Hello,
I have a system with Qlogic QLA2312 HBAs. System is running RHEL 4u4:
[root@cpn-0 etc]# uname -a
Linux cpn-0.chas1A.ucs2.net 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686 i686 i386 GNU/Linux
[root@cpn-0 etc]# rpm -qa | grep device
device-mapper-1.02.07-4.0.RHEL4
device-mapper-multipath-0.4.5-18.1.RHEL4
[root@cpn-0 etc]#
Storage is EMC Cx500. Multipath.conf is at the end of the mail. I have tested the system by running I/O directly to multipath device file, e.g. like this:
dd if=/dev/mpath/dm-0 of=/dev/null count=10000000
Now, when I pull the cable to cause path change, dd usually stops in the middle, and gives error message indicating I/O error. Any suggestions?
- Petteri Heinonen
[root@cpn-0 etc]# cat /etc/multipath.conf
defaults {
multipath_tool "/sbin/multipath -v0"
udev_dir /dev
polling_interval 10
}
devnode_blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z][[0-9]*]"
devnode "^cciss!c[0-9]d[0-9]*[p[0-9]*]"
}
multipaths {
multipath {
wwid 360060160df651000a83bbca2f1eeda11
alias global_data
path_grouping_policy failover
no_path_retry fail
path_selector "round-robin 0"
failback manual
}
multipath {
wwid 360060160df651000a2dac95713d1da11
alias global_sw
path_grouping_policy failover
no_path_retry fail
path_selector "round-robin 0"
failback manual
}
multipath {
wwid 360060160df651000a93bbca2f1eeda11
alias global_log
path_grouping_policy failover
no_path_retry fail
path_selector "round-robin 0"
failback manual
}
multipath {
wwid 360060160df651000445c248c15d1da11
alias global_backup
path_grouping_policy failover
no_path_retry fail
path_selector "round-robin 0"
failback manual
}
}
devices {
device {
vendor "DGC"
product "*"
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/sbin/mpath_prio_emc /dev/%n"
path_checker emc_clariion
hardware_handler "1 emc"
}
}
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