How can AIX get the disk serial number? Post: 302968689

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Operating Systems AIX How can AIX get the disk serial number? Post 302968689 by MichaelFelt on Sunday 13th of March 2016 02:56:01 PM

03-13-2016

Registered User

* What I recall is that VPD is provided by the device (driver) via queries - as agent.kgb suggested.

* The VPD (or ODM file CuVPD (for Cu(rrent) VPD is primarily, perhaps solely, as a way to determine the firmware of a device without actually querying the device. What I also recall is when VPD status is changed (e.g., a new disk drive firmware) the VPD is updated.

** So, who is responsible? The device driver would be my simple answer.

* A related question (that you did not pose) is how does AIX keep track of a disk - is it new, or just moved within the system?

The primary means to identify a disk (volume) is to use the PVID - which is an ID that AIX assigns when the disk (aka volume) is first assigned to a volume group. There is a second attribute "unique_id" that may also be used. This value, most generally, is derived from a WWID of some kind especially for LUNs from SAN, or VSCSI.

So, a virtual (scsi) disk may not have any VPD data - as it is not physical!

As an example, my hdisk0 - it's VSCSI.

Code:

michael@x071:[/home/michael/]odmget -q name=hdisk0 CuDv

CuDv:
        name = "hdisk0"
        status = 1
        chgstatus = 2
        ddins = "scsidisk"
        location = ""
        parent = "vscsi0"
        connwhere = "810000000000"
        PdDvLn = "disk/vscsi/vdisk"

Code:

michael@x071:[/home/michael/]odmget -q name=hdisk0 CuAt

CuAt:
        name = "hdisk0"
        attribute = "unique_id"
        value = "352000c291f5ae0a75a5000000000000000005VDASD03AIXvscsi"
        type = "R"
        generic = ""
        rep = "n"
        nls_index = 0

CuAt:
        name = "hdisk0"
        attribute = "pvid"
        value = "00c291f5ae30ce0b0000000000000000"
        type = "R"
        generic = "D"
        rep = "s"
        nls_index = 11

Code:

michael@x071:[/home/michael/]odmget -q name=hdisk0 CuVPD
# no output !

Hope this helps your understanding of AIX disk administration.

MichaelFelt

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LEARN ABOUT DEBIAN

blt_treenodeid

Blt_TreeNodeId(3)					      BLT Library Procedures						 Blt_TreeNodeId(3)

__________________________________________________________________________________________________________________________________________________

NAME

       Blt_TreeNodeId - Returns the node serial number.

SYNOPSIS

       #include <bltTree.h>

       unsigned int
       Blt_TreeNodeId(node)

ARGUMENTS

       Blt_TreeNode   node   (in)      Node whose ID is to be returned.
_________________________________________________________________

DESCRIPTION

       This  procedure	returns the node serial number.  The node serial number is useful for programs that export the tree data object to the Tcl
       programming level.  Since node labels (and therefore pathnames) are not unique, the ID can be used to uniquely identify a node.

       The arguments are as follows:

       node	 The node whose serial number is returned.  The serial number of the root node for example is always 0.

RETURNS

       The serial number of the node.  Nodes are given a unique serial number when they are created.  You can use the ID  to  later  retrieve  the
       node using Blt_TreeGetNode.

EXAMPLE

       The following example prints the ID of a node.

	      printf("root ID is %s
", Blt_TreeNodeId(node));

KEYWORDS

       Tcl_TreeCreateNode, Tcl_TreeDeleteNode

BLT
									2.4							 Blt_TreeNodeId(3)

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blt_treenodeid