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Re: [linux-lvm] How to associate two paths for each EMC device?



I remove the driver,reloaded manaully like this:

insmod qla2300 ql2xfailover=1 ql2xmaxqdepth=64

I still have 44 luns (each disk presents twice on the system).

this is my qla driver
-------------------------------------
QLogic PCI to Fibre Channel Host Adapter for QLA2340:
        Firmware version:  3.02.13, Driver version 6.06.00-fo
Entry address = a000000000793770
HBA: QLA2312 , Serial# L08747
Request Queue = 0x1af3c000, Response Queue = 0x1ac50000
Request Queue count= 128, Response Queue count= 512
Total number of active commands = 0
Total number of interrupts = 257
Total number of IOCBs (used/max) = (0/600)
Total number of queued commands = 0
    Device queue depth = 0x40
Number of free request entries = 121
Number of mailbox timeouts = 0
Number of ISP aborts = 0
Number of loop resyncs = 0
Number of retries for empty slots = 0
Number of reqs in pending_q= 0, retry_q= 0, done_q= 0, scsi_retry_q= 0
Number of reqs in failover_q= 0
Host adapter:loop state= <READY>, flags= 0xc008e0833
Dpc flags = 0x40
MBX flags = 0x0
SRB Free Count = 4096
Link down Timeout = 000
Port down retry = 045
Login retry count = 045
Commands retried with dropped frame(s) = 0


SCSI Device Information:
scsi-qla0-adapter-node=200000e08b100beb;
scsi-qla0-adapter-port=210000e08b100beb;
scsi-qla0-port-0=50060482c4648c2c:50060482c4648c2c;

SCSI LUN Information:
(Id:Lun)  * - indicates lun is not registered with the OS.
( 0: 0): Total reqs 13, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 1): Total reqs 12, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 2): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 3): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 4): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 5): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 6): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 7): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 8): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0: 9): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:10): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:11): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:12): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:13): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:14): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:15): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:16): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:17): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:18): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:19): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:20): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:21): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,
( 0:22): Total reqs 11, Pending reqs 0, flags 0x0, 0:0:81,


Regards,
Shan Jing

Unix Group - Americas
Deutsche Bank
2 Gatehall Drive, 3rd Floor
Parsippany, New Jersey, USA
shan jing db com
973.682.3463




                                                                                                                                       
                      Theo Van Dinter                                                                                                  
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                      et>                      cc:                                                                                     
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                      03/19/2004 12:44                                                                                                 
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                      Please respond to                                                                                                
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On Fri, Mar 19, 2004 at 12:21:51PM -0500, Shan Jing wrote:
> I have 22  EMC symmetrix disks on two HBA links.  At this moment, there is no working copy of EMC powerpath or HP Securepath available for my kernel (2.4.21-112-itanium2-smp); therefore, I have to use the luns directly with lvm without any DMP software in the middle.
>
> Without DMP software, there are two set of 22 luns, each representing one HBA path.  See blow.

Can you set your HBA driver to do failover?   ie: something like this
in modules.conf:

options qla2300 ql2xfailover=1 ql2xmaxqdepth=64


This works well for my servers connected to a CX-series array. :)   The
driver handles failing between HBAs (active-passive), and only has the
LUN presented once to the system.

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The following file(s) have been deleted by: Shan Jing on 3/19/2004 1:45:07 PM

C.DTF
atthx9wo.dat





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