I always found the sleep values to be a trial and error thing.  Some lightly
loaded servers work fine with the defaults, other more heavily loaded
servers seem to need tweaking.  No guidance seems to be given from the
library/tape drive vendors or Legato (except when you call with mount type
problems).

For the cleaning sleep value; I've seen unload retrys while it is cleaning.
Would it be safe to say that one may be able to watch with a stop watch
a drive being cleaned, then set the sleep time to the total amount of time
it takes to clean on drive?   This would then guarrantee the software
doesn't unload it while its being cleaned.  As you said, the value could be
quite high.  Are the unload retries really hurting anything while it is
being cleaned?

Robert Maiello
Pioneer Data Systems


On Thu, 26 Aug 2004 11:53:07 -0400, Mark Dyer <mdyer AT OAOT DOT COM> wrote:

>George,
>
>I think I can help answer the function of the Sleep settings.  Simply put,
>it's the amount of time the Networker media management daemon (nsrmmd)
>waits after receiving a "Task complete" signal from the library before
>issuing the next command to the device.
>
>Example:
>The Eject sleep value is set to 5.
>
>One issues the command to unload a tape from a tape drive.
>
>nsrmmd first confirms the library is accepting commands, then issues the
>tape rewind command.
>Once the tape rewind command completes, nsrmmd will wait 5 seconds before
>issuing the tape eject command.
>
>I've seen problems with "read open" errors when our library was configured
>to perform automated drive cleanings.  I found that the Load sleep value
>within Legato was too long and the library had time to grab a cleaning
>cartridge & slap it into an empty drive right in the middle of Legato
>loading, unloading or labeling tapes.
>
>Similarly, when using Legato to manage device cleanings, I found the
>default Cleaning delay of 60 was too short.  It takes 5 minutes for my
>DLT7000 drives to perform a cleaning.
>
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