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



Have you tried moving the data to another lun and deleting the lun with errors and recreating that lun? I know that involves downtime unless you have some type of failover implemented.

berthiaume_wayne emc com wrote:
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.

Regards,
Wayne.
-----Original Message-----
From: linux-cluster-bounces redhat com
[mailto:linux-cluster-bounces 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
Hello,
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
error.

here is a multipathd -ll output :

[root 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
/block/%n"
                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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