[ale] They say drives fail in pairs...

[Ed Cashin]

ZFS has a few mechanisms for redundancy, including a RAID 5-ish "raidz" and
a RAID 10-ish stripe-of-mirrors scheme, but it also has checksums all over
the place, multiple data copies, more flexibility, and on and on.  It's
complex but very neato.

On Tue, Jan 3, 2012 at 4:52 PM, Lightner, Jeff <JLightner at water.com> wrote:

> That confuses me.  Does ZFS have built in redundancy of some sort that
> would obviate the need for the underlying storage to be hardware RAID?  Or
> are you saying you'd use ZFS rather than Software RAID?
>
>
>
>
>
> -----Original Message-----
> From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of
> Michael Trausch
> Sent: Tuesday, January 03, 2012 3:42 PM
> To: Atlanta Linux Enthusiasts
> Subject: Re: [ale] They say drives fail in pairs...
>
> On 01/03/2012 03:39 PM, Michael Trausch wrote:
> > I am trying to figure out what I am going to do next with this setup.  I
> > want to move the bulk of the data out of the office and onto a setup
> > that can sustain about 50/50 read/write.  (It is more or less even; the
> > humans mostly read, and automatic processes mostly write, a lot.)
>
> Actually, I am pretty sure that I am absolutely not going to use RAID.
> I'm probably going to use ZFS on FreeBSD, or btrfs on Linux (if it ever
> grows up and handles multiple devices without crapping all over you)
> instead of RAID stuff.  Because both btrfs and ZFS can grow and shrink
> dynamically, and they can take care of what amounts to RAID-like
> functionality at the filesystem level, they seem to be much better for
> things where you might be adding space on-demand.  The RAID stuffs are
> very difficult to grow or reshape with time, and the needs of a small
> business with big data storage requirements just don't mesh with RAID
> all that well.
>
>        --- Mike
>
> --
> A man who reasons deliberately, manages it better after studying Logic
> than he could before, if he is sincere about it and has common sense.
>                                   --- Carveth Read, "Logic"
>
>
>
>
>
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-- 
  Ed Cashin <ecashin at noserose.net>
  http://noserose.net/e/
  http://www.coraid.com/
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