Re: Need Help

[Chandra Seetharaman <sekharan@us.ibm.com>]

Without the /etc/fstab, this is my hunch: you are using /dev/mpath
in /etc/fstab. Try /dev/mapper instead.

On Thu, 2008-01-17 at 08:35 -0600, Nath, Varun wrote:
> 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@x mpath]# pwd
> 
> /dev/mpath
> 
> [root@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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-- 

----------------------------------------------------------------------
    Chandra Seetharaman               | Be careful what you choose....
              - sekharan@us.ibm.com   |      .......you may get it.
----------------------------------------------------------------------