dynamic resize of LUNs

[Barry Brimer]

resize2fs is the tool that you would use to expand the filesystem. 
First, we need to expand the partition that the filesystem lives on.

WARNING:  I have done exactly this with 100% success on multiple RHEL 4 
machines.  I have never tried it on RHEL 5.

0.  BACK UP YOUR DATA!!!

1.  Run 'fdisk -l' and note the starting and ending of your partition.  I 
will assume that the space being given to you appears at the end of your 
existing partition and that this partition is the last partition on the 
disk.

2.  Using fdisk, delete the partition.  Create a new partition that 
begins in the same place, but ends at the end of the newly created space. 
Use 'w' to write your changes, and save them.  Run partprobe if necessary 
to force the kernel to re-read the partition table if it complains that 
the kernel uses the old partition table.

3.  Use resize2fs to expand your filesystem (while online) to take up the 
entire partition.

Hope this helps.

Barry

On Tue, 9 Oct 2007, Holder, Bill wrote:

>
>
> It's a single ext3 partition with no LVM on a RHEL 5 server. Don't ask
> why I was forced to not use LVM, it's a very Dilbert-esque story.
>
>
> -----Original Message-----
> From: redhat-sysadmin-list-bounces at redhat.com
> [mailto:redhat-sysadmin-list-bounces at redhat.com] On Behalf Of Barry
> Brimer
> Sent: Tuesday, 9 October 2007 1:10 PM
> To: redhat-sysadmin-list at redhat.com
> Subject: Re: dynamic resize of LUNs
>
>
>
> On Tue, 9 Oct 2007, Holder, Bill wrote:
>
>> Hi all,
>>
>>    I'm hoping someone might be able to help me get this to work
>> properly...
>>
>>    Linux server with Qlogic HBA cards, has a 50gig LUN presented to
>> it, with a single ext3 filesystem.
>>
>>    SAN admin has added another 50 gig to the LUN, and the server sees
>> a 100 gig LUN.
>>
>>    Problem is, the filesystem is now corrupt.
>>
>>    I've tried rebuilding the devices and letting kpartx do it's thing,
>
>> but the existing filesystem always dies.
>>
>>
>>    Anyone know a good way to get this working, or am I screwed?
>
> What version of RHEL are you using?  What filesystem is on it ext2/3,
> xfs, gfs, vxfs .. etc?  Are you using any LVM?
>
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