LinuxQuestions.org - Disk information when RAID is enabled.

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Disk information when RAID is enabled.

I am working on :

SUSE Linux Enterprise Server 10 (ia64)
VERSION = 10
PATCHLEVEL = 2

Example 1:If Raid is enabled on disk then the information in cat /proc/partitions is shown as :

104 0 35532720 cciss/c0d0
104 1 2104483 cciss/c0d0p1
104 2 33423232 cciss/c0d0p2
104 16 35532720 cciss/c0d1
104 32 35532720 cciss/c0d2

Example2:If normal disk is taken the output is as follows:

8 0 35566480 sda
8 1 102383 sda1
8 2 409600 sda2
8 3 210925 sda3
8 4 2104515 sda4
8 5 32739023 sda5

According to my application I need to find out the information of the disk .

Please can you tell me how can I get disk information when my system is RAID enabled(cat /proc/partitions shows the entry of the controllers in example 1).

Can we get Partitions information of the Disk when Disk are connected to system by controller ?

Any Pionters towards answers are welcomed.
Thanks
Roli

Look at this post, for info on how to query the drives in the array.
http://www.linuxquestions.org/questi...06#post3295106

Code:

mail:~# cat /proc/partitions

major minor  #blocks  name



 104    0  143307832 cciss/c0d0

 104    1    240943 cciss/c0d0p1

 104    2    2931862 cciss/c0d0p2

 104    3    2931862 cciss/c0d0p3

 104    4          1 cciss/c0d0p4

 104    5  19535008 cciss/c0d0p5

 104    6    1951866 cciss/c0d0p6

 104    7    7815591 cciss/c0d0p7

 104    8    2931831 cciss/c0d0p8

 104    9  104968678 cciss/c0d0p9







mail:~# fdisk -l 



Disk /dev/cciss/c0d0: 146.7 GB, 146747220480 bytes

255 heads, 63 sectors/track, 17841 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes



          Device Boot      Start        End      Blocks  Id  System

/dev/cciss/c0d0p1  *          1          30      240943+  83  Linux

/dev/cciss/c0d0p2              31        395    2931862+  83  Linux

/dev/cciss/c0d0p3            396        760    2931862+  82  Linux swap / Solaris

/dev/cciss/c0d0p4            761      17841  137203132+  5  Extended

/dev/cciss/c0d0p5            761        3192    19535008+  83  Linux

/dev/cciss/c0d0p6            3193        3435    1951866  83  Linux

/dev/cciss/c0d0p7            3436        4408    7815591  83  Linux

/dev/cciss/c0d0p8            4409        4773    2931831  83  Linux

/dev/cciss/c0d0p9            4774      17841  104968678+  83  Linux





mail:~# mount

/dev/cciss/c0d0p2 on / type ext3 (rw,errors=remount-ro)

/dev/cciss/c0d0p1 on /boot type ext3 (rw)

/dev/cciss/c0d0p5 on /home type ext3 (rw)

/dev/cciss/c0d0p9 on /opt type ext3 (rw)

/dev/cciss/c0d0p6 on /tmp type ext3 (rw)

/dev/cciss/c0d0p7 on /usr type ext3 (rw)

/dev/cciss/c0d0p8 on /var type ext3 (rw)

The difference between the raid and non-raid is in the naming convention.
the list below shows how the partitions and disk naming conventions would compare.

/dev/sda1 = /dev/cciss/c0d0p1
/dev/sda2 = /dev/cciss/c0d0p2
/dev/sda3 = /dev/cciss/c0d0p3

/dev/sdb1 = /dev/cciss/c0d1p1
/dev/sdb2 = /dev/cciss/c0d1p2
/dev/sdb3 = /dev/cciss/c0d1p3

c0d0p1
c0 = Controller Number
d0 = Logical Disk Number
px = Partition number

Does that help or did I miss the mark entirely for what you were trying to figure out ?

Thanks For the Information.
As far as my understanding is concerned we can see the names of controllers present on our system in /dev/cciss. But the problem that I am facing is that I see a list of only 1 controller in /dev/cciss. My concern is now to find out how many disks are connected to my system/controller is there a way we can do it in Linux.

Guess maybe I should have provided a link to info about Linux management tools for the HP smartarray... For some reason I didn't even think about that when i did my last post..

http://hwraid.le-vert.net/wiki/SmartArray - hpacucli described on this page looks like it will do exactly what you want.

http://cciss.sourceforge.net/ - Scroll down to the utilities section for more tool options

hpacucli
This tool is a proprietary one created by HP. It can do both reporting and management.

List physical drives on controller in slot 0:

Code:

server:~# hpacucli ctrl slot=0 pd all show status



physicaldrive 1:0 (port 1:id 0, 36.4 GB): OK

physicaldrive 1:1 (port 1:id 1, 36.4 GB): OK

physicaldrive 1:2 (port 1:id 2, 146.8 GB): OK

physicaldrive 1:3 (port 1:id 3, 146.8 GB): OK