RE: scsi bus-reset in qlogic causes system stall

[devnetfs <devnetfs@yahoo.com>]

Thanks Ravi and Steven for the information.
I will try the new driver you pointed out and update back.

I had couple of questions though:

1. What do you mean by "issued thru the backdoor"? I am using the
standard(?) SG_SCSI_RESET ioctl. Is there any other way of doing it?

2. Can this "Waiting for FC LIP..." be disabled (still bus resets 
work)? [sorry I am a newbie in the fiberchannel/scsi world]. The reason
I am asking this is, while doing a BUS RESET from a node all other
nodes also *wait* for FC LIP to complete -- and that makes all
the nodes on the shared scsi vulnerable to this hang/stall thing.

The way I've connected shared scsi is: Multiple nodes (each having one
qlogic 2200 FC HBA) connect to a SAN switch(brocade) to which a JBOD is
also connected.

Thanks once again,
A.

--- Ravi Anand <ravi.anand@qlogic.com> wrote:
> Please use the following link to download the latest
> driver-v6.04.00b8
> 
> http://www.qlogic.com/support/os_detail.asp?productid=125&osid=26
> 
> There has been some other fixes too in the bus reset code when issued
> through the backdoor.
> 
> Regards
> Ravi
> 
> -----Original Message-----
> From: Steven Dake [mailto:sdake@mvista.com]
> Sent: Friday, January 17, 2003 10:33 AM
> To: devnetfs
> Cc: linux-scsi@vger.kernel.org
> Subject: Re: scsi bus-reset in qlogic causes system stall
> 
> 
> bug in qlogic driver I think this has been fixed to a
> schedule_timeout 
> in the 6.X drivers (from a spin on i/o)
> 
> I have done this same thing with the 6.x driver and the system is
> still 
> usable.  Keep in mind that the I/O's will retry until the FC LIP has 
> completed.
> 
> Thanks
> -steve
> 
> devnetfs wrote:
> 
> >Hello,
> >
> >I am running RedHat 2.4.9-13 with qlogic qla2x00 driver (ver
> 4.31.7b).
> >Trying to do a bus-reset (in an multi-initiator, shared-scsi
> scenario)
> >stalls one (or more) nodes in the system for a while. dmesg shows
> the
> >message: "Waiting for LIP to complete...", on all nodes. Everything
> >freezes for a while (around 10-40secs). It happens on UP/SMP both.
> >
> >Is this normal? or a bug in qlogic driver? 
> >
> >Thanks in advance for any insight,
> >A.
> >
> >
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