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Old 01-16-2015, 10:28 AM   #1
keithjn
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Registered: Aug 2009
Posts: 1

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Linux Native Multipath IO timeout


My Oracle RAC 12.1.0.1 runs on ASM. ASM has an I/O timeout of 15 seconds. How do I find my Linux native multipath I/O timeout? I am running RedHat Linux 6 Enterprise, x86-64.
This is the device section of my multipath.conf

devices{
device {
vendor "NETAPP"
product "LUN.*"
path_grouping_policy group_by_prio
getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n"
path_selector "round-robin 0"
path_checker tur
features "3 queue_if_no_path pg_init_retries 50"
hardware_handler "0"
prio ontap
failback immediate
rr_weight uniform
rr_min_io 128
rr_min_io_rq 1
flush_on_last_del yes
fast_io_fail_tmo 5
dev_loss_tmo infinity
retain_attached_hw_handler yes
detect_prio yes
}
}

Thanks,
keith
 
Old 01-16-2015, 10:46 AM   #2
smallpond
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Registered: Feb 2011
Location: Massachusetts, USA
Distribution: CentOS 6 (pre-systemd)
Posts: 2,838

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I believe that fast_io_fail_tmo and dev_loss_tmo are for fibre channel rports.
The SCSI command timer may be viewed or changed independently for each device.

cat /sys/block/sda/device/timeout
30
 
  


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