RE: [CentOS] Raid Cards

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On Thu, 2006-06-08 at 14:15 -0400, Drew Weaver wrote:
> Software RAID has failed us so many times in the past that I
> would never recommend it to anyone. Things like: the raid breaking for
> no reason and the server continually rebuilding over and over, and once
> a drive does finally die the other drive wasn't being mirrored properly
> (or wouldn't boot even though we manually sync'd the bootloaders as
> suggested.).
> 
>  It has been nothing but a hassle, so if you need reliable data
> you need to find a card that works for you, I'm not sure why people are
> so ready to suggest software raid when the fact is its pretty
> unreliable.

I've had software raid work very well for years, but mostly on
scsi controllers.  I've even hotswapped replacement drives and
rebuilt without shutting down.  I like it because it's not unreliable
on my hardware and since I use RAID1 I can recover data from
any single disk by connecting it to any compatible controller. Or
if a motherboard dies I can shove the drives in a spare chassis
without worrying about whether it has exactly the same controller
and raid configuration.

If you have a problem booting, you can boot the 1st install CD
in rescue mode and fix the grub setup - and 'cat /proc/mdstat' will
always show you if the mirrors are active.

I have heard of problems on SATA drives where errors aren't passed
up to the md layer correctly but I don't have any experience with
that myself.  I'd probably go with a 3ware controller for SATA.

-- 
  Les Mikesell
    lesmikesell@xxxxxxxxx


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