From: John Feeney <jfeeney@redhat.com>
Date: Thu, 23 Apr 2009 13:58:20 -0400
Subject: [scsi] add md3000 and md3000i entries to rdac_dev_list
Message-id: 49F0AC3C.30203@redhat.com
O-Subject: [RHEL5.4 PATCH] add md3000 and md3000i entries to rdac_dev_list
Bugzilla: 487293
RH-Acked-by: David Milburn <dmilburn@redhat.com>
RH-Acked-by: Mike Christie <mchristi@redhat.com>

bz487293
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=487293
Missing DELL MD3000i storage into scsi_dh_rdac kernel module
  device list

Description of problem:
Neither the Dell PowerVault MD3000 or MD3000i are supported by RHEL-5.
When these devices are used, the following is displayed in the logs:
  device-mapper: multipath: Cannot failover device because scsi_dh_rdac
was not loaded.
  kernel: device-mapper: multipath: Failing path 8:16.
  kernel: device-mapper: multipath: Could not failover device. Error 15.

Note: The Dell TAM is aware of a number of customers affected by this
problem.

Solution:
Add MD3000 and MD3000i entries to the rdac_dev_list array.

Upstream status:
The upstream commit is:
650849d71ca05d55a1553fe42fb21af9dce5612b
by Yanqing Liu <yanqing_liu@dell.com>

scsi_dh: add Dell product information into rdac device handler
  [SCSI] scsi_dh: add Dell product information into rdac device handler
  Add Dell Powervault storage arrays into device list of rdac device
   handler.

Brew:
Successfully built in Brew (task_1773119)

Testing:
Vinnie Valdez, the Red Hat engineer who works on HA clusters as part of
ClusterSuite/GFS at the Dell Austin facility, successfully tested this
patch.

With the patch, the following log message was found in lieu of the error
message:
device-mapper: multipath: Using scsi_dh module scsi_dh_rdac for
failover/failback and device management.
 multipathd: mpath1: load table [0 104857600 multipath 0 1 rdac 2 1
round-robin 0 1 1 8:16 1000 round-robin 0 1 1 8:32 1000]

Acks would be appreciated. Thanks.

diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 3cdd97a..7fa7f51 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -595,6 +595,8 @@ const struct scsi_dh_devlist rdac_dev_list[] = {
 	{"STK", "OPENstorage D280"},
 	{"SUN", "CSM200_R"},
 	{"SUN", "LCSM100_F"},
+	{"DELL", "MD3000"},
+	{"DELL", "MD3000i"},
 	{NULL, NULL},
 };