RE: Dynamically increase/reduce hardware raid partition?
From: Michael Bellears (MBellears_at_staff.datafx.com.au)
Date: 04/14/04
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Date: Wed, 14 Apr 2004 15:36:43 +1000 To: "Debian User" <debian-user@lists.debian.org>
>
> On Wed, 14 Apr 2004, Michael Bellears wrote:
>
> > I have just installed Debian 3 on a Smart Array 6400 (4
> disks (146.8G
> > each) Raid 5) - This gives me a data partition of 409G.
>
> that's pretty bad ... i'd have expected somewhere around 3x
> 146gb of usable space
That is my "data" partition - I have other partitions taking up the
remaining space.
>
> when you formatted the disks... did you use -m 1 or some
> other non-default "reserved space" on these giant disks
No - Standard install with cfdisk (So whatever it uses)
>
> > If I add an additional 146.8G drive, and update the
> array(Raid BIOS),
>
> if you changed the "partition" ( raid bios )... you lost all data
> - partitions are not dynamically resizable to add new disks
> to the array
I added the addiditional HD to the dynamic array (HP top tools) - Giving
a total of ~520G (As reported in HP Tool)
>
> > the changes are not reflected when in Debian (i.e. It still
> only sees
> > a 409G partition, not ~520G)
> >
> > Is there anyway around this? Or everytime we add an
> additional drive,
> > we must create a new array, and add it to fstab?
>
> you need to use a "resizable" filesystem type ( reiserfs or
> jfs or xfs )
> - if forgot which fs are dynamically resizable to allow the
> inclusion of the new disk into its existing partitions
> ( allows you to make 256MB / to be 512MB / or
> something like it )
I am running ReiserFS - Is there anything I need to do once I have
rebooted with the additional drive to have it "see" the additional
space?
>
> growing an existing raid array on the fly is a "bad thing"
> and i hope you have very good backups to restore the entire array
The server has a capacity of 16 drives - We currently only have
5(Couldn't talk management into purchasing 16x$1000 drives striaght up!)
- I wanted to be able to "grow" the size of the array when demand
dicates(i.e. once we have used ~450G, I would like to add an extra two
146.8 G drives to increase our data partition's size)..
Regards,
MB
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