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: Thursday, April 13, 2006 11:34 AM
To: Getting started with Red Hat Linux
Subject: Re: Storage space partition

If you please, we prefer bottom posting.  See

http://en.wikipedia.org/wiki/Top-posting

I'll reorder this.

On Thu, Apr 13, 2006 at 11:06:35AM -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: Thursday, April 13, 2006 10:01 AM
> To: Getting started with Red Hat Linux
> Subject: Re: Storage space partition
> 
> On Thu, Apr 13, 2006 at 09:49:24AM -0400, Nair, Murlidharan T wrote:
> > I have just completed the installation of Linux and configured the
> > storage array as RAID5. The total capacity of the storage is about
> > 600Gb. I am trying to decide on the factors that I should consider
> when
> > partitioning it. I only have one server that is connect to my SAN.
> The
> > main fact that I am trying to debate is what if the partition that I
> am
> > using to store my sql data runs out of space, will storing part of
my
> > data on another partition decrease the performance? In which case is
> it
> > better to just leave it as one large partition?  I would appreciate
> you
> > any comments or suggestions..
> > 
> > Thanks ../Murli
> 
> Make one partition on the SAN, then make it a physical volume for
> LVM.  Then divide it up into logical volumes.  Logical volumes are
> easily resized.  It also has a snapshot capability which helps for
> backups.
> 
> Cheers,
> -- 
> Bob McClure, Jr.
> _______________________________________________
> 
> The way I have it now is one virtual disk of size 652GB. Is this
> equivalent to what you call LVM ?

No.  Your "virtual disk" is the way your SAN presents a "physical
disk" to the world.  Establish one partition on that.  (You don't
really have to do that when using LVM, but this extends to the more
general case.)  Then establish LVM on that.

> When logical volumes are resized, I
> presume it does not affect the already existing data in the volume
being
> resized?

As long as you are making it bigger, no.  After you have resized the
LV, you will still need to resize the filesystem with (assuming ext2/3
fs) resize2fs.  If making it smaller, resize the filesystem first,
then reduce the size of the LV.  Back up your data in case you make a
mistake.  "man resize2fs" and "man lvresize" for more info.

 Can you point to a source where I can read a little more about
> this? I am doing this for the first time. 

http://en.tldp.org/HOWTO/LVM-HOWTO/index.html

> Thanks for your comments...
> Cheers ../Murli

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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If I need to add additional disks and combine the space from those new
disks to the LVs that I had previously created, can that be done easily?

Does creating the virtual disk format the disk as well? Or do I have to
do that separately? 
Cheers ../Murli