<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7651.59"> <TITLE>multipath errors on first set-up</TITLE> </HEAD> <BODY>  Hi, I am using multipath for the first time with little joy. 1. The requirement was to test SAN storage on a Redhat RHEL V4 Q2. I have a 1 TByte lun pointed at the server from the SAN. The are 4 QLOGIC HBAs attached. From /etc/sysconfig/hwconf: driver: qla2300 desc: "QLogic Corp. QLA2312 Fibre Channel Adapter" 2. After correcting the qlogic firmware setup (during server boot) and running ql-dynamic-tgt-lun-disc.sh ( utility from the QLOGIC website) I could see 4 new disk devices. sda - sdd. The ouput from ql-dynamic-tgt-lun-disc.sh looks like this: DEVICE [H:C:T:L] [0:0:0:0] [0:0:0:1] [1:0:0:0] [1:0:0:1] [2:0:0:0] [2:0:0:1] [3:0:0:0] [3:0:0:1] 3. I installed the following rpms for multipath support ( from the Redhat site). rpm -ivh sysfsutils-1.2.0-1.i386.rpm - pre-req device-mapper-multipath-0.4.5-6.0.RHEL4.i386.rpm 4.Starting the multipathd daemon at first did nothing. I then did some google'ing and did the following: modprobe dm-multipath modprobe dm-round-robin based on some other documents I made the following changes to /etc/multipath.conf # Blacklist all devices by default. Remove this to enable multipathing # on the default devices. #devnode_blacklist { # devnode "*" #} above paragraph commented out ## ## This is a template multipath-tools configuration file ## Uncomment the lines relevent to your environment ## defaults { multipath_tool "/sbin/multipath -v0" udev_dir /dev polling_interval 10 default_selector "round-robin 0" default_path_grouping_policy multibus default_getuid_callout "/sbin/scsi_id -g -u -s /block/%n" default_prio_callout "/bin/true" default_features "0" rr_wmin_io 100 failback immediate } Removed comments from above default stanza device { vendor "COMPAQ " product "MSA1000 VOLUME " path_grouping_policy multibus path_checker tur } Removed comments from above device stanza for MSA1000 VOLUME The rest of the config file is all commented out. I ran multipath –v3 to recreate I get the following: [root@brli036a mapper]# multipath -v3 cciss!c0d0 blacklisted deleted rest of blacklist output path sda not found in pathvec ===== path sda ===== bus = 1 dev_t = 8:0 size = 3906810493 vendor = HP product = MSA VOLUME rev = 6.86 h:b:t:l = 0:0:0:1 tgt_node_name = 0x500508b300930230 serial = PB9840PX3TF0C0 path checker = readsector0 (internal default) state = 2 getprio = /bin/true (internal default) prio = 0 getuid = /sbin/scsi_id -g -u -s /block/%n (internal default) uid = 3600508b300930230a7495ae1b9500074 (callout) path sdb not found in pathvec ===== path sdb ===== bus = 1 dev_t = 8:16 size = 3906810493 vendor = HP product = MSA VOLUME rev = 6.86 h:b:t:l = 1:0:0:1 tgt_node_name = 0x500508b300930230 serial = PB9840PX3TJ0FU path checker = readsector0 (internal default) state = 2 getprio = /bin/true (internal default) prio = 0 getuid = /sbin/scsi_id -g -u -s /block/%n (internal default) uid = 3600508b300930230a7495ae1b9500074 (callout) path sdc not found in pathvec ===== path sdc ===== bus = 1 dev_t = 8:32 size = 3906810493 vendor = HP product = MSA VOLUME rev = 6.86 h:b:t:l = 2:0:0:1 tgt_node_name = 0x500508b300930230 serial = PB9840PX3TF0C0 path checker = readsector0 (internal default) state = 2 getprio = /bin/true (internal default) prio = 0 getuid = /sbin/scsi_id -g -u -s /block/%n (internal default) uid = 3600508b300930230a7495ae1b9500074 (callout) path sdd not found in pathvec ===== path sdd ===== bus = 1 dev_t = 8:48 size = 3906810493 vendor = HP product = MSA VOLUME rev = 6.86 h:b:t:l = 3:0:0:1 tgt_node_name = 0x500508b300930230 serial = PB9840PX3TJ0FU path checker = readsector0 (internal default) state = 2 getprio = /bin/true (internal default) prio = 0 getuid = /sbin/scsi_id -g -u -s /block/%n (internal default) uid = 3600508b300930230a7495ae1b9500074 (callout) # # all paths : # 3600508b300930230a7495ae1b9500074 0:0:0:1 sda 8:0 [MSA VOLUME ] 3600508b300930230a7495ae1b9500074 1:0:0:1 sdb 8:16 [MSA VOLUME ] 3600508b300930230a7495ae1b9500074 2:0:0:1 sdc 8:32 [MSA VOLUME ] 3600508b300930230a7495ae1b9500074 3:0:0:1 sdd 8:48 [MSA VOLUME ] pgpolicy = multibus (config file default) selector = round-robin 0 (internal default) features = 0 (internal default) hwhandler = 0 (internal default) 0 3906810493 multipath 0 0 1 1 round-robin 0 4 1 8:0 1000 8:16 1000 8:32 1000 8:48 1000 action preset to 0 action set to 4 create: 3600508b300930230a7495ae1b9500074 [size=1 TB][features="0"][hwhandler="0"] \_ round-robin 0 \_ 0:0:0:1 sda 8:0 \_ 1:0:0:1 sdb 8:16 \_ 2:0:0:1 sdc 8:32 \_ 3:0:0:1 sdd 8:48 device-mapper ioctl cmd 14 failed: Invalid argument message 3600508b300930230a7495ae1b9500074 0 switch_group 1 failed Note sure if "path sdX not found in pathvec" relevant anyway no mpaths have been created. I hope there is someone out there who can give me some help with this. with regards, Julian Rogan </BODY> </HTML>