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OEL Pages From Docu5128_Host Connectivity Guide for LinuxVersionA35
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  262  EMC Host Connectivity Guide for Linux  Native Multipath Failover 5. If the listing is appropriate, commit the configuration as follows.a. Start the required multipath processes. #  /etc/init.d/boot.multipath start #  /etc/init.d/multipathd start  b. Perform an  lsmod  and verify that the processes are running. #  lsmod |grep dm  6. To get a listing of the current setup, type: #  multipath -ll 7. Integrate the startup of the appropriate daemons in the bootsequence as follows: # insserv boot.device-mapper multipathd boot.multipath You may optionally reboot the host to verify that the requiredprocesses automatically startup. Note: Additional documentation is available in the directory/usr/share/doc/packages/multipath-tools/ x.x.x /. Oracle Linux andVirtual Server The section discusses methods for configuring EMC VNX series andCLARiiON storage arrays. ◆  “PNR” on page 262 ◆  “ALUA” on page 262 PNR  All the Oracle Linux and virtual server versions use the sameconfigurations as Red Hat Enterprise Linux for VNX series andCLARiiONarraystoragesystemsbecausetheysharethesamekernel.For more information, refer to “Red Hat Enterprise Linux (RHEL),”“PNR” on page 234. ALUA  Limitations ofALUA devices in EMC VNX series and CLARiiONstorage systems: ◆  Currently EMC does not support having PNR andALUA devicesattached to the same host. ◆  Currently, boot from SAN is not supported withALUA devices.  MPIO configuration forVNX Unified Storage and CLARiiON   263Native Multipath Failover All Oracle Linux versions with either the Oracle enhanced Red Hatkernel or the stock Red Hat kernel follow the same configurationrules as the corresponding RHEL version until OEL 5.6, when Oracleadded the new UEK Kernel. This section will detail theALUAsetting for OL 5.6 and greater, and OL 6.0 and greater.The following steps detail the procedure for configuring nativemultipathfailoveronOL5.6andlaterandOL6.0andlaterhostswiththe Oracle UEK kernel.The /etc/multipath.conf file is installed by default when you installthe device-mapper-multipath package.To configure MPIO, complete the following steps:1. Replace the default /etc/multipath.conf with the followingmultipath.conf file recommended by EMC for attach to EMCstorage.To find a copy of a the file on a OL system to use, issue thefollowing command: #  rpm -ql `rpm -qa | grep multipath` | grep synt The following is sample output from OL: /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf.synthetic IMPORTANTThe following isan example of edited files thatwould supporta VNX series or CLARiiON in ALUA mode. Consult OracleLinux documentation to ensure the correct syntax is followedOL. ã Setting multipath.conf on OL 5.6 withALUA devices: #### This is a template multipath-tools configuration file## Uncomment the lines relevant to your environment## This is the multipath.conf needed to be changed for which works for OEL 5.6##defaults {# uDev_dir /dev# polling_interval 10# path_selector round-robin 0 # path_grouping_policy multibus# getuid_callout /lib/uDev/scsi_id --whitelisted --device=/dev/%n # prio const# path_checker directio  264  EMC Host Connectivity Guide for Linux  Native Multipath Failover # rr_min_io 100# flush_on_last_del no# max_fds 8192# rr_weight priorities# failback immediate# no_path_retry fail#queue_without_daemon nouser_friendly_names yes# mode 644# uid 0# gid disk}#Blacklist {devnode ^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]* devnode ^hd[a-z][[0-9]*] # device {# vendor DEC.*# product MSA[15]00# }#}#blacklist_exceptions {# devnode ^dasd[c-d]+[0-9]* # wwid IBM.75000000092461.4d00.34 #}#multipaths {# multipath {# wwid 3600508b4000156d700012000000b0000# alias yellow# path_grouping_policy multibus# path_selector round-robin 0 # failback manual# rr_weight priorities# no_path_retry 5# rr_min_io 100# }# multipath {# wwid 1DEC_____321816758474# alias red# }#}#devices {# device {# vendor COMPAQ # product HSV110 (C)COMPAQ # path_grouping_policy multibus# getuid_callout /lib/uDev/scsi_id --whitelisted --device=/dev/%n # path_checker directio# path_selector round-robin 0 # hardware_handler 0 # failback 15# rr_weight priorities# no_path_retry queue  MPIO configuration forVNX Unified Storage and CLARiiON   265Native Multipath Failover # rr_min_io 100# product_blacklist LUNZ# }# device {# vendor COMPAQ # product MSA1000 # path_grouping_policy multibus# }#}devices {# Device attributed for EMC CLARiiON arrays and VNX storage systems ALUAdevice {vendor DGC product * product_blacklist LUNZ path_grouping_policy group_by_priogetuid_callout /lib/udev/scsi_id -g -u -s /block/%n path_checker emc_clariionpath_selector round-robin 0 features 1 queue_if_no_path prio aluahardware_handler 1 alua no_path_retry 60failback immediaterr_weight uniform rr_min_io 1000}} ã Setting multipath.conf on OL 6.0 withALUA devices: #### This is a template multipath-tools configuration file## Uncomment the lines relevant to your environment## This is the multipath.conf needed to be changed for which works for OEL 6.0##defaults {# uDev_dir /dev# polling_interval 10# path_selector round-robin 0 # path_grouping_policy multibus# getuid_callout /lib/uDev/scsi_id --whitelisted --device=/dev/%n # prio const# path_checker directio# rr_min_io 100# flush_on_last_del no# max_fds 8192# rr_weight priorities# failback immediate# no_path_retry fail#queue_without_daemon nouser_friendly_names yes
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