Hi Brad,
Since you use Device Mapper, I am forwarding your message to
dm-devel@xxxxxxxxxx list. Developers on dm-devel should be able to help
you.
--
Mike Tran
-------- Forwarded Message --------
From: Brad Dameron <brad@xxxxxxxxxx>
To: linux-raid@xxxxxxxxxxxxxxx
Subject: Multipath Tools.
Date: Tue, 27 Sep 2005 14:40:11 -0700
Trying to get multipath round-robin working on a dual-port Qlogic 2300
fiber card with both path's connected to a Sun A5200. I can see the
drives twice from the OS. So I know both path's are fine. I can then
partition the drives.
I am running on SuSe 9.3 which has this version of multipath tools:
multipath-tools-0.2.1-3
I did the following to run a quick test:
echo "0 35563590 multipath 2 round-robin 1 0 8:16 round-robin 1 0 8:192"
| dmsetup create dm-0
echo "0 35563590 multipath 2 round-robin 1 0 8:32 round-robin 1 0 8:208"
| dmsetup create dm-1
linux:~ # ls -l /dev/dm-*
lrwxrwxrwx 1 root root 11 Sep 27 01:35 /dev/dm-0 -> mapper/dm-0
lrwxrwxrwx 1 root root 11 Sep 27 01:36 /dev/dm-1 -> mapper/dm-1
linux:~ # ls -l /dev/mapper/
drwxr-xr-x 2 root root 144 Sep 27 01:42 .
drwxr-xr-x 36 root root 182216 Sep 27 01:47 ..
lrwxrwxrwx 1 root root 16 Sep 26 18:42 control -> ../device-mapper
brw------- 1 root root 253, 0 Sep 27 01:35 dm-0
brw------- 1 root root 253, 1 Sep 27 01:36 dm-1
Here is my multipath.conf:
defaults {
multipath_tool "/sbin/multipath -v 0 -S"
udev_dir /dev
polling_interval 10
default_selector "round-robin 1"
default_path_grouping_policy multibus
default_getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
default_prio_callout "/bin/false"
r_min_io 100
}
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 320000004cf278d89
alias multipath1
path_grouping_policy multibus
path_selector "round-robin 1"
}
multipath {
wwid 320000004cf8f2eda
alias multipath2
}
}
devices {
device {
vendor "SEAGATE "
product "ST336605FSUN36G"
path_grouping_policy group_by_serial
path_checker tur
}
}
Then I do a "multipath -v 2" and get:
# all paths :
# all multipaths :
# device maps :
Once I get this working my plan is to software RAID10 them together.
Anyone done something like this before?
Any help to get this going appreciated.
Thank you,
Brad Dameron
SeaTab Software
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