[dm-devel] dm-rdac problem

[Jacek Lipkowski]

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
                 }
         }
}