Hi,
I'm trying to setup DELL MD3000i with multipathing. The connections
are with crossover cables (no switches), 2 nics on server connected
directly to 2 controlers on storage - 2 paths in total. This storage
is active/passive. My guess is that problem is in multipathing driver
which does not see Vendor and Product attributes and
host:channel:target:lun (as you can see below). I managed to configure
multipathd by setting default values and loaded rdac. This helped me
to get passive path be marked as ghost. I cannot set per device
section, because it is mpath driver doesn't match any device.
The main problem is that if I try change preferred controler then no
mpath partitions are mounted every thing seems fine, but then any
partition is mounted I get a lot IO errors and both paths are marked
as failed.
On the other hand this is my first setup with iscsi and multpathing so
I don't know what to expect. Let say it seems strange for me that in
active/passive situation my linux box doesn't get any info about
partitions on passive virtual disks. How can it do fail over, then
there are no partition block devices of passive controler disks.
Thanks for any hints
Liutauras
Here is a output from various commands:
# multipath -ll
mpath0 (360026b9000372cf3000005384ac4961e) dm-16 ,
[size=20M][features=0][hwhandler=0]
\_ round-robin 0 [prio=3][enabled]
\_ #:#:#:# sdf 8:80 [active][ready]
\_ round-robin 0 [prio=3][enabled]
\_ #:#:#:# sdg 8:96 [active][ready]
mpath8 (360026b9000372ce900000a8f4b14fb0d) dm-15 ,
[size=250G][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=3][enabled]
\_ #:#:#:# sdd 8:48 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ #:#:#:# sde 8:64 [active][ghost]
mpath7 (360026b9000372cf300000ece4b14fa59) dm-14 ,
[size=250G][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=3][enabled]
\_ #:#:#:# sdb 8:16 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ #:#:#:# sdc 8:32 [active][ghost]
# SMdevices
Dell Modular Disk Storage Manager Devices, Version 10.01.A6.01
Built Mon Sep 22 09:20:05 CDT 2008
Copyright (C) 2006 - 2008 Dell Inc. All rights reserved.
/dev/sdg (/dev/sg10) [Storage Array NLV-md3000i, Virtual Disk
Access, LUN 31, Virtual Disk ID <60026b9000372cf3000005384ac4961e>]
/dev/sdb (/dev/sg5) [Storage Array NLV-md3000i, Virtual Disk
VD1_NAV, LUN 1, Virtual Disk ID <60026b9000372cf300000ece4b14fa59>,
Preferred
Path (Controller-0): In Use]
/dev/sdc (/dev/sg6) [Storage Array NLV-md3000i, Virtual Disk
VD1_NAV, LUN 1, Virtual Disk ID <60026b9000372cf300000ece4b14fa59>,
Alternate
Path (Controller-1): Not In Use]
/dev/sdd (/dev/sg7) [Storage Array NLV-md3000i, Virtual Disk
VD2_SQL, LUN 2, Virtual Disk ID <60026b9000372ce900000a8f4b14fb0d>,
Preferred
Path (Controller-0): In Use]
/dev/sde (/dev/sg8) [Storage Array NLV-md3000i, Virtual Disk
VD2_SQL, LUN 2, Virtual Disk ID <60026b9000372ce900000a8f4b14fb0d>,
Alternate
Path (Controller-1): Not In Use]
/dev/sdf (/dev/sg9) [Storage Array NLV-md3000i, Virtual Disk Access,
LUN 31, Virtual Disk ID <60026b9000372cf3000005384ac4961e>]
# cat /etc/mu
multipath.conf multipath.conf_bkp
[root@NLV-xendom0 multipath-tools]# cat /etc/multipath.conf
defaults {
udev_dir /dev
user_friendly_names yes
path_checker rdac
# path_grouping_policy group_by_prio
hardware_handler "1 rdac"
path_grouping_policy failover
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
features "1 queue_if_no_path"
failback immediate
no_path_retry fail
}
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z]"
devnode "^sda"
devnode "^sda[0-9]"
device {
vendor DELL
product "PERC|Universal"
}
}
blacklist_execptions {
device {
vendor "IBM"
product "S/390 DASD.*"
}
}
devices {
device {
vendor "DELL"
product "MD3000i*"
product_blacklist "Universal Xport "
features "1 queue_if_no_path"
hardware_handler "1 rdac"
path_grouping_policy group_by_prio
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
getuid_callout "/lib/udev/scsi_id -g -u -d /dev/%n"
}
}
multipaths {
multipath {
wwid 360026b9000372cf300000ece4b14fa59
alias mpath7
path_grouping_policy group_by_prio
path_selector "round-robin 0"
failback manual
rr_weight priorities
no_path_retry 5
rr_min_io 100
hardware_handler "1 rdac"
}
multipath {
wwid 360026b9000372ce900000a8f4b14fb0d
alias mpath8
path_grouping_policy group_by_prio
path_selector "round-robin 0"
failback manual
rr_weight priorities
no_path_retry 5
rr_min_io 100
hardware_handler "1 rdac"
}
}
# lsscsi
[0:0:32:0] enclosu DP BACKPLANE 1.05 -
[0:2:0:0] disk DELL PERC 6/i 1.11 /dev/sda
[2:0:0:0] cd/dvd TEAC DVD-ROM DV28EV D.AG /dev/sr0
[14:0:0:0] disk DELL MD3000i 0735 -
[14:0:0:1] disk DELL MD3000i 0735 /dev/sdc
[14:0:0:2] disk DELL MD3000i 0735 /dev/sde
[14:0:0:31] disk DELL Universal Xport 0735 /dev/sdg
[15:0:0:0] disk DELL MD3000i 0735 -
[15:0:0:1] disk DELL MD3000i 0735 /dev/sdb
[15:0:0:2] disk DELL MD3000i 0735 /dev/sdd
[15:0:0:31] disk DELL Universal Xport 0735 /dev/sdf
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