LUN Visibility

[saranraj456]

Hello,

can anyone  provide me the steps to find the diffrence B/w LUN and Local disk in host like windows2003,windows 2008,solaris,linux with the help of HUK and also without it?

Cheers,

Saran

[baijulal]

Are you looking to identify which are local disk and whichare LUINS presented on that host ?

[saranraj456]

Yeah,  i am looking for that info

[rwelshman]

If you look in Device Manager at the Disk Drives - the manufacteur of the disk is usually listed - so Netapp disks would be a NetApp LUN, for example.

[saranraj456]

Thanks for the info!

That things will be used in windows,for unix host like LINUX,Solaris what would be the method/cmd to find out?

[arunchak]

HI,

For Linux, install sansurfer package and say “sanlun lun show”. Hope this is useful.

Thanks,

Arun

[saranraj456]

.

I am bit curious to know how could we differentiate LUN and Local disk ,without a HUK / Sansurfer packages installed ?.We came across such a difficulty in an incompatible machine that doesnt have any package to install.

Cheers,

Saran

[arunchak]

Hi,

So you want to find the LUN’s connected without any external packages like sansurfer being installed.

Try out: ls -l /sys/block/*/device

Thanks,

Arun

[arunchak]

To give you an analogy:

[root@warspite ~]# ls -l /sys/block/*/device

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/hda/device -> ../../devices/ide0/0.0

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sda/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.0/0000:04:01.0/host0/target0:0:0/0:0:0:0

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sdb/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.0/0000:04:01.0/host0/target0:0:1/0:0:1:0

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sdc/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.2/0000:05:01.0/host3/rport-3:0-2/target3:0:0/3:0:0:0

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sdd/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.2/0000:05:01.0/host3/rport-3:0-2/target3:0:0/3:0:0:1

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sde/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.2/0000:05:01.0/host3/rport-3:0-2/target3:0:0/3:0:0:3

[root@warspite ~]# sanlun lun show

controller:           lun-pathname           device filename  adapter  protocol          lun size         lun state

       cos:  /vol/NikhilSetupVMware/vcslun1  /dev/sdc         host3    FCP           30g (32212254720)    GOOD

        cos:  /vol/NikhilSetupVMware/vcslun2  /dev/sdd         host3    FCP           10g (10737418240)    GOOD

        cos:  /vol/NikhilSetupVMware/OC50VCS  /dev/sde         host3    FCP           10g (10737418240)    GOOD

The ones that are bolded from the command " ls -l /sys/block/*/device" are the LUNs connected - which are also shown in sanlun lun show.

Thanks,

  Arun

[saranraj456]

Thanks arun!

What is the way to find the LUN exactly,when the host contains multiple LUN's with same size.?

[arunchak]

HI,

See, with sansurfer or other software it should be easy. Otherwise, I am not very sure but can give you a hint:

In the output I gave you for analogy:

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sdc/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.2/0000:05:01.0/host3/rport-3:0-2/target3:0:0/3:0:0:0

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sdd/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.2/0000:05:01.0/host3/rport-3:0-2/target3:0:0/3:0:0:1

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sde/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.2/0000:05:01.0/host3/rport-3:0-2/target3:0:0/3:0:0:3

were the 3 LUNs mapped to the host.

Now From filer view, the id’s of these 3 Luns mapped to this host are as follows:

Lun name - vcslun2               Lun id - 1

vcslun1 -                                                  0

OC5OVCS –                                             3

If you see thelast digit of the output above (target mapped to):

ie.

target3:0:0/3:0:0:0

target3:0:0/3:0:0:1

target3:0:0/3:0:0:3

and map the Lun id, you should be able to differentiate.

So,

lrwxrwxrwx 1 root root 0 Aug 20 00:20 /sys/block/sdd/device -> ../../devices/pci0000:00/0000:00:04.0/0000:03:00.2/0000:05:01.0/host3/rport-3:0-2/target3:0:0/3:0:0:1

i.e device sdd should be the LUN vcslun2

Thanks,

  Arun

[arunchak · Accepted solution]

You can also find the vendor of the LUN and the id by executing "cat /proc/scsi/scsi" in RHEL

[root@warspite ~]# cat /proc/scsi/scsi

Attached devices:

Host: scsi0 Channel: 00 Id: 00 Lun: 00

  Vendor: IBM-ESXS Model: CBR036C31210ESFN Rev: DFQG

  Type:   Direct-Access                    ANSI SCSI revision: 04

Host: scsi0 Channel: 00 Id: 01 Lun: 00

  Vendor: IBM-ESXS Model: ST336607LC    FN Rev: B25H

  Type:   Direct-Access                    ANSI SCSI revision: 03

Host: scsi0 Channel: 00 Id: 08 Lun: 00

  Vendor: IBM      Model: 25P3495a S320  1 Rev: 1

  Type:   Processor                        ANSI SCSI revision: 02

Host: scsi3 Channel: 00 Id: 00 Lun: 00

  Vendor: NETAPP   Model: LUN              Rev: 7330

  Type:   Direct-Access                    ANSI SCSI revision: 04

Host: scsi3 Channel: 00 Id: 00 Lun: 01

  Vendor: NETAPP   Model: LUN              Rev: 7330

  Type:   Direct-Access                    ANSI SCSI revision: 04

Host: scsi3 Channel: 00 Id: 00 Lun: 03

  Vendor: NETAPP   Model: LUN              Rev: 7330

  Type:   Direct-Access                    ANSI SCSI revision: 04

Thanks,

  Arun

[saranraj456]

Arun,

is it possible by anyway to find the LUN using a serial number in it?

Cheers,
Saran

[arunchak]

HI,

  LUN id is the unique identifier between the host and the filer (storage) to differentiate between LUNs. There should be a way to find the LUN using serial number. I am currently not aware of it. Will let you know if I find anything.

Thanks,

  Arun

[saranraj456]

Arun,

We have used luxadm in solaris to find out the serial no with the help of that we can match the LUN with Serial No.

# luxadm display /dev/rdsk/c0t600015D0002028000000000000001142d0s2

DEVICE PROPERTIES for disk: /dev/rdsk/c0t600015D0002028000000000000001142d0s2

  Vendor:     SUN

  Product ID:     SE6920

  Revision:     0202

  Serial Num:     00500057

  Unformatted capacity:     10240.000 MBytes

  Read Cache:     Enabled

    Minimum prefetch:     0x0

    Maximum prefetch:     0xffff

  Device Type:     Disk device

  Path(s):

  /dev/rdsk/c0t600015D0002028000000000000001142d0s2

  /devices/scsi_vhci/disk@g600015d0002028000000000000001142:c,raw

   Controller     /dev/cfg/c4

    Device Address          213600015d207200,0

    Host controller port WWN          210100e08b206812

    Class          primary

    State          ONLINE

   Controller     /dev/cfg/c11

    Device Address          213600015d207200,0

    Host controller port WWN          210100e08b30a2f2

    Class          primary

    State          ONLINE

Cheers,

Saran

[arunchak]

Thanks 

There is an equavelant way by using lscfg in Linux. Guess, I need to install couple of rpm's to make it work.

Thanks,

  Arun