RE: [Nolug] NAS

Hi Shane.

For small applications, consider Raid 1. It's cheaper, only two drives, even
though the cost per byte is higher. It's also faster than Raid 5.

John

    John Souvestre - New Orleans LA

  _____

From: owner-nolug@stoney.kellynet.org [mailto:owner-nolug@stoney.kellynet.org]
On Behalf Of Shane Russo
Sent: Saturday, April 10, 2010 4:47 PM
To: nolug@nolug.org
Subject: Re: [Nolug] NAS

I have to agree. For a high availability enviroment server then yes raid 5 is
way to slow. But for me just as a home file server raid 5 is way more economical
than getting 4 drives and 2/3 the capacity with a raid 10.

Thanks,

Shane Russo

On Sat, Apr 10, 2010 at 4:00 PM, Jeremy Sliwinski (mailing list account)
<listbox@unix-boy.com> wrote:

On 4/10/2010 2:14 PM, Chris Jones wrote:

Well, there's no such thing as raid10 with 2 drives. You need at least
4 drives for raid10. With 2 drives it would be raid1. Or raid0, but
only a fool would put important data on a raid0. ;) raid0 is best for
use as a temporary place for data processing. Raid5 is the best of both
worlds, and is the most cost effective.

It depends. We're having to purchase a SAN DAE that is capable of RAID 10 for
a new project we are working on now. The problem we had with RAID 5 was that
we have so much concurrent IO on both the read AND write side, RAID 5 was THE
bottle neck. After talking to the vendors, the all recommended RAID 10.

For ordinary data, like your file server that Joe and Jane are using to store
their documents and photos, yeah RAID 5 is ok. If you are running a large
Exchange cluster (yes, I know, Linux list, but I run it all), RAID 5 can cause
issues. Desktop and server virtualization do so-so on RAID 5, but the
recommendations I'm starting to see are for RAID 10 in those setups.

However, I think in context of this topic, RAID 5 would probably suit the
original poster just fine. I doubt he has 50-100 instances of a VM hitting his
storage device.

J
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Received on 04/10/10