Re: OT - File System to Disk Mapping

A logical volume is not necessarily associated with a single disc as in most cases people tend to mirror/stripe a volume group across many disks before creating logical volumes in the volume group.

However, if you execute

    vgdisplay -v /dev/vg00

then the tail end of the report will show you the list of physical volumes (i.e. discs) associated with the volume group.

   PV Name                     /dev/dsk/c0t5d0
   PV Status                   available
   Total PE                    2169
   Free PE                     1328
   Autoswitch                  On

You will also get a list of the logical volumes in the volume group

   LV Name                     /dev/vg00/lvol3
   LV Status                   available/syncd
   LV Size (Mbytes)            140
   Current LE                  35
   Allocated PE                35
   Used PV                     1

If you want to track down extreme levels of detail, you can issue:

    lvdisplay -v /dev/vg00/lvol3

Amongst other things, this will tell you how much of that logical volume is on each physical volume of the volume group

• Distribution of logical volume --- PV Name LE on PV PE on PV /dev/dsk/c0t5d0 35 35
  • Logical extents --- LE PV1 PE1 Status 1 00000 /dev/dsk/c0t5d0 00277 current 00001 /dev/dsk/c0t5d0 00278 current 00002 /dev/dsk/c0t5d0 00279 current

Jonathan Lewis

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-----Original Message-----
To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com> Date: 23 August 2001 05:03

|Hello all,
|
|If I want to know from the unix system point of view, which disk is
being bombarded by a particular data file, how do I come to know. I have used the mount command but that gives me the logical volume, but does not give the disk name that it is hitting.
|
|This is on hp11. I can come to know from the mount command that
oracle datafiles are on /dev/vg00/lvol3
|
|But I want to know which disk does /dev/vg00/lvol3 hit? whether it
hits disk c1t2d0 or c2t2d0 ?
|
|Any unix guru can tell me what command to see apart from mount which
I have used?
|
|thanks.
|
|raja
|

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Author: Jonathan Lewis
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