[nycbug-talk] was Re: FreeBSD software RAID?
lego at therac25.net
Thu Mar 8 09:11:07 EST 2007
On Thu, 8 Mar 2007, Dan Langille wrote:
/* snip snip */
>> So we have Miles saying (I think) that the RAID3 implementation in
>> FreeBSD is better than the RAID5 implementation, then Steven saying
>> that RAID3 is the redheaded stepchild of disk arrays.
> Andy: The discussions you read about RAID5 and RAID3 where not based
> on the "FreeBSD implementation". They were about RAID in general.
> They were discussing the pros and cons that that particular RAID
> configuration. They were *not* talking about any particular
> implementation of RAID. It is an important point.
> Reading this might help understand the various RAID configurations:
>> I'm beginning to think that software RAID on FreeBSD isn't worth the
>> hassle and a modest investment in a supported RAID card is in order.
>> Is this the real recommendation?
> Nobody said that in what you quoted. They were steering you away
> from RAID-3 and from RAID-5. Personally, I recommend RAID-1
> (mirroring, minimum of 2 disks) or RAID-10 (mirroring and striping,
> minimum of 4 disks).
Great! Thanks for the clarification. I wasn't sure if the FreeBSD
specifics were being discussed or if a general disdain for RAID3 and 5 was
> I have a few servers using RAID: RAID-1, RAID-10, and
> I have nothing running software RAID, but that it not for any
> particular reason. Certainly, for a simple RAID-1, there's not much
> to setting it up on FreeBSD. See what Dru did:
Also a good article!
I am currently using LVM (on debian) for our 2TB NAS here at work. I had
to do a lot of digging because of "NVRAID". I guess this
"hardware-assisted" RAID is all the rage these days. Finally, I realized
that I could completely ignore it and just use pure software RAID via LVM.
That machine also has a Promise SuperTrak EX8350. Nice card. We're
running it in RAID5. So far, good expereinces, haven't run into issues,
so I don't know how well it does in failure situations.
The drivers are open source, and supported under FBSD. Unfortunately, it
On the software side, all of our XServes (3 of 'em, 2 G5 and one Xeon) are
using Apple's software RAID. It's really convenient, but something about
it makes me nervous. I guess since we're just doing RAID-1, it's not such
a big deal, but I'm kind of surprised Apple doesn't ship their
enterprise-class boxes with hardware RAID. Can anyone confirm that the
XServe RAID is honest-to-goodness hardware RAID?
sorry for the ramble!
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