Hello,
we face problems setting up a linux RedHat entreprise 4
(RHEL4) server for SAN. The fibre-channel adapter are 2x
QLogic ISP2422, using the qal2400 linux driver.
The SAN array is a SUN T4.
The server is a SUN AMD EM64 box, hence we are using
the EM64 RedHat distro. Kernel is kernel-smp-2.6.9-42.EL.
we use multipath-tools to do failover between two paths
to the SAN array, redhat package name is
device-mapper-multipath-0.4.5-16.1.RHEL4
The problem is that one of the two paths continously
goes down and up, as detected by multipathd readsector0
or tur probe.
a "grep multipathd" of /var/log/messages:
Sep 28 17:52:48 alambix multipathd: 8:96: mark as failed
Sep 28 17:52:48 alambix multipathd: mpath2: remaining active paths: 1
Sep 28 17:52:52 alambix multipathd: 8:96: readsector0 checker reports
path is up
Sep 28 17:53:03 alambix multipathd: 8:96: reinstated
Sep 28 17:53:03 alambix multipathd: mpath2: remaining active paths: 2
Sep 28 17:53:03 alambix multipathd: 8:96: mark as failed
Sep 28 17:53:03 alambix multipathd: mpath2: remaining active paths: 1
Sep 28 17:53:07 alambix multipathd: 8:96: readsector0 checker reports
path is up
Sep 28 17:53:07 alambix multipathd: 8:96: reinstated
Sep 28 17:53:07 alambix multipathd: mpath2: remaining active paths: 2
Sep 28 17:53:08 alambix multipathd: 8:96: mark as failed
Sep 28 17:53:08 alambix multipathd: mpath2: remaining active paths: 1
Sep 28 17:53:12 alambix multipathd: 8:96: readsector0 checker reports
path is up
Sep 28 17:53:12 alambix multipathd: 8:96: reinstated
Sep 28 17:53:12 alambix multipathd: mpath2: remaining active paths: 2
Sep 28 17:53:28 alambix multipathd: 8:96: mark as failed
Sep 28 17:53:28 alambix multipathd: mpath2: remaining active paths: 1
Sep 28 17:53:32 alambix multipathd: 8:96: readsector0 checker reports
path is up
Sep 28 17:54:07 alambix multipathd: 8:96: reinstated
Sep 28 17:54:07 alambix multipathd: mpath2: remaining active paths: 2
Sep 28 17:54:07 alambix multipathd: 8:96: mark as failed
Sep 28 17:54:07 alambix multipathd: mpath2: remaining active paths: 1
Sep 28 17:54:12 alambix multipathd: 8:96: readsector0 checker reports
path is up
Sep 28 17:54:12 alambix multipathd: 8:96: reinstated
Sep 28 17:54:12 alambix multipathd: mpath2: remaining active paths: 2
There are no message from the qla2400 driver saying that
the fibre link is down or whatever, like when removing a fibre.
Also, after adding a new slice/LUN and rebooting, the
"flap" problem changed of hardware path, which makes a hardware
problem rather impossible, and indicating a logical problem.
the /etc/multipath.conf we are using:
#devnode_blacklist {
# devnode "*"
#}
## Use user friendly names, instead of using WWIDs as names.
defaults {
user_friendly_names yes
#path_grouping_policy failover
polling_interval 1
#path_checker tur
no_path_retry 3
}
device {
vendor "SUN"
product "T4"
#path_grouping_policy multibus
path_grouping_policy failover
#getuid_callout "/sbin/scsi_id -g -u -s"
#features "1 queue_if_no_path"
}
We've tried all the commented configuration parameter
with no sucess.
The output of "multipath -l":
mpath2 (360003ba4d2f4200044aa7a1c0008ef8a)
[size=200 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [active]
\_ 1:0:0:29 sdd 8:48 [active][ready]
\_ 2:0:0:29 sdg 8:96 [active][ready]
mpath4 (360003ba4d2f4200044aa7a61000e5d3a)
[size=18 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [enabled]
\_ 1:0:0:31 sdc 8:32 [active][ready]
\_ 2:0:0:31 sdf 8:80 [active][ready]
mpath3 (360003ba4d2f4200044aa7a40000c2246)
[size=119 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [enabled]
\_ 1:0:0:30 sde 8:64 [active][ready]
\_ 2:0:0:30 sdh 8:112 [active][ready]
thanks a lot.
--
Network & System Engineer
Goelaan SA, Switzerland
Tel. +41-22-960 98 20
Fax +41-22-960 98 21
http://www.goelaan.ch
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