Ibm aix multipath configuration – HP MPX200 Multifunction Router User Manual

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Table 15 Configuring Hitachi Dynamic Link Manager on Linux (continued)

Install HDLM software as recommended by the vendor.

Pre-migration setup

To check the multipath status of the disks, issue the dlnkmgr view -path command.

Multipath installation
verification

Validations during router insertion process

The path status for the path belonging to the zoned-out controller port (for example,
Port A) is shown as “failed” in the HDLM on the host.

Removing first direct path
from controller port (for
example, Port A)

The host initiator port is seen as online and logged in on the router CLI and HP mpx
Manager. The newly added path appears online and active on the host in HDLM.

Adding router path for the
removed controller port (for
example, Port A)

Depending upon the policy settings, part of the host I/O may start flowing through the
path presented by the router.

To verify, run the show perf byte command on the router to view the traffic
flowing through the router ports.

To rescan the new path through the router, issue the following command:

# echo "- - -" > /sys/class/scsi_host/host2/scan;

Issue the following HDLM-related commands:

dlmcfgmgr -r

dlmcfgmgr -v

dlnkmgr view -path

The path status for the path belonging to the zoned-out controller port (for example,
Port B) is shown as online and offline in the dlnkmgr view -path command output
on the host. The entire host I/O now must flow through the router.

Removing second direct path
from controller port (for
example, Port B)

To verify, issue the show perf byte command.

The host initiator port is seen as online and logged in on the router CLI and HP
StorageWorks mpx Manager. The newly added path appears on the host in the

Adding router path for the
removed controller port (for
example, Port B)

dlmcfgmgr -v

output. Depending on the policy settings, part of the host I/O may

start flowing the new path presented by the router. To rescan the new path, issue the

dlmcfgmgr -r

command.

These validations use the method described in

“Zoning in presented targets: Method 1”

Alternatively, you can use the method described in

“Zoning in presented targets: Method 2”

IBM AIX Multipath Configuration

Table 16 Configuring EMC PowerPath on IBM AIX

IBM AIX 5.3 and 6.1

EMC PowerPath (only PowerPath multipath software is qualified with AIX 5.3 and 6.1
for router insertion).

Multipathing software

Pre-migration setup

Verify that the LUN is not accessible to any other host except the source host: the
LUN must have no zoning for new storage.

Ensure that the AIX host reserve policy settings are set correctly to no_reserve.

Disable the reserve_lock for AIX hosts as follows:
a. Check the disk attribute to see if any lock is enabled. To check the lock status for

a specific disk (for example, hdiskpower10), issue the following command:

# lsattr -El hdiskpower10 |grep reserve
//check the reserve_lock inforeserve_lock yes
Reserve device on open True

b. If any application (for example, Oracle database) is running on the disk or LUN,

stop the application.

c. Unmount the file system as follows:

# umount /u01

IBM AIX Multipath Configuration

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