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Old 01-10-2010, 11:54 PM   #1
xgxiaofei
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Registered: Jan 2010
Posts: 2

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multipathing


hi,our oracle(oracle 10G) server got a serious problem, the OS is SLES 9 SP4, two HBA adapters(QLogic 2340) with NetApp FC Storage(FAS3140), we have installed multipath-tools on this server and ensure that physical connection and swith configuration are correct, but we only can see a path? any advices will be appreciated.

:~ # multipath -ll
360a98000572d4d414b4a522d7a62376d dm-2 NETAPP,LUN
[size=200G][features=0][hwhandler=0]
\_ round-robin 0 [prio=1][active]
\_ 1:0:0:21 sdb 8:16 [active][ready]

lspci
0000:03:03.0 Fibre Channel: QLogic Corp. ISP2312-based 2Gb Fibre Channel to PCI-X HBA (rev 02)
0000:04:04.0 Fibre Channel: QLogic Corp. ISP2312-based 2Gb Fibre Channel to PCI-X HBA (rev 02)

:~ # rpm -q multipath-tools
multipath-tools-0.4.7-75.21

:~ # rpm -qa | grep device*
device-mapper-1.01.01-1.6

/etc/multipath.conf
:~ # less /etc/multipath.conf
##
## This is a template multipath-tools configuration file
## Uncomment the lines relevent to your environment
##
defaults {
udev_dir /dev
polling_interval 10
selector "round-robin 0"
path_grouping_policy failover
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout /bin/true
path_checker readsector0
rr_min_io 100
rr_weight priorities
failback immediate
no_path_retry fail
user_friendly_names no
}
blacklist {
devnode "^sda"
}

devices
{
device
{
vendor "NETAPP"
product "LUN"
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/sbin/mpath_prio_netapp /dev/%n"
features "1 queue_if_no_path"
hardware_handler "0"
path_grouping_policy group_by_prio
failback immediate
rr_weight uniform
rr_min_io 128
path_checker readsector0
}
}

Last edited by xgxiaofei; 01-10-2010 at 11:56 PM.
 
Old 01-11-2010, 08:01 AM   #2
willl_d
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Registered: May 2007
Location: Vienna, VA
Distribution: RHEL, Fedora, Ubuntu, AIX, Mint, Solaris
Posts: 14

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Double check your FC switch configuration and your cabling. The config looks correct, and even if it wasn't, I don't see anything there that would prevent you from seeing that second path.
 
Old 01-12-2010, 06:24 AM   #3
elcody02
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Registered: Jun 2007
Posts: 52

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To see how many paths the hba driver sees "cat /proc/scsi/scsi"?
It might be that you are using the qlogic driver with failover enabled. Then you need to disable it.
In order to validate issue "modinfo qla2300" and "cat /proc/scsi/qla*/*"?

If you post those infos it might be easier to decide from where the problem resides.
 
  


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