Disk partitions and LVM limits

[Olt, Joseph]

Hello Peter,

 

According to centos.org, you should be able to create a partition that
size: http://www.centos.org/product.html.  RedHat had an ext3 filesystem
limit of 2TB until RHEL4.  I know you want to make the space usable, but
do you really need a single filesystem that is that large?  Generally,
you don't see filesystems larger then 2TB without using a special
filesystem that will scale across multiple partitions and you have a
specific need you are solving.  Just remember that if you create that
large of a filesystem and it gets corrupt, all of that data is lost.
There is also a greater consideration for backup and restore.  If you
have smaller partitions and one partitions backup job fails, you still
have the others.  If possible, you may want to consider creating smaller
filesystems and mount them where you need the space.

 

Regards,

Joseph

 

________________________________

From: redhat-sysadmin-list-bounces at redhat.com
[mailto:redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Vinod
Kumar
Sent: Monday, February 11, 2008 8:37 PM
To: redhat-sysadmin-list at redhat.com
Subject: Re: Disk partitions and LVM limits

 

Hi Peter,

 

You can use parted (or gparted) to create partitions greater than 2TB.  

 

Regards,

Vinod

 

On 2/12/08, Jonathan Klay <Jonathan.Klay at noaa.gov> wrote: 

I found this a bit difficult, but look at Redhat knowledge base article
11461.  Seems you have to guess at the max size, as it doesn't tell you
what it is (it will be something less than 5.4TB!), so I created and
removed as I zeroed in on it best I could.

Peter Blajev wrote:

> Date: Fri, 8 Feb 2008 11:01:21 -0800
> From: Peter Blajev <pblajev at ucsd.edu>
> Subject: Disk partitions and LVM limits
> To: redhat-sysadmin-list at redhat.com
> Message-ID: <200802081101.21774.pblajev at ucsd.edu>
> Content-Type: text/plain;  charset="us-ascii"
>
> Hi,
>
> I've got a DAS DELL MD1000 with a bunch of SATA drives in RAID 5
configuration
> with total space of 5.4TB. This box is attached to a CentOS5 system
(kernel
> 2.6.18-53.1.6.el5).
>
> Any idea how to make this space usable?
> Is there a limit how big a partition can be? What is the work around?
> Is there a limit how big a file system ca be?
>
> I've tried to partition it but no matter how bug partition I create
fdisk
> spits out these messages on the console:
> ---
> sdb: very big device. try to use READ CAPACITY(16).
> SCSI device sdb: 10248519680 512-byte hdwr sectors (5247242 MB)
> sdb: Write Protect is off
> ---
>
> I decided to not partition the drive and use LVM but the physical
volume
> stopped at 2TB.
>
> So, right now I can't use LVM because of this 2TB limit and I'm not
sure if I
> partition the drive how good these partitions are because of the the
message
> from fdisk.
>
> Any help or idea is highly appreciated.
>
> Thank you
> Peter
>
>
>
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--

Jonathan Klay     <+>
System Administrator


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