Equallogic storage
Qlogic 4052c HBAs (2 ports)
RHEL4.5
device-mapper-multipath-0.4.5-21.RHEL4
HP-GigE switches
/etc/multipath.conf using failover mode
defaults {
multipath_tool "/sbin/multipath -v0"
udev_dir /dev
#polling_interval 2
polling_interval 4
selector "round-robin 0"
path_grouping_policy failover
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
path_checker readsector0
prio_callout "/bin/true"
features "0"
#rr_min_io 2
rr_min_io 100
rr_weight priorities
failback immediate
no_path_retry fail
user_friendly_name yes
}
Here is the problem:
Dec 20 05:28:32 192.168.46.31/192.168.46.31 kernel: SCSI error : <2 0 5 0> return code = 0x10000
Dec 20 05:28:32 192.168.46.31/192.168.46.31 multipathd: 65:16: readsector0 checker reports path is up
Dec 20 05:28:32 192.168.46.31/192.168.46.31 kernel: device-mapper: dm-multipath: Failing path 8:96.
Dec 20 05:28:32 192.168.46.31/192.168.46.31 multipathd: 65:16: reinstated
Dec 20 05:28:32 192.168.46.31/192.168.46.31 multipathd: ban1.banprod: remaining active paths: 2
Dec 20 05:28:32 192.168.46.31/192.168.46.31 multipathd: 8:96: readsector0 checker reports path is down
Dec 20 05:28:32 192.168.46.31/192.168.46.31 multipathd: checker failed path 8:96 in map ban1.datafiles.famp
Dec 20 05:28:32 192.168.46.31/192.168.46.31 multipathd: ban1.datafiles.famp: remaining active paths: 1
Dec 20 05:28:35 192.168.46.31/192.168.46.31 kernel: SCSI error : <2 0 8 0> return code = 0x10000
Dec 20 05:28:35 192.168.46.31/192.168.46.31 multipathd: 8:144: readsector0 checker reports path is down
Dec 20 05:28:35 192.168.46.31/192.168.46.31 multipathd: checker failed path 8:144 in map ban1.datafiles.wflw
Dec 20 05:28:35 192.168.46.31/192.168.46.31 kernel: device-mapper: dm-multipath: Failing path 8:144.
Dec 20 05:28:37 192.168.46.31/192.168.46.31 multipathd: ban1.datafiles.wflw: remaining active paths: 1
Dec 20 05:28:37 192.168.46.31/192.168.46.31 multipathd: 8:96: readsector0 checker reports path is up
Dec 20 05:28:37 192.168.46.31/192.168.46.31 multipathd: 8:96: reinstated
Dec 20 05:28:37 192.168.46.31/192.168.46.31 multipathd: ban1.datafiles.famp: remaining active paths: 2
Dec 20 05:28:39 192.168.46.31/192.168.46.31 multipathd: 8:144: readsector0 checker reports path is up
Dec 20 05:28:39 192.168.46.31/192.168.46.31 multipathd: 8:144: reinstated
Dec 20 05:28:39 192.168.46.31/192.168.46.31 multipathd: ban1.datafiles.wflw: remaining active paths: 2
There is no real pattern to these disconnect/reconnect events. The only setting I'm thinking about changing
currently is the no_path_retry. I'm thinking of making this 2 or some low number. The equallogic shows load balancing
events but they don't always align with the drop/reconnect that I'm seeing on the linux hosts.
Is anyone using these HBAs with equallogic on RHEL4.5 ???
--
:wq!
kevin.foote
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