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Re: [dm-devel] info on enabling only one path with rdac and DS4700

On Mon, Nov 28, 2011 at 9:13 PM, Gianluca Cecchi wrote:
> On Mon, Nov 28, 2011 at 7:05 PM, Moger, Babu wrote:
>> RHEL 5.7 has the patch already as I know. You can check to be sure. Can you also add "scsi_mod.scsi_logging_level=5056" in kernel line to get more information on what else is going on.
> Ok, I have verified that the patch should be applied.
> So I'm going to add the scsi logging parameter you suggested and see.

Unfortunately it seems that rh el 5.x kernel doesn't support that
scsi_mod kernel module option directly at kernel line
# cat /proc/cmdline
ro root=/dev/VolGroup00/LV_root rhgb quiet scsi_mod.scsi_logging_level=5056

In messages:
Nov 29 07:00:03 testserver kernel: Unknown boot option
`scsi_mod.scsi_logging_level=5056': ignoring

So I picked up the new initrd with the scsi_dh part and put directly
that option at insmod statement line for scsi_mod module in initrd
init file, creating another special grub.conf stanza for this initrd
See messages and output of dmesg with this parameter at the links below


At the end of boot:
mpath1 (3600a0b80005012440000093e4a55cf33) dm-6 IBM,1814      FAStT
[size=3.4T][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=0][active]
 \_ 3:0:1:1 sdc 8:32  [active][undef]
 \_ 4:0:1:1 sde 8:64  [active][undef]
\_ round-robin 0 [prio=0][enabled]
 \_ 3:0:0:1 sdb 8:16  [active][undef]
 \_ 4:0:0:1 sdd 8:48  [active][undef]

Hope it helps you understanding better what doesn't go as expected..
Thanks for your time


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