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no_hope
Guru
Joined: 23 Jun 2003
Posts: 482
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 Posted: Sun Aug 10, 2008 6:32 pm Post subject: dstat reporting twice the actual disk activity? |
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I noticed that dstat in the dsk/total column seems to report twice the amount of data transferred to and from disk.
For example, if I am transferring a file over 100Mbps network, scp will report about 10MB/s, dstat's network "send" column will report about 10MB/s, but the disk read column is reporting over 20MB/s. Similar things happens when I move data between drives. pv would report X MB/s and dstat will report 2X for both reads and writes. Copying to /dev/null is also reported to be at twice the rate it should be.
Am I missing something? |
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Janne Pikkarainen
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Joined: 29 Jul 2003
Posts: 1143
Location: Helsinki, Finland
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| Posted: Sun Aug 10, 2008 6:39 pm Post subject: Re: dstat reporting twice the actual disk activity? |
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| no_hope wrote: | I noticed that dstat in the dsk/total column seems to report twice the amount of data transferred to and from disk.
For example, if I am transferring a file over 100Mbps network, scp will report about 10MB/s, dstat's network "send" column will report about 10MB/s, but the disk read column is reporting over 20MB/s. Similar things happens when I move data between drives. pv would report X MB/s and dstat will report 2X for both reads and writes. Copying to /dev/null is also reported to be at twice the rate it should be.
Am I missing something? |
I guess dstat reports the disk throughput in blocks per second, and as one block = 512 bytes, the reported transfer speed seems to be twice the rate it should be.
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