Re: CERC 1.5/6ch upgrade issues

Mon, 17 Aug 2009 14:12:17 -0700

Sorry, I should have provided more details. When using the CERC BIOS to create or manage an array, it announces that there are no disks detected. However, if I scan for the disks or let the BIOS do it's disk detection at boot, it reports all the disks as properly attached and talking.
Whatever problem there is seems to be at the controller-can't-handle- these-disks level, not at the create-an-array level. 

H

On Aug 17, 2009, at 4:57 PM, Seth Mos wrote:


I'm trying to update a set of volumes on a PE1800 from 500gb disks to
1.5tb disks, and my CERC controller won't let the drives show up to
the linux kernel (Centos 5.3).



Most likely a 2TB limitation (48bit lba) on a volume set on the host

controller. This is valid for most older lsi and adaptec controllers  
of

the era.


Try making a mirror and see if that works for you. Might be able to  
use

software raid to create a stripe of mirrors. That or LVM.


I have a LSI 300-8x that can't do > 2TB volumes. I suppose that  
provides a

strategy to market new controllers.


Pretty much all controllers have a 48bit lba limitation on the  
physical

disks. Not sure if there are already controllers that support physical
disks with 64bit lbas

Regards,

Seth


--

Never interrupt your enemy when he is making a mistake
    Napoleon Bonaparte

Howard Powell
Computer Support Technician
Astronomy Department, UVa






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