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Question about tape performance history in Support ticket report

 
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Occasional Visitor

Question about tape performance history in Support ticket report

A client is claiming that they are only getting 10Gb of data per tape (Dat72).  I had them run the Storage Works tape tool and generate a support ticket. It's unclear to me what some of the data means. Any help would be appreciated. (full ticket is attached, details are below)

 

I'm trying to understand the "Estimated native data rate" section under Drive Performance/Drive section. 

 

If I read the following correctly, Tape "00022" had 19.1 GB written to it and tape "00018" had 35.3 GB written to it. Is that correct?

  

Their ticket includes the following:

Drive Performance
   Drive
    Specified max native data rate : 3 MB/sec
    Estimated native data rate(last 8 tapes) : 2.7 MB/sec
     Previous Tape(H-Z811-HU1094907X-4-00-00022 - DAT72): 2.7 MB/sec(19.1 GB written, 7.4 MB read)
     Previous Tape(H-Z811-HU1094907X-4-00-00019 - DAT72): 2.5 MB/sec(1.2 GB written, 2.4 MB read)
     Previous Tape(H-Z811-HU1094907X-4-00-00019 - DAT72): 0.7 MB/sec(40 MB written, 0 KB read)
     Previous Tape(H-Z811-HU1094907X-4-00-00021 - DAT72): 2.7 MB/sec(4 GB written, 1 MB read)
     Previous Tape(H-Z811-HU1094907X-4-00-00020 - DAT72): 2.2 MB/sec(1.4 GB written, 26.1 MB read)
     Previous Tape(H-Z811-HU1094907X-4-00-00019 - DAT72): 2.3 MB/sec(275 MB written, 1 MB read)
     Previous Tape(H-Z811-HU1094907X-4-00-00018 - DAT72): 2.8 MB/sec(35.3 GB written, 500 KB read)
     Previous Tape(H-Z811-HU1094907X-4-00-00017 - DAT72): 2.5 MB/sec(1.6 GB written, 500 KB read)
    Write Compression Ratio : 1.0:1 (last 34.8 GB)
    Read Compression Ratio : 1.0:1 (last 242 MB)

 

I'm also not sure how to interpret the error data. The "Read  Frame Error Counter" and "Write Frame Error Counter" has what appear to be large values, but I'm unsure.

 

Write Frame Error Counters
    Total Frames Written :785106
    Main Positive
     Error Count :1d0764
     Bit Error Rate :9.465462e-003
    Main Negative
     Error Count :c022f
     Bit Error Rate :3.915629e-003
    Overall
     Error Count :290993
     Bit Error Rate :3.915629e-003
   Read Frame Error Counters
    Total Frames Read :11554
    Total Retry Count :0
    Number of C2 Uncorrectables :0
    Main Positive
     Error Count :d26a
     Bit Error Rate :1.821136e-002
    Main Negative
     Error Count :27a3
     Bit Error Rate :3.430562e-003
    Overall
     Error Count :fa0d
     Bit Error Rate :3.430562e-003

 

1 REPLY 1
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Occasional Visitor

Re: Question about tape performance history in Support ticket report

Can someone comment on my question? I'm trying to understand the report generated by the tape utility.