CentOS - Mar 2005 - Re: What''s the biggest software raid partition?

On Wed, 16 Mar 2005 at 12:00pm, Ho Chaw Ming wrote
> I just installed CentOS 3.3 (Will try 4 later). I have 10 x 250GB harddisk
> which I build in a Raid-5 Config.
>
*snip*
> Is there a size limitation to the biggest software raid on a default kernel
> installation?
Yes -- 2TB with CentOS 3.  CentOS 4 will get you past that limitation.

--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University

Is it correct that the maximum number of drives you can put on a single
RAID5 array is 8 drives?
If this is the case then you will need to make two separate RAID5 arrays,
since you have 10 drives.
I recently setup a 16x300GB RAID, but had to setup two separate arrays.
The card I used was an Adaptec 16channel card.

Kind Regards,
Imran Boota


-----Original Message-----
From: centos-bounces@caosity.org [mailto:centos-bounces@caosity.org] On
Behalf Of Joshua Baker-LePain
Sent: 16 March 2005 15:37
To: centos@caosity.org
Cc: Ho Chaw Ming
Subject: [Centos] Re: What''s the biggest software raid partition?

On Wed, 16 Mar 2005 at 12:00pm, Ho Chaw Ming wrote
> I just installed CentOS 3.3 (Will try 4 later). I have 10 x 250GB
> harddisk which I build in a Raid-5 Config.
>
*snip*
> Is there a size limitation to the biggest software raid on a default
> kernel installation?
Yes -- 2TB with CentOS 3.  CentOS 4 will get you past that limitation.

--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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Imran wrote:
>Is it correct that the maximum number of drives you can put on a single
>RAID5 array is 8 drives?
>
>
No, that is not the case, though it may be a hardware/firmware
limitation of your particular RAID card.
>If this is the case then you will need to make two separate RAID5 arrays,
>since you have 10 drives.
>I recently setup a 16x300GB RAID, but had to setup two separate arrays.
>The card I used was an Adaptec 16channel card.
>
>
That''s certainly not a Linux-imposed limitation.  Adaptec driver
support
for Linux has never been stellar (and actually was horrible in the early
days).

Cheers,

C