[dm-devel] Need Help
Pradipmaya Maharana
pradipmaya at gmail.com
Thu Jan 17 18:24:52 UTC 2008
Could you please share the fstab entry (also what you are trying to add to it).
When are you getting the problem (not recognizing devices), is it at boot time?
I am new to Linux but my hunch is when you are booting, as multipath
is loaded, these devices are not getting recognised. In this case you
might want to mkinitrd with dm-multipath.
Thanks,
Pradipmaya.
2008/1/17 Nath, Varun <varun.nath at amd.com>:
>
>
>
> Hi,
>
>
>
> I am trying to configure multipathing on Red hat 4 update 6 64 bit.
>
>
>
> Below is the list of RPM I have installed
>
>
>
> rpm -qa | grep mapper
>
> device-mapper-1.02.21-1.el4
>
> device-mapper-1.02.21-1.el4
>
> device-mapper-multipath-0.4.5-27.RHEL4
>
>
>
> The hardware is Sun x4600 and I am using QLA cards. The system has two LUNs
> presented to it of size 10 GB and size 90 GB
>
>
>
> There is a problem when I configure file system on it. I am able to access
> and mount the file system. But when I add those entries in /etc/fstab, the
> system would not recognize those devices.
>
>
>
> Below is the output from multipath command
>
>
>
> multipath -ll
>
> mpath5 (3600508b40010541d00009000065d0000)
>
> [size=90 GB][features="1 queue_if_no_path"][hwhandler="0"]
>
> \_ round-robin 0 [prio=100][active]
>
> \_ 1:0:0:2 sdd 8:48 [active][ready]
>
> \_ 2:0:0:2 sdh 8:112 [active][ready]
>
> \_ round-robin 0 [prio=20][enabled]
>
> \_ 1:0:1:2 sdf 8:80 [active][ready]
>
> \_ 2:0:1:2 sdj 8:144 [active][ready]
>
>
>
> mpath4 (3600508b40010541d00009000065a0000)
>
> [size=10 GB][features="1 queue_if_no_path"][hwhandler="0"]
>
> \_ round-robin 0 [prio=100][enabled]
>
> \_ 1:0:1:1 sde 8:64 [active][ready]
>
> \_ 2:0:1:1 sdi 8:128 [active][ready]
>
> \_ round-robin 0 [prio=20][enabled]
>
> \_ 1:0:0:1 sdc 8:32 [active][ready]
>
> \_ 2:0:0:1 sdg 8:96 [active][ready]
>
>
>
>
>
> Also, below is my /etc/multipath.conf
>
>
>
> # This is an example configuration file for device mapper multipath.
>
> # For a complete list of the default configuration values, see
>
> # /usr/share/doc/device-mapper-multipath-0.4.5/multipath.conf.defaults
>
> # For a list of configuration options with descriptions, see
>
> # /usr/share/doc/device-mapper-multipath-0.4.5/multipath.conf.annotated
>
>
>
>
>
> # Blacklist all devices by default. Remove this to enable multipathing
>
> # on the default devices.
>
> #devnode_blacklist {
>
> # devnode "*"
>
> #}
>
>
>
> ## Use user friendly names, instead of using WWIDs as names.
>
> defaults {
>
> user_friendly_names yes
>
> selector "round-robin 0"
>
> }
>
>
>
>
>
> ## By default, devices with vendor = "IBM" and product = "S/390.*" are
>
> ## blacklisted. To enable mulitpathing on these devies, uncomment the
>
> ## following lines.
>
> #devices {
>
> # device {
>
> # vendor "IBM"
>
> # product "S/390 DASD ECKD"
>
> # path_grouping_policy multibus
>
> # getuid_callout "/sbin/dasdview -j -f /dev/%n"
>
> # path_checker directio
>
> # }
>
> #}
>
>
>
>
>
> ##
>
> ## 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 multibus
>
> # 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_name yes
>
> #}
>
> ##
>
> ## The wwid line in the following blacklist section is shown as an example
>
> ## of how to blacklist devices by wwid. The 3 devnode lines are the
>
> ## compiled in default blacklist. If you want to blacklist entire types
>
> ## of devices, such as all scsi devices, you should use a devnode line.
>
> ## However, if you want to blacklist specific devices, you should use
>
> ## a wwid line. Since there is no guarantee that a specific device will
>
> ## not change names on reboot (from /dev/sda to /dev/sdb for example)
>
> ## devnode lines are not recommended for blacklisting specific devices.
>
> ##
>
> devnode_blacklist {
>
> wwid 3600508e000000000ed7fb52911133c06
>
> devnode "^(ram|raw|loop|fd|md|sr|scd|st)[0-9]*"
>
> devnode "^hd[a-z]"
>
> }
>
> #multipaths {
>
> # multipath {
>
> # wwid 3600508b4000156d700012000000b0000
>
> # alias yellow
>
> # path_grouping_policy multibus
>
> # path_checker readsector0
>
> # path_selector "round-robin 0"
>
> # failback manual
>
> # rr_weight priorities
>
> # no_path_retry 5
>
> # }
>
> # multipath {
>
> # wwid 1DEC_____321816758474
>
> # alias red
>
> # }
>
> #}
>
> #devices {
>
> # device {
>
> # vendor "COMPAQ "
>
> # product "HSV110 (C)COMPAQ"
>
> # path_grouping_policy multibus
>
> # getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
>
> # path_checker readsector0
>
> # path_selector "round-robin 0"
>
> # hardware_handler "0"
>
> # failback 15
>
> # rr_weight priorities
>
> # no_path_retry queue
>
> # }
>
> # device {
>
> # vendor "COMPAQ "
>
> # product "MSA1000 "
>
> # path_grouping_policy multibus
>
> # }
>
> #}
>
>
>
>
>
>
>
>
>
> Here is the contents of the /dev/mpath/
>
>
>
> [root at x mpath]# pwd
>
> /dev/mpath
>
> [root at x mpath]# ls -all
>
> total 0
>
> drwxr-xr-x 2 root root 80 Jan 16 17:34 .
>
> drwxr-xr-x 12 root root 5260 Jan 17 08:17 ..
>
> lrwxrwxrwx 1 root root 7 Jan 16 17:34 mpath4 -> ../dm-8
>
> lrwxrwxrwx 1 root root 7 Jan 16 17:34 mpath5 -> ../dm-9
>
>
>
>
>
>
>
>
>
> Can anyone please help me with this? I think I am missing some configuration
> on the system which is causing this.
>
>
>
> Thanks,
>
>
>
>
> --
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>
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