HP MPX200 Multifunction Router - Manual (Page 154)

Table 13 Configuring native device Mapper-Multipath on Linux (continued)
The path status for the path belonging to the zoned-out controller port (for example,
Port B) is shown as failed or faulty in the multipath -ll output on the host. The Removing second direct path
from controller port (for
example, Port B)
entire host I/O now must flow through the router. Verify that the show perf byte
command shows the I/O flowing through the router.
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 active and ready on the Adding router path for the
removed controller port (for
example, Port B)
host in the multipath-ll output. Depending upon the policy settings, part of the host
I/O may start flowing the new path presented by the router.
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” .
For HP EVA devices, modify the /etc/multipath.conf entries as follows:
device {
vendor "HP|COMPAQ"
product "HSV1[01]1 \(C\)COMPAQ|HSV[2][01]0|HSV300|HSV4[05]0"
path_grouping_policy group_by_prio
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker tur
path_selector "round-robin 0"
prio alua
rr_weight uniform
failback immediate
hardware_handler "0"
no_path_retry 12
rr_min_io 100
}
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” .
Table 14 Configuring EMC PowerPath on Linux
Linux: RHEL 4 and 5, SLES 10 and 11 OS
EMC PowerPath Multipathing software
Install PowerPath software as recommended by the vendor. Pre-migration setup
Issue the powermt display dev=all command and verify the PowerPath multipath
disk and available paths. Multipath installation
verification
Validations during router insertion process
The powermt display dev=all command displays the path state as “dead.” The
other active and alive path continues the I/O. Removing first direct path
from controller port (for
example, Port A)
Perform a rescan on the Linux host to identify the new paths. The Fdisk -l command
displays the LUN through the newly added path. The powermt display dev=all
command lists the additional router path to the same LUN along with the direct path. Adding router path for the
removed controller port (for
example, Port A)
The powermt display dev=all command displays the path state as dead. The
other active and alive router path continues the I/O. Removing second direct path
from controller port (for
example, Port B)
Adding router path for the
removed controller port (for
example, Port B) 1. Perform a rescan on the Linux host to identify the new paths.
2. Issue the Fdisk -l command to list the LUN through the newly added path.
3. Issue the powermt display dev=all command to list the additional path to the
same LUN along with first router path.
Table 15 Configuring Hitachi Dynamic Link Manager on Linux
Linux: RHEL 4 and 5, SLES 10 and 11 OS
HDLM Multipathing software
154 Configuring the data path through MPX200 for online data migration