Re: [gentoo-user] dmraid, mdraid, lvm, btrfs, what?

[Michael Mol]

On Tue, Nov 29, 2011 at 2:34 PM, Mark Knecht <markknecht@×××××.com> wrote:
> On Tue, Nov 29, 2011 at 11:02 AM, Jarry <mr.jarry@×××××.com> wrote:
>> On 29-Nov-11 17:53, Michael Mol wrote:
>>>> 1) First lesson - not all hard drives make good RAID hard drives.
>>> What makes a good RAID unit, and what makes a terrible RAID unit?
>> Some hard-drives are not suitable for raid at all. There
>> are many reasons for that, one example is error-recovery.
>> Check wiki for more info:
>>
>> http://en.wikipedia.org/wiki/Time-Limited_Error_Recovery
>>
>> In the first place, I would not recommend those "eco" and
>> "green" versions for raid at all. They have some saving
>> mechanisms which tend to activate at wrong time and cause
>> problems for raid-controllers (be it SW or HW). I'd say
>> it is worth to pay a few bucks more for enterprise-class
>> 24/7 (or special "raid-edition") drives.
>>
>> Jarry
>
> This is a good representation of what happened on my first pass with
> RAID. I bought a bunch of WD 1TB Green drives. They work fine, but
> when I put them together in even a RAID1they had very long wait times
> in 'top' and the speed was horrible.
>
> That's not to say all Green drives do this because they don't. It's
> just hard to say what will work before you buy the drives _unless_ you
> buy RAID edition drives.
>
> In Micheal's case he already has his drives so the will either work or
> they won't. That's one reason I suggested he put together a couple of
> configurations. He's looking at RAID5 & RAID10, which to me makes
> sense with 4 drives. We'll just have to wait and see how they work I
> think.

In this system, I have five Seagate Barracude ES drives.

http://personal.rosettacode.org/smart.txt

Which reminds me, I need to fix the tz settings on that box.
-- 
:wq