[dm-devel] path priorities on Sun's 6140
James Fillman
JFillman at cucbc.com
Mon Sep 17 18:36:32 UTC 2007
Ok. So I just realized that if I want to try the new RDAC support, then
I have to install the new beta kernel as well. It includes the RDAC
hardware handler.
I'm under serious pressure to get my cluster up and running asap and I
don't think I want to be installing a bunch of beta packages onto my
production servers. Especially kernels.
So this might mean not exploring the RDAC solution. Redhat's docs say
that they support a Sun OpenStorage D280 and our Sun rep says the 6140
is essentially identical. If that's the case, what am I don't wrong?
cheers,
--james
-----Original Message-----
From: dm-devel-bounces at redhat.com [mailto:dm-devel-bounces at redhat.com]
On Behalf Of James Fillman
Sent: Monday, September 17, 2007 11:18 AM
To: device-mapper development
Subject: RE: [dm-devel] path priorities on Sun's 6140
Thanks for getting back to me Tore, Hannes, and Eckebrecht.
I've downloaded and installed the latest device-mapper-multipath rpm
from Redhat. It's still only beta but I figured I give it a try. I see
that there's an rdac checker in there but I don't see a hardware
handler.
Is anyone running RHEL against a Sun 6140 SAN? Trying to get a
definitive answer from Redhat on their support for this SAN has been
impossible. The mailing list hasn't been too helpful either.
If RDAC is the way to go
1. do I need to use a hardware handler? There doesn't seem to be one
in their latest RPM.
2. What Host type do I chose on the SAN?
3. What should the path grouping policy by? Tore: you mentioned using
group_by_serial
4. What should the path checker be?
I'm going to take a stab at it and guess this, can anyone confirm?:
/etc/multipath.conf
defaults
{
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy group_by_serial
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
path_checker tur
rr_min_io 100
rr_weight uniform
failback immediate
no_path_retry queue
user_friendly_name yes
}
devices
{
device
{
vendor "SUN"
product "CSM200_R"
path_grouping_policy group_by_prio
path_checker tur
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
getuid_callout "/sbin/scsi_id -g -u -s
/block/%n"
rr_weight uniform
rr_min_io 1000
features "1 queue_if_no_path"
}
}
cheers,
--james
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