[mythtv-users] question about RAID

[Graham Mitchell]

There's no technical reason that should stop  you expanding a raid-5
array  - do it at work all the time with hardware scsi raid controllers,
tho the mdadm might not allow you to do it. I believe some of the
broadcom based raid cards allow OCE.

It's also one reason to use LVM on top of raid... add 3 more disks in a
new raid array, add it to the volume group, and expand the file system
onto te new space.

This article is a good read
http://home.gagme.com/greg/linux/raid-lvm.php

G



-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of
chris at cpr.homelinux.net
Sent: Tuesday, January 10, 2006 2:33 AM
To: Discussion about mythtv
Subject: Re: [mythtv-users] question about RAID

On Mon, Jan 09, 2006 at 08:53:31PM -0500, Steve Adeff wrote:
> If I can add drives in after initial creation, I could add in more of
my 
> 320gig drives I have with other media on them, increase write speed a
bit and 
> not worry about losing the other data as well.

You can't increase the number of active devices in a RAID-5 (mdadm) 
array because the distribution of data and parity is set when the 
array is first created.  To increase the capacity of the array you 
would need to increase the capacity of all of the constituent 
devices, "grow" the array to take up the extra space and then resize 
the hosted filesystem.

-- 
"When fascism comes to America, it will be wrapped in the flag and 
carrying the cross." - Sinclair Lewis (1935)
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