Intel ICH9R Raid5 supported?

[Hall, Eric R]

Daniel -

Keep in mind that dm-raid4-5 is still considered 'experimental.'

Raid5 would work fine in a home environment as long as you do not plan on rebuilding after a failure [at the moment].  Since the dm-raid4-5 patch is still considered experimental, you should weight your risks of data loss.

I have tested Heinz's dm-raid4-5 patch on several ICH systems and have had good success with it; even after pulling a drive out to simulate a failure.  If a failure would occur, you would have the opportunity to back-up the data before the set completely failed.

Raid5 rebuild functionality isn't quite here yet.  But it will be!  Everyone is still working hard to update dmraid to rebuild failed sets.

- Eric


>-----Original Message-----
>From: ataraid-list-bounces at redhat.com [mailto:ataraid-list-
>bounces at redhat.com] On Behalf Of Daniel Guzmán
>Sent: Monday, January 28, 2008 9:47 AM
>To: ATARAID
>Subject: Re: Intel ICH9R Raid5 supported?
>
>Brian, thank you very much for your response.
>
>Since this patch is Alpha (experimental) software, how reliable is it for a
>home environment?
>Is development status enough for being reasonably safe from data lost?
>Regards.
>
>
>2008/1/27, Wood, Brian J <brian.j.wood at intel.com>:
>
>	Raid 5 is supported, but not in the base kernel as of yet (it's still
>experimental). You'll have to get the patch from Heinz Mauelshagen's
>website (http://people.redhat.com/heinzm/) and rebuild the kernel. Then you
>will be able to activate your raid 5 volume's.
>
>
>
>
>
>
>
>________________________________
>
>
>	From: ataraid-list-bounces at redhat.com [mailto:ataraid-list-
>bounces at redhat.com] On Behalf Of Daniel Guzmán
>	Sent: Sunday, January 27, 2008 9:55 AM
>	To: ataraid-list at redhat.com
>	Subject: Intel ICH9R Raid5 supported?
>
>
>
>	Chipsets: Intel P35 and ICH9R
>	Disks: 4x320 GB
>	Arrays: 1xRAID5 with 4 disks, 1xRAID0 with 4 disks
>	dmraid: dmraid 1.0.0.rc13-2ubuntu5 (Kubuntu 7.10 package)
>
>	Issue: My RAID0 is visible, but RAID5 not. Is ICH9R RAID5 supported?
>
>	I can not find any confirmation about that issue neither in the
>README, nor the CHANGELOG, nor TODO file, nor mailing-list, etc.
>
>	If not supported, will be supported in future?
>
>	Thanks.
>
>
>