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While the transfers were running the network IO and (for some time) the disk IO on the two HPSS movers were recorded.
The HPSS instance has two disk arrays that are accessed by both movers and show up as devices sdc and sdd.
The disk IO was not monitored during the first 7:30 hours therefore no data are shown for this time in the disk IO plots.
Reading files from HPSS
Reading a single file, tape needs to be mounted
Single files were read from HPSS. The next table shows the time it took to transfer a file from HPSS to a server.
To transfers were done. For the first one the tape was not mounted so this transfer includes the overhead due to
mounting and positioning the tape. For the second transfer the file was already in the HPSS disk cache.
| first access | second access | delta | ||
|---|---|---|---|---|---|
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="3a17c204-5025-4bc6-9109-217517ea224d"><ac:plain-text-body><![CDATA[ | file size | elapsed [s] | elapsed [s] | [s] | ]]></ac:plain-text-body></ac:structured-macro> |
31680 | 115 | 2 | 113 | ||
555840 | 107 | 2 | 105 | ||
1167944991 | 122 | 13 | 109 | ||
28304089310 | 600 | 307 | 293 | ||
23764091017 | 488 |
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