Storage space partition
Bob McClure Jr
bob at bobcatos.com
Fri Apr 14 20:02:41 UTC 2006
On Fri, Apr 14, 2006 at 03:46:03PM -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 3:43 PM
> To: Getting started with Red Hat Linux
> Subject: Re: Storage space partition
>
> On Fri, Apr 14, 2006 at 03:33:47PM -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 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.
> >
> > <snippage>
> >
> > 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
>
> Did you run "fdisk -l"? I wanted to see if /dev/sdb or /dev/sdc
> showed up. If either sdb or sdc are synonyms for emcpowera, it would
> be better to use it/them just because it's more customary and will
> result in fewer surprises.
>
> Cheers,
> --
> Bob McClure, Jr. Bobcat Open Systems, Inc.
> bob at bobcatos.com http://www.bobcatos.com
> The best things in life aren't things.
>
> _______________________________________________
>
> Here is the output of fdisk -l
>
> Disk /dev/sda: 36.3 GB, 36364615680 bytes
> 64 heads, 32 sectors/track, 34680 cylinders
> Units = cylinders of 2048 * 512 = 1048576 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sda1 1 31 31728 de Dell Utility
> /dev/sda2 32 7748 7902208 83 Linux
> /dev/sda3 * 7749 7848 102400 83 Linux
> /dev/sda4 7849 34680 27475968 5 Extended
> /dev/sda5 7849 8872 1048560 83 Linux
> /dev/sda6 8873 10920 2097136 82 Linux swap
> /dev/sda7 10921 14925 4101104 83 Linux
> /dev/sda8 14926 19915 5109744 83 Linux
> /dev/sda9 19916 34630 15068144 83 Linux
>
> Disk /dev/sdb: 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/sdb1 1 85113 683670141 8e Linux LVM
>
> Disk /dev/sdc: 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/sdc1 1 85113 683670141 8e Linux LVM
>
> 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
>
>
> Cheers ../Murli
Okay, I somewhat expected that. Your SAN appears to be showing your
machine multiple variants of the same device. I don't know what your
SAN hardware is, but my sole experience is with HP's MSA-1500 with
MSA-20 and MSA-30 shelves. On it, we had to go into "Selective
Storage Presentation" to keep linux from seeing 16 or more devices,
most of which were bogus. Otherwise, every time you run "vgscan" or
anything related, it's going to see multiple instances of the real
virtual (?) disk.
Once you get that sorted out, I'd run pvcreate on the partition,
/dev/sdb1, rather than the whole drive /dev/sdb.
Cheers,
--
Bob McClure, Jr. Bobcat Open Systems, Inc.
bob at bobcatos.com http://www.bobcatos.com
The best things in life aren't things.
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