Hello,
I'm having a problem with getting dm-rdac to work. I do realize that this
is a development list, but it seems like the only place to ask for help,
and http://christophe.varoqui.free.fr is down. In the logs i get the
following errors, after starting multipathd:
device-mapper: multipath rdac: using RDAC command with timeout 60000
device-mapper: table: 253:0: multipath: Unknown error
device-mapper: ioctl: error adding target to table
multipath -ll doesn't show anything.
The system is the following:
- centos 5.1, with kernel changed to vanilla 2.6.24.3
- tried both multipath-tools from centos (patched 0.4.7), and vanilla
0.4.8
- 2 qlogic QLA2340 hba's, connected to different fabrics
- 2 IBM DS4500 Storage Servers (each connected to both fabrics), each
exports two luns, one 1.5TB lun, and one 100MB lun. I've also tried using
one IBM DS4500 Storage Server with one 1.5TB lun, and one 100MB lun.
If i disable AVT (change the host type from Linux to LNXCLVMWARE) i also
get read errors from unavaliable paths:
end_request: I/O error, dev sda, sector 0
end_request: I/O error, dev sdd, sector 0
etc... (this is normal).
I can get multipath to work using the tur checker.
my /etc/multipath.conf is the following:
defaults {
multipath_tool "/sbin/multipath -v 0 -S"
udev_dir /dev
polling_interval 10
default_selector round-robin
default_selector_args 0
default_path_grouping_policy failover
default_getuid_callout "/sbin/scsi_id -g -u -s"
default_prio_callout "/bin/false"
user_friendly_names yes
}
devnode_blacklist {
devnode fd
devnode hd
devnode dm
devnode sr
devnode scd
devnode st
devnode ram
devnode raw
devnode loop
#root fs is on /dev/rd/c0d0
# devnode sda
# devnode sdb
}
devices {
device {
vendor IBM
product 1742-900
path_grouping_policy group_by_prio
hardware_handler "1 rdac"
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
failback immediate
path_checker rdac
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
}
}
multipaths {
multipath {
device {
vendor IBM
product 1742-900
}
}
}
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