hdisks and pdisks

hdisks and pdisks

Post by Ralf Wink » Fri, 16 Oct 1998 04:00:00



Hi,

I am not familiar with SSA but I think the hdisk device is available
before it bekomes a physical disk to the system. The IBM online
dokumentation says:

        To change an available disk to a physical volume, enter:

        chdev -l hdisk3 -a pv=yes

        This causes the available disk (hdisk3 ) to be assigned a
        physical volume identifier (PVID) if it does
        not already have one.

Now you can put it into a volume group.

Ralf    



>I have an H50 that has some SSA disks on it
>that were moved from another machine.
>I believe they were part of an SSA RAID5 array.
>No exportvg, reducevg, etc were done on them
>prior to moving.  Also on this machine I've just
>done a fresh install of 4.3.1 (a 'fluid' environment, no?)
>so only rootvg is defined.

>The problem is I cannot get the machine to assign
>an hdisk to the pdisk.  The only thing that I've tried
>that works is to format the pdisk.  Then I can assign
>an hdisk to it and use the drive.  Is there an easier
>way or do I have to format the disk?

>---
>Gordon Cerswell


----------------------------------------------------------
Ralf Winkel                     |
TUI InfoTec                     | Fon.: +49 511 567 5075
Karl-Wiechert-Allee 23          | Fax.: +49 511 567 1301

 
 
 

1. What's the difference between a pdisk and hdisk

Hello,

Following AIX LVM terminology a VG is a collection of disks. A disk or
PV is represented by hdiskx. For example, hdisk0 is typically the disk
in rootvg. So what then is a pdisk or physical disk?

Carrying out the following commands only serves to confuse the issue:

# lscfg -vp pdisk0 | grep pdisk0
# pdisk0            00-05-P           4GB SSA C Physical Disk Drive

# lscfg -vp hdisk0 | grep hdisk0
# hdisk0            00-07-A1-3,0      2.2 GB 16 Bit SCSI Disk Drive

With thanks.

Sent via Deja.com
http://www.deja.com/

2. XFree with S3, dont work correct on my card.

3. SSA disks - pdisk - hdisk mapping

4. load balancing?

5. SSA pdisk to Hdisk mappings

6. Add: How to add a terminal to serial port

7. hdisk / pdisk help ?

8. Wanted: VT-{100,220} validation suite (or facsimile)

9. pdisk versus hdisk ???

10. Matrox Mystique ands X.

11. how to get pdisk to open/format hda on PB G3?

12. HFS to A/UX can't find name of SCSI drive for pdisk

13. pdisk question: Is changing 'Apple_Free' to 'Apple_UNIX_SVR2' destructive ?