Test tape read speed

From: A Darren Dunham (ddunham@taos.com)
Date: Thu Sep 18 2008 - 19:23:36 EDT

  • Next message: Andre.Clark@earthlink.net: "Re: Test tape read speed"

    I'm trying to restore a file on a filer (via NetBackup) and the restore
    is *crawling* (a few KB/s on avg).

    One test I'd normally do would be to simply mount this tape up on the
    system and test that I could read it quickly. Is there any way to do
    this directly on the filer? I see 'dd', but I don't see how to read
    from the tape device.

    I don't think I can run a 'restore' because the data on the tape will be
    wrapped with NetBackup header information. I just want to test that the
    data can be read quickly. So actually interpreting the data isn't
    important at this point.

    Thanks.

    Background: Directly attached LTO3 drive. Backups are normally nice
    and speedy (50+ MB/s). ndmpd probe suggests that it's read 15GB of data
    in over 24 hours. *way* too slow. 

    -- 
Darren

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