Hi,
I am using multipath for the first time with little joy.
1. The requirement was to test SAN storage on a Redhat RHEL V4 Q2.
I have a 1 TByte lun pointed at the server from the SAN.
The are 4 QLOGIC HBAs attached.
From /etc/sysconfig/hwconf:
driver: qla2300
desc: "QLogic Corp. QLA2312 Fibre Channel Adapter"
2. After correcting the qlogic firmware setup (during server boot) and running ql-dynamic-tgt-lun-disc.sh ( utility from the QLOGIC website) I could see 4 new disk devices. sda - sdd.
The ouput from ql-dynamic-tgt-lun-disc.sh looks like this:
DEVICE
[H:C:T:L]
[0:0:0:0]
[0:0:0:1]
[1:0:0:0]
[1:0:0:1]
[2:0:0:0]
[2:0:0:1]
[3:0:0:0]
[3:0:0:1]
3. I installed the following rpms for multipath support ( from the Redhat site).
rpm -ivh sysfsutils-1.2.0-1.i386.rpm - pre-req
device-mapper-multipath-0.4.5-6.0.RHEL4.i386.rpm
4.Starting the multipathd daemon at first did nothing.
I then did some google'ing and did the following:
modprobe dm-multipath
modprobe dm-round-robin
based on some other documents I made the following changes to /etc/multipath.conf
# Blacklist all devices by default. Remove this to enable multipathing # on the default devices.
#devnode_blacklist {
# devnode "*"
#}
above paragraph commented out
##
## This is a template multipath-tools configuration file ## Uncomment the lines relevent to your environment ## defaults {
multipath_tool "/sbin/multipath -v0"
udev_dir /dev
polling_interval 10
default_selector "round-robin 0"
default_path_grouping_policy multibus
default_getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
default_prio_callout "/bin/true"
default_features "0"
rr_wmin_io 100
failback immediate
}
Removed comments from above default stanza
device {
vendor "COMPAQ "
product "MSA1000 VOLUME "
path_grouping_policy multibus
path_checker tur
}
Removed comments from above device stanza for MSA1000 VOLUME
The rest of the config file is all commented out.
I ran
multipath –v3 to recreate I get the following:
[root@brli036a mapper]# multipath -v3
cciss!c0d0 blacklisted
deleted rest of blacklist output
path sda not found in pathvec
===== path sda =====
bus = 1
dev_t = 8:0
size = 3906810493
vendor = HP
product = MSA VOLUME
rev = 6.86
h:b:t:l = 0:0:0:1
tgt_node_name = 0x500508b300930230
serial = PB9840PX3TF0C0
path checker = readsector0 (internal default)
state = 2
getprio = /bin/true (internal default)
prio = 0
getuid = /sbin/scsi_id -g -u -s /block/%n (internal default)
uid = 3600508b300930230a7495ae1b9500074 (callout)
path sdb not found in pathvec
===== path sdb =====
bus = 1
dev_t = 8:16
size = 3906810493
vendor = HP
product = MSA VOLUME
rev = 6.86
h:b:t:l = 1:0:0:1
tgt_node_name = 0x500508b300930230
serial = PB9840PX3TJ0FU
path checker = readsector0 (internal default)
state = 2
getprio = /bin/true (internal default)
prio = 0
getuid = /sbin/scsi_id -g -u -s /block/%n (internal default)
uid = 3600508b300930230a7495ae1b9500074 (callout)
path sdc not found in pathvec
===== path sdc =====
bus = 1
dev_t = 8:32
size = 3906810493
vendor = HP
product = MSA VOLUME
rev = 6.86
h:b:t:l = 2:0:0:1
tgt_node_name = 0x500508b300930230
serial = PB9840PX3TF0C0
path checker = readsector0 (internal default)
state = 2
getprio = /bin/true (internal default)
prio = 0
getuid = /sbin/scsi_id -g -u -s /block/%n (internal default)
uid = 3600508b300930230a7495ae1b9500074 (callout)
path sdd not found in pathvec
===== path sdd =====
bus = 1
dev_t = 8:48
size = 3906810493
vendor = HP
product = MSA VOLUME
rev = 6.86
h:b:t:l = 3:0:0:1
tgt_node_name = 0x500508b300930230
serial = PB9840PX3TJ0FU
path checker = readsector0 (internal default)
state = 2
getprio = /bin/true (internal default)
prio = 0
getuid = /sbin/scsi_id -g -u -s /block/%n (internal default)
uid = 3600508b300930230a7495ae1b9500074 (callout)
#
# all paths :
#
3600508b300930230a7495ae1b9500074 0:0:0:1 sda 8:0 [MSA VOLUME ]
3600508b300930230a7495ae1b9500074 1:0:0:1 sdb 8:16 [MSA VOLUME ]
3600508b300930230a7495ae1b9500074 2:0:0:1 sdc 8:32 [MSA VOLUME ]
3600508b300930230a7495ae1b9500074 3:0:0:1 sdd 8:48 [MSA VOLUME ]
pgpolicy = multibus (config file default)
selector = round-robin 0 (internal default)
features = 0 (internal default)
hwhandler = 0 (internal default)
0 3906810493 multipath 0 0 1 1 round-robin 0 4 1 8:0 1000 8:16 1000 8:32 1000 8:48 1000
action preset to 0
action set to 4
create: 3600508b300930230a7495ae1b9500074
[size=1 TB][features="0"][hwhandler="0"]
\_ round-robin 0
\_ 0:0:0:1 sda 8:0
\_ 1:0:0:1 sdb 8:16
\_ 2:0:0:1 sdc 8:32
\_ 3:0:0:1 sdd 8:48
device-mapper ioctl cmd 14 failed: Invalid argument
message 3600508b300930230a7495ae1b9500074 0 switch_group 1
failed
Note sure if "path sdX not found in pathvec" relevant
anyway no mpaths have been created.
I hope there is someone out there who can give me some help with this.
with regards,
Julian Rogan
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