Questions about bootable raid 1 using atacontrol.

2003-06-25 Thread George Hartzell

Hi,

I have a server running 4.8 on a single disk.  I'd like to set it up
to mirror and be bootable.  Killer performance isn't critical, but
maximal flexibility to frankenstein it together from spare parts is.

So, I'm shying away from hardware raids, and even the pseudo-hardware
raids.

I'd like to just stuff two ata drives in there and use atacontrol to
set them up.

I gather that I can't just cram a second disk into the existing
system, rather I'll have to do dumps to somewhere, set up a raid,
disklabel/newfs, then restore the dumps onto the raid.  Is that an
accurate summary.

Once it's running, how do I recover if/when a disk pukes.  It sounds
like atacontrol's rebuild command only works w/ real controllers.
Do I need to boot from a cd and then dd onto the new disk, or???  Do I
need to add the new disk into the raid somehow?

Thanks!

g.


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Re: Questions about bootable raid 1 using atacontrol.

2003-06-25 Thread Joshua Oreman
On Wed, Jun 25, 2003 at 08:04:38PM -0700 or thereabouts, George Hartzell wrote:
 
 Hi,
 
 I have a server running 4.8 on a single disk.  I'd like to set it up
 to mirror and be bootable.  Killer performance isn't critical, but
 maximal flexibility to frankenstein it together from spare parts is.
 
 So, I'm shying away from hardware raids, and even the pseudo-hardware
 raids.
 
 I'd like to just stuff two ata drives in there and use atacontrol to
 set them up.
 
 I gather that I can't just cram a second disk into the existing
 system, rather I'll have to do dumps to somewhere, set up a raid,
 disklabel/newfs, then restore the dumps onto the raid.  Is that an
 accurate summary.

AFAIK, that is correct.

 
 Once it's running, how do I recover if/when a disk pukes.  It sounds
 like atacontrol's rebuild command only works w/ real controllers.
 Do I need to boot from a cd and then dd onto the new disk, or???  Do I
 need to add the new disk into the raid somehow?

I think Vinum or RAIDframe would be better if you want software RAID.
Both support booting from the RAID.

-- Josh

 
 Thanks!
 
 g.
 
 
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Re: Questions about bootable raid 1 using atacontrol.

2003-06-25 Thread George Hartzell
Joshua Oreman writes:
  On Wed, Jun 25, 2003 at 08:04:38PM -0700 or thereabouts, George Hartzell wrote: 
  [...]
   
   Once it's running, how do I recover if/when a disk pukes.  It sounds
   like atacontrol's rebuild command only works w/ real controllers.
   Do I need to boot from a cd and then dd onto the new disk, or???  Do I
   need to add the new disk into the raid somehow?
  
  I think Vinum or RAIDframe would be better if you want software RAID.
  Both support booting from the RAID.

I don't think RAIDframe is supported in Stable, is it?

Is there a particular advantage to Vinum over the atacontrol stuff?

g.


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Re: Questions about bootable raid 1 using atacontrol.

2003-06-25 Thread Joshua Oreman
On Wed, Jun 25, 2003 at 09:02:22PM -0700 or thereabouts, George Hartzell wrote:
 Joshua Oreman writes:
   On Wed, Jun 25, 2003 at 08:04:38PM -0700 or thereabouts, George Hartzell wrote: 
   [...]

Once it's running, how do I recover if/when a disk pukes.  It sounds
like atacontrol's rebuild command only works w/ real controllers.
Do I need to boot from a cd and then dd onto the new disk, or???  Do I
need to add the new disk into the raid somehow?
   
   I think Vinum or RAIDframe would be better if you want software RAID.
   Both support booting from the RAID.
 
 I don't think RAIDframe is supported in Stable, is it?
 
 Is there a particular advantage to Vinum over the atacontrol stuff?

It's more extensible, has loads more features, is better supported,
will rebuild your RAID automatically if need be, you can boot from it, ...

-- Josh

 
 g.
 
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