Storage space partition

[Nair, Murlidharan T]

-----Original Message-----
From: redhat-install-list-bounces at redhat.com
[mailto:redhat-install-list-bounces at redhat.com] On Behalf Of Bob McClure
Jr
Sent: Friday, April 14, 2006 3:06 PM
To: Getting started with Red Hat Linux
Subject: Re: Storage space partition

On Fri, Apr 14, 2006 at 02:44:35PM -0400, Nair, Murlidharan T wrote:
> 
> 
> -----Original Message-----
> From: redhat-install-list-bounces at redhat.com
> [mailto:redhat-install-list-bounces at redhat.com] On Behalf Of Bob
McClure
> Jr
> Sent: Friday, April 14, 2006 1:17 PM
> To: Getting started with Red Hat Linux
> Subject: Re: Storage space partition
> 
> On Fri, Apr 14, 2006 at 11:46:24AM -0400, Nair, Murlidharan T wrote:
> > 
> > <much snippage>
> > 

> [root at bioinformatics ~]# pvcreate /dev/emcpowera
>   Physical volume "/dev/emcpowera" successfully created
> 
>  [root at bioinformatics ~]# vgcreate bio01VG /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdb
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdc
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdb
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdc
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdb
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdc
> not /dev/emcpowera
>   Volume group "bio01VG" successfully created

Okay, now I'm not sure what is going on.  It is more common for linux
to identify the drives as /dev/sda, /dev/sdb, etc. rather than
/dev/emcpowera.  What might be more useful would be to run

  fdisk -l # That's ell as in list.

and see what drives show up.  Is it possible that /dev/emcpowera is
the physical SAN disk(s) and that /dev/sdb and /dev/sdc are the
virtual disks created by the SAN?  If so, the latter should be
partitioned and pvcreated.

Also note that you created the partition and then ignored it.  Had you
used the partition, it would have been called /dev/emcpowera1 when you
ran pvcreate.

Rick Stevens, feel free to jump in here.  I'm operating from very
recent and limited experience with a SAN.

> [root at bioinformatics ~]# vgdisplay bio01VG
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdb
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdc
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdb
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdc
> not /dev/emcpowera
>   Volume group "bio01VG" doesn't exist
> 
> [root at bioinformatics ~]# vgchange -a y bio01VG
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdb
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdc
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdb
> not /dev/emcpowera
>   Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdc
> not /dev/emcpowera
>   Unable to find volume group "bio01VG"


I just noticed that the partition it created was called emcpowera1. Here
is part of the output
========================================================
Disk /dev/emcpowera: 700.0 GB, 700079669248 bytes
255 heads, 63 sectors/track, 85113 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

         Device Boot      Start         End      Blocks   Id  System
/dev/emcpowera1               1       85113   683670141   8e  Linux LVM

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.
Syncing disks.
========================================================
I assumed that it would create the partition with the same name so when
I did a pvcreate I used 
pvcreate /dev/emcpowera

I am thinking of doing a pvremove I ran the test here is what I got
==================================================================
[root at bioinformatics /]# pvremove -t -v /dev/emcpowera
  Test mode: Metadata will NOT be updated.
  /dev/cdrom: open failed: Read-only file system
  Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdb
not /dev/emcpowera
  Found duplicate PV XKollgX4GsBzbFyJsK13JS62S3P4b0Vr: using /dev/sdc
not /dev/emcpowera
  Labels on physical volume "/dev/emcpowera" successfully wiped
    Test mode: Wiping internal cach
==================================================================
Then I can start back with pvcreate correct?  Also will there be any
consequences of running vgcreate on /dev/emcpowera that used dev/sbd ?
If so how can I fix it?

Thanks for your time ../Murli