megaraid_sas waiting for command and then offline

Joe Malicki jmalicki at
Tue Dec 12 12:40:28 CST 2006

Thanks Greg,

Is there documentation or tests of the number of commands per LUN that
the hardware can handle?  The driver is clearly reading the value out of
a register on the card.


Greg Dickie wrote:
> We've never had lockups like this but we did notice that the
> megaraid_sas modules defaults to a much higher commands per lun setting
> than the hardware seems to be able to handle. IIRC the default is 128
> and we lowered it to 16 for the 5i and 32 for the 5E.
> HTH,
> Greg

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