stats-daily-summary-[a | b].csv

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e-series-systems
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esg
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E-Series

Answer

Q1: There are performance data such as IOPs and CPU from the 1st column to the 28th column (up to the AL column), but is this value correct on a per-controller basis?
A1: Yes, it is.
 
Q2: From the 29th column (AM column) onwards, the data is written in units of Ch:. What does Ch: mean?
A2: It's an abbreviation for 'channel'. For example, 'D00' means 'drive channel 0'.

Additional Information

What is in an E-Series Support Bundle?
perf-stats-daily-summary-[a | b].csv    Performance stats for each controller throughout the day broken down into minute granularity
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