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To use multipathing in SnapDrive for UNIX, you must complete steps that include installing and starting the HBA. If you are using a non-NetApp multipathing solution, you must download the software and application package from the HBA vendor’s web site.
Your system must be running current versions of FC and iSCSI system components.
Install the supported HBAs before you install the appropriate Host Utilities software.
SnapDrive for UNIX supports multivendor HBAs.
Start the HBA service.
If the HBA service is not running, the following error message is displayed when you run SnapDrive for UNIX commands, such as
snapdrive storage createand
snapdrive config prepare luns:
0001-876 Admin error: HBA assistant not found
You must verify that the required number of paths are up and running. You can verify the paths by using the
sanlunutility, which is included with the Host Utilities software. For example, in the FC multipathing configuration, you can use the
sanlun fcp show adapter -vcommand.
In the following example, there are two HBA ports (fcd0 and fcd1) connected to the host that are operational (port state). You can have only one HBA or iSCSI initiator and you must configure multipathing by providing more than one path to the target LUNs.
# sanlun fcp show adapter -v adapter name: fcd0 WWPN: 50060b000038c428 WWNN: 50060b000038c429 driver name: fcd model: A6826A model description: Fibre Channel Mass Storage Adapter (PCI/PCI-X) serial number: Not Available hardware version: 3 driver version: @(#) libfcd.a HP Fibre Channel ISP 23xx & 24xx Driver B.11.23.04 /ux/core/isu/FCD/kern/src/common/wsio/fcd_init.c:Oct 18 2005,08:19:50 firmware version: 3.3.18 Number of ports: 1 of 2 port type: Fabric port state: Operational supported speed: 2 GBit/sec negotiated speed: 2 GBit/sec OS device name: /dev/fcd0 adapter name: fcd1 WWPN: 50060b000038c42a WWNN: 50060b000038c42b driver name: fcd model: A6826A model description: Fibre Channel Mass Storage Adapter (PCI/PCI-X) serial number: Not Available hardware version: 3 driver version: @(#) libfcd.a HP Fibre Channel ISP 23xx & 24xx Driver B.11.23.04 /ux/core/isu/FCD/kern/src/common/wsio/fcd_init.c:Oct 18 2005,08:19:50 firmware version: 3.3.18 Number of ports: 2 of 2 port type: Fabric port state: Operational supported speed: 2 GBit/sec negotiated speed: 2 GBit/sec OS device name: /dev/fcd1
If multipathing is enabled on a host, multiple paths are visible for the same LUN. You can use the
sanlun lun show allcommand to verify the paths. In the following example, you can find multiple paths to the same LUN (
[root@lnx221-75 ~]# sanlun lun show filer: lun-pathname device filename adapter protocol lun size lun state f960-221-167: /vol/vol1/lun1 /dev/sdd host5 FCP 100m (104857600) GOOD f960-221-167: /vol/vol1/lun1 /dev/sdc host6 FCP 100m (104857600) GOOD
If a third-party multipathing solution is supported by SnapDrive for UNIX or Host Utilities, download the HBA driver software package and application package from the HBA vendor’s web site.QLogic: For QLogic HBAs, go to http://support.qlogic.com/. From OEM models, select NetApp. Locate the driver version listed in the support Matrix and download it. Emulex: For Emulex HBAs, go to http://www.emulex.com/ts/index.html. From Downloads, select NetApp. Locate the driver version listed in the support Matrix and download it. Also download the Emulex applications package from the same location.
If you are using a QLogic adapter with FC connectivity, download the QLogic rescan script from the QLogic web site and copy it to the
/rootpath (for example,
/root/dynamic-lun-rescan.sh). The QLogic rescan script asks for user confirmation; SnapDrive for UNIX might hang indefinitely at this confirmation stage. You can avoid this confirmation by setting the variable
1in the script.
Earlier versions of SnapDrive for UNIX used vendor-specific SCSI rescan scripts to scan LUNs over FC, and thereby copying vendor-specific script to
/root/dynamic-lun-rescan.sh. This was made available until RHEL 5U3.
For RHEL 5U4/ SLES 10SP2 and later versions, the rescan script is currently available in the
/usr/bindirectory. In case the rescan script is not available in the directory, it is present along with the
You must ensure that the
sg3_utils-libslibraries are available for Red Hat Enterprise Linux (RHEL) and Oracle Enterprise Linux (OEL) versions. However, the
sg3_utilslibraries are available for SUSE Linux Enterprise Server (SLES) version in the
In an FC configuration, zone the host HBA ports and target ports by using the switch zoning configuration.
Install and set up the appropriate FC switch.
Check the SnapDrive for UNIX stack requirements.
Install or upgrade SnapDrive for UNIX.
Verify the SnapDrive for UNIX installation.
Configure the following configuration variables in the
For every host, the multipathing type, transport type, file system, and volume manager type are dependent on each other. The following table describes all the possible combinations:
Host platform Default transport type Multipathing type fstype vmtype
ext4 or ext3
ext4 or ext3
ext4 or ext3
ext4 or ext3
The preceding table gives the supported values of the
If the transport protocol is
iSCSI, and the multipathing type is set as
none, you should stop the multipath daemon and execute SnapDrive for UNIX commands.
SnapDrive for UNIX automatically checks this file each time it starts. You must restart the SnapDrive for UNIX daemon for the changes to take effect.