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  • 1.  HBA buffer settings.

    Posted Mon September 12, 2011 08:50 AM

    Originally posted by: Jagdish Mane


    Hi,
    I am trying to find out the command that can list me the HBA and disk buffer settings on AIX and solaris Hosts.
    what do the "queue_depth" and "man_transfer" represent ?
    THanks


  • 2.  Re: HBA buffer settings.

    Posted Thu September 15, 2011 03:52 AM

    Originally posted by: SystemAdmin


    for aix
    lsattr -El hdiskn will show queue_depth and max_transfer
    lsattr -El fcs0 will show num_cmd_elems and max_xfer_size

    queue_depth is the number of IOS that can be passed to disk in parallel.
    queue can be checked whith command iostat -DRTl (look for serv qfull)

    The maximum transfer size (max_transfer) sets the limit for the maximum size of an individual I/O to the disk. Although applications might make larger I/O requests, those requests are broken down into multiple max_transfer-sized requests before they are handed to the disk driver.

    http://www.redbooks.ibm.com/abstracts/SG247821.html (chapter 3.4)


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