Hi,
I need help with a similar or even the same issue as in the thread mentioned in the Subject
(https://www.redhat.com/archives/dm-devel/2008-October/msg00130.html).
On two PowerEdge 2970 with CentOS 5.3 connected to a MD3000i I get the following messages in /var/log/messages
Jun 24 17:57:49 ninja multipathd: dm-3: add map (uevent)
Jun 24 17:57:49 ninja kernel: end_request: I/O error, dev sdc, sector 530184
Jun 24 17:57:49 ninja kernel: device-mapper: multipath: Failing path 8:32.
Jun 24 17:57:49 ninja multipathd: dm-3: devmap already registered
Jun 24 17:57:49 ninja multipathd: 8:32: mark as failed
Jun 24 17:57:49 ninja multipathd: mpath8: remaining active paths: 3
Jun 24 17:57:49 ninja multipathd: dm-3: add map (uevent)
Jun 24 17:57:49 ninja kernel: end_request: I/O error, dev sdd, sector 530184
Jun 24 17:57:49 ninja kernel: device-mapper: multipath: Failing path 8:48.
Jun 24 17:57:49 ninja kernel: device-mapper: multipath: Cannot failover device because scsi_dh_rdac was not loaded.
Jun 24 17:57:49 ninja kernel: device-mapper: multipath: Failing path 8:80.
Jun 24 17:57:49 ninja kernel: device-mapper: multipath: Could not failover device. Error 15.
Jun 24 17:57:49 ninja kernel: device-mapper: multipath: Cannot failover device because scsi_dh_rdac was not loaded.
Jun 24 17:57:49 ninja kernel: device-mapper: multipath: Failing path 8:64.
Jun 24 17:57:49 ninja kernel: device-mapper: multipath: Could not failover device. Error 15.
Jun 24 17:57:49 ninja kernel: GFS2: fsid=ninjo_cluster:gfsfs.0: gfs2_quotad: statfs error -5
Jun 24 17:57:49 ninja multipathd: dm-3: devmap already registered
Jun 24 17:57:50 ninja multipathd: dm-3: add map (uevent)
Jun 24 17:57:50 ninja multipathd: dm-3: devmap already registered
Jun 24 17:57:50 ninja multipathd: dm-3: add map (uevent)
Jun 24 17:57:50 ninja multipathd: dm-3: devmap already registered
Jun 24 17:57:50 ninja multipathd: 8:48: mark as failed
Jun 24 17:57:50 ninja multipathd: mpath8: remaining active paths: 2
Jun 24 17:57:50 ninja multipathd: 8:64: mark as failed
Jun 24 17:57:50 ninja multipathd: mpath8: remaining active paths: 1
Jun 24 17:57:50 ninja multipathd: 8:80: mark as failed
Jun 24 17:57:50 ninja multipathd: mpath8: remaining active paths: 0
Jun 24 17:57:54 ninja multipathd: 8:32: reinstated
Jun 24 17:57:54 ninja multipathd: mpath8: remaining active paths: 1
Jun 24 17:57:54 ninja multipathd: dm-3: add map (uevent)
Jun 24 17:57:54 ninja multipathd: dm-3: devmap already registered
Jun 24 17:57:55 ninja multipathd: 8:64: reinstated
Jun 24 17:57:55 ninja multipathd: mpath8: remaining active paths: 2
Jun 24 17:57:55 ninja multipathd: 8:80: reinstated
Jun 24 17:57:55 ninja multipathd: mpath8: remaining active paths: 3
Jun 24 17:57:55 ninja multipathd: 8:48: reinstated
Jun 24 17:57:55 ninja multipathd: mpath8: remaining active paths: 4
Jun 24 17:57:55 ninja multipathd: dm-3: add map (uevent)
Jun 24 17:57:55 ninja multipathd: dm-3: devmap already registered
Jun 24 17:57:55 ninja multipathd: dm-3: add map (uevent)
Jun 24 17:57:55 ninja multipathd: dm-3: devmap already registered
Jun 24 17:57:55 ninja multipathd: dm-3: add map (uevent)
Jun 24 17:57:55 ninja multipathd: dm-3: devmap already registered
The following additional information can I provide.
[root@ninja redhat]# lsmod | egrep 'rdac|multi'
scsi_dh_rdac 40897 1
dm_multipath 55257 2 dm_round_robin
scsi_dh 41665 2 scsi_dh_rdac,dm_multipath
dm_mod 100369 18 dm_multipath,dm_raid45,dm_snapshot,dm_zero,dm_mirror,dm_log
scsi_mod 196569 10 scsi_dh_rdac,ib_iser,iscsi_tcp,libiscsi,scsi_transport_iscsi,scsi_dh,sg,libata,megaraid_sas,sd_mod
[root@ninja redhat]# multipath -ll
mpath8 (360024e80004ec0de000010324a373eeb) dm-3 DELL,MD3000i
[size=7.5T][features=0][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=200][enabled]
\_ 7:0:0:0 sde 8:64 [active][ghost]
\_ 5:0:0:0 sdf 8:80 [active][ghost]
\_ round-robin 0 [prio=0][enabled]
\_ 8:0:0:0 sdd 8:48 [active][ready]
\_ 6:0:0:0 sdc 8:32 [active][ready]
The multipath version shipped with CentOS 5.3 is multipath-tools v0.4.7 (03/12, 2006).
As I've seen in the mentioned thread something like
echo rdac > /sys/block/sd?/device/dh_state
should fix at least the failover problem.
But I do not see any dh_state in /sys/block/sd?/device/ and I'm not allowed (even as root) to do anything like:
for i in c d e f; do echo rdac > /sys/block/sd$i/device/dh_state; done
At the moment I'd like to avoid building the multipath package by myself with the patch provided in the afore mentioned thread.
Do you have any ideas? Or is a different problem I have.
Every help is appreciated.
All best
Mario
--
Dr. Mario Mech
Institute for Geophysics and Meteorology
University of Cologne
Zuelpicherstr. 49a
50674 Cologne
Germany
t: +49 (0)221 - 470 - 1776
f: +49 (0)221 - 470 - 5198
e: mech@xxxxxxxxxxxxxxxxxx
w: http://www.meteo.uni-koeln.de/~mmech/
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