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RE: Kernel file system support under RHEL



Thanks, John, for your speedy response.

Under RHEL 4, sda and sbb do show 4TB each with "fdisk -l", as that
should be.
I don't see sdc and sdd as expected.

Having checked RHEL configuration notes again
(http://www.redhat.com/software/rhel/configuration/), 
I am aware RHEL 3 supports only 1TB file system.
So I am not holding too much hope of seeing the support of 4TB under
RHEL 3.

I can of course rebuild the RAID into smaller chunks, but trust Red Hat
is usually good
at what they state in their specifications, so it could well be
something needed to enable this.

Peter

-----Original Message-----
From: redhat-list-bounces redhat com
[mailto:redhat-list-bounces redhat com] On Behalf Of John O'Loughlin
Sent: 06 June 2005 15:52
To: General Red Hat Linux discussion list
Subject: Re: Kernel file system support under RHEL


Only a possibility but it could be a LUN problem.
maybe you should check to see (on the raid arrays) if the logical drives
have been partitioned and so you should have CH X ID X LUN 0 and LUN 1
and so on. In which case you will have an sdc and sdd etc.

If this is the case and the kernel can't see them (check /var/log/dmesg)
then look at the raid controller and how it handles LUNS. You may also
need to add a line to /etc/modules.conf something like scsi options
max_mod_luns=128 (check this) and then mkinitrd for a new randisk for
the kernel.

John

On Mon 06 Jun 2005 at 15:40, Chiu, PCM (Peter) (P C M Chiu rl ac uk)
wrote:
> 
> We have just recently acquired a few 24 x 400GB SATA servers with 3Com

> 9500S-12 controllers.  The 24 drives are configured into 2 x Raid 5 
> sets with the 9500S controllers, so each RAID set should have a 
> capacity of 4TB.
> 
> Under RHEL AS 3 update 3, the RAIDs are recognised as sda and sdb 
> devices with 2TB capacity each, as opposed to 4.
> 
> If I then mount RHEL AS 4, "fdisk -l" shows sda and sdb being 4TB 
> each, but mke2fs -j /dev/sda or sdb will only make a 1.8GB file system

> on each device.
> (1.8GB is not a typing mistake.)
> 
> I tried to check the kernel with make menuconfig, but I cannot find a 
> suitable option to specify a larger file system.
> 
> Is this an oversight or a bug?
> The feature page on RedHat clearly states the support of 8TB under
RHEL
> AS 4.
> Did try to check RedHat knowledge database and bugzilla but cannot
> locate any reference.
> 
> By the way, the processors are dual AMD 248 with 4GB RAM, and I did 
> select the x86-64 versions of the RHEL.
> 
> Any suggestion?
> 
> Thanks.
> 
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