-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Joshua Baker-LePain Sent: Wednesday, July 12, 2006 2:36 PM To: CentOS mailing list Subject: RE: [CentOS] Speaking of 3Ware/RAID/SATA/9550SX...
On Wed, 12 Jul 2006 at 2:31pm, Seth Bardash wrote
Using the 3ware 9550 or 9500 series controllers for any array
larger
than 2 TB requires that you set up the controller to use "Auto-Carving", set up and build the kernel to enable multiple
LUNs,
rebuild initrd, reboot, and fdisk / mkfs the unused areas.
This forces the controller to "Auto-Carve" multiple 2 TB devices
on
different LUNS of the same SCSI ID. You also need to enable multiple LUN support in the kernel when
you
build a new kernel - which is required.
This is absolutely *not* required. RHEL4 (and thus CentOS-4) explicitly support devices and filesystems up to 8TiB. As I mentioned before, however, one must use gpt disklabels on any device larger than 2TiB. And this precludes one from booting from such a large device, as neither grub nor lilo understand gpt disk labels.
-- Joshua Baker-LePain Department of Biomedical Engineering Duke University
Mr. Joshua Baker-LePain,
You are absolutely correct - BUT I answered under the assumption that the original poster wants to boot from this large device and the only way to do that is as I explained.
You wrote " And this precludes one from booting from such a large device, as neither grub nor lilo understand gpt disk labels."
Exactly. So, if one wants to boot using the standard grub function AND wants to install Centos with minimal changes, the sequence I describe works without any additional controllers or disks.
Adding mirrored boot disks with an 8006-2 as mentioned by someone else is another way to go to get around the 2 TB BOOT limitation. I stress that this is a BOOT limitation.
Seth Bardash
Integrated Solutions and Systems 1510 Old North Gate Road Colorado Springs, CO 80921
719-495-5866 719-495-5870 Fax 719-337-4779 Cell
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