[K12OSN] Knowledge turned crisis

David H. Barr david at okgoodwill.org
Thu Dec 2 22:09:26 UTC 2004

If you're going to stick with EIDE, you don't necessarily need more than one card;  Typically for low-end setups I set one hdd as master0, and a dvd/cdrw as slave0.  Then 3 drives go in, one as master1, master2, master3 -- and voila!  Cheapest raid5 w/hotspare I know how to get ahold of.  Essentially you want to make sure they have their own CHANNEL, not necessarily their own controller.

As long as one is doing software raid, though, what's the problem with SATA drives?  A generic controller is less than $30, and you can get 80GB models for dirt cheap.


Around Thursday, December 02, 2004 3:51 PM,
Les Mikesell (mailto:les at futuresource.com) wrote:
>> From: Liam Marshall
>> anything wrong with 4 - 80 GB 7200rpm EIDE drives with 8Mb
>> cache running on a raid controller(as yet to be determined)
>> in a configuration like 1
>> + 0 or 0 + 1?  This gets me effectively 80GB capacity and redundancy
>> with the ability to withstand 2 drives dying, right?
> With most cheap IDE controllers you are better off running Linux
> software 
> raid than the controller version which is mostly software anyway.  You
> really want to keep each drive on it's own controller so you'll need
> some kind of extra card to handle 4 drives. Note that you can't lose
> any two drives at once - you are only covered if you lose one of the
> drives with a still-working mirror.
>> this would get me, correct me if I am wrong, both redundancy and some
>> performance increase, yes?
> Doing raid0 may give a performance increase, raid1 gives redundancy. 
> You 
> can do either or both.  Doing 2 separate raid1 mirrors would mean
> that you 
> could recover the data from any single drive if you plug it into
> another 
> machine.  That is difficult or impossible with other raid schemes but
> if you 
> have some other backup may not matter to you.
> ---
>   Les Mikesell
>     les at futuresource.com
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