# cat /etc/redhat-release
CentOS Linux release 7.1.1503 (Core)
# uname -r
3.10.0-123.20.1.el7.x86_64
Hi,
We use iSCSI over a 10G Ethernet Adapter and SRP over an Infiniband adapter to provide multipathing
to our storage:
# lspci | grep 10-Gigabit
81:00.0 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
81:00.1 Ethernet controller: Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection (rev 01)
# lspci | grep Mellanox
06:00.0 InfiniBand: Mellanox Technologies MT26428 [ConnectX VPI PCIe 2.0 5GT/s - IB QDR / 10GigE]
(rev b0)
Originally the HBAs came up as host0, host1 and host2. After recent reboots we get host1, host2 and
host3:
# ls -l /sys/class/scsi_host/host*
lrwxrwxrwx. 1 root root 0 Apr 9 19:10 /sys/class/scsi_host/host1 ->
../../devices/platform/host1/scsi_host/host1
lrwxrwxrwx. 1 root root 0 Apr 9 08:12 /sys/class/scsi_host/host2 ->
../../devices/pci0000:00/0000:00:03.2/0000:06:00.0/host2/scsi_host/host2
lrwxrwxrwx. 1 root root 0 Apr 9 08:12 /sys/class/scsi_host/host3 ->
../../devices/pci0000:00/0000:00:03.2/0000:06:00.0/host3/scsi_host/host3
I've observed that at different times during configuration of this host we have had varying
combinations of the mapping of HBA to an enumerated /sys node. e.g.:
host0
host2
host3
or
host1
host3
host4
other combinations, etc.
This messes up our multipath filtering for weightedpath priority settings. From /etc/multipath.conf:
defaults {
user_friendly_names no
find_multipaths yes
prio weightedpath
prio_args "hbtl 0:.:.:.* 1 [1-9]:.:.:.* 10"
path_grouping_policy group_by_prio
path_selector "service-time 0"
failback immediate
polling_interval 5
no_path_retry 12
}
The setting for prio_args fails to set the correct path map topology and priority against an HBA as
I can't predict what HBA is what. Consistently iSCSI claims the lowest number but I can't say if
that's going to be 0 or 1 a this stage.
Does anyone know how to configure HBAs to stay on a fixed enumeration at boot?
Kind regards,
Tom
--
Tom Robinson
IT Manager/System Administrator
MoTeC Pty Ltd
121 Merrindale Drive
Croydon South
3136 Victoria
Australia
T: +61 3 9761 5050
F: +61 3 9761 5051
E: tom.robinson at motec.com.au
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