[Linux-cluster] SAN + multipathd + GFS : SCSI error

berthiaume_wayne at emc.com berthiaume_wayne at emc.com
Mon Aug 13 17:21:51 UTC 2007

These are DID_BUS_BUSY errors being reported by the QLogic driver. I
would check your SAN for congestion, increase the cache in the EVA, or
change the queue depth in your qla2xxx driver.


-----Original Message-----
From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of FM
Sent: Friday, August 10, 2007 9:58 AM
To: Redhat Cluster
Subject: [Linux-cluster] SAN + multipathd + GFS : SCSI error 

All servers are RHEL 4.5
SAN is HP EVA 4000
we are using linux qla modules and multipathd
cluster server have only one FC Card

In the dmesg of servers connected to GFS we have a lot of :
SCSI error : <0 0 1 1> return code = 0x20000
end_request: I/O error, dev sdd, sector 37807111

The cluster seems to work fine but I'd like to know if we can avoid this

here is a multipathd -ll output :

[root at como ~]# multipath -ll
mpath1 (3600508b4001051e40000900000310000)
[size=500 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [prio=50][active]
 \_ 0:0:0:1 sda 8:0  [active][ready]
\_ round-robin 0 [prio=10][enabled]
 \_ 0:0:1:1 sdd 8:48 [active][ready]

mpath3 (3600508b4001051e400009000009e0000)
[size=150 GB][features="1 queue_if_no_path"][hwhandler="0"]
\_ round-robin 0 [prio=50][active]
 \_ 0:0:1:2 sde 8:64 [active][ready]
\_ round-robin 0 [prio=10][enabled]
 \_ 0:0:0:2 sdb 8:16 [active][ready]

and the device in the multipath.conf

devices {
        device {
                vendor                  "HP "
                product                 "HSV200 "
                path_grouping_policy    group_by_prio
                getuid_callout          "/sbin/scsi_id -g -u -s
                path_checker            tur
                path_selector           "round-robin 0"
                prio_callout            "/sbin/mpath_prio_alua %d"
                failback                immediate
                no_path_retry           60

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