raid controller recommendation

[Chris Debono]

Hi 

As far as I know, promise store some of its config somewhere on the hard
disk (most probably in the boot sector). I noticed this when I set up a
mirror with 2 hard disks on one controller and installed RH9. I swapped the
controller with another one which was unconfigured and on power up it
recognized the drivers as a mirror automatically so I assume it is writing
something on the disks. The model I used was the TX2PRO. 

What I noticed is that if 1 drive fails, the system degradation is so high
that it becomes unusable and you have to power down and remove 1 drive to
continue working.

Regards

Chris



-----Original Message-----
From: fedora-list-admin at redhat.com [mailto:fedora-list-admin at redhat.com] On
Behalf Of McKeever Chris
Sent: 12 December 2003 08:03
To: fedora-list at redhat.com
Subject: Re: raid controller recommendation

Mike, sorry I am taking this off list - if you want we can bring it back on
for the education of all, but it seems to tangent from 
discussion..anyway

I am planning on implementing a promise 6 channel raid 5 IDE card and you
mentioned " Promise puts the drive hashes on the controller".  I am 
not sure I understand this, or what the ramifications mean.  At the least, i
want to be able to understand what I may be getting myself into, if 
not try to minimize any painting myself into a corner...

Any info would be appreciated..

Thanks

-------------------------------------------
Chris McKeever
If you want to reply directly to me, please use
cgmckeever--at--prupref---dot---com
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On Thu, 11 Dec 2003 15:09 , mike webster <mwebster at intercosmos.net> sent:

>I've been forced to use IDE RAID due to cost and capacity.
>I'm honestly not too keen on the whole IDE RAID thing, myself.  Promise
>puts the drive hashes on the controller, which means that if your
>controller dies - you're screwed.  You can't replace the controller and
>get your data back.  Its basically software raid, but with a controller
>card.  If you're doing anything mission critical, I'd really recommend
>going with a "real" hardware RAID solution.  Accusys makes a nice
>external RAID controller (SCSI), as does Infortrend - but they don't
>come cheap.  If you're stuck with IDE, Promise makes their RM4000,
>RM8000 and RM15000 external arrays which, in my opinion, are really
>cool.  Again, they aren't cheap, but really, really nice.  I'm currently
>using several of these.
>
>
>Mike.
>
>
>
>
>On Thu, 2003-12-11 at 15:00, Hans Müller wrote:
>> Am Donnerstag 11 Dezember 2003 21:24 schrieb mike webster:
>> > If you're looking for SCSI, go with adaptec.  For a simple ide solution
>> > with two drives I'd recommend the Promise TX-2000 card.  I've written
up
>> > a howto: for the promise card if you'd like the link.
>> >
>> > Mike.
>> >
>> > On Thu, 2003-12-11 at 14:26, Raymond Norton wrote:
>> > > I have decided to do a hardware raid rather than struggle with the
>> > > software raid. What would be a good, inexpensive controller that can
do
>> > > raid level 1?
>> when you use SCSI  Vortex or Adaptec.
>> when ATA or SATA then use 3ware. 3ware contolleres are seen by linux as a
real 
>> raid conroller. The promise contoller somtimes show not the raid array
but 
>> the disk. and when then you try to acces disk disk you can destroy your 
>> array.
>> 
>> 
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