Problem with mpt(4) and Infortrend RAID

[Xin LI]

Would you please try:
camcontrol tags da1

To see how many tags are actually allowed for the device, at the host
side?  It comes to my mind that:

在 2005-02-19六的 17:23 +0800，Rong-En Fan写道：
>  Maximum Queued I/O Count -  256                                
>  LUNs per Host SCSI ID - 8                                      
>  Max Number of Concurrent Host-LUN Connection - Def(4)          
>  Number of Tags Reserved for each Host-LUN Connection - Def(32) 

Here:  You have allowed only 32, and if the host has exceeded the
limitation, then something strange *may* happen.  My bet is to decrease
the tags allowed at host side, to something like 32:

camcontrol tags da1 -N 32.

It's also possible to modify cam_xpt.c to set the default number.

> I'm not that similar with SCSI, if it possible some parameters
> here need to tune?

If you have a spare box, try to decrease the tag depth :-)  Please be
sure to decrease tag depth on every device.

Cheers,
-- 
Xin LI <delphij delphij net>  http://www.delphij.net/
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