Re: RAID-5 recommendations requested
From: Arno Wagner (me_at_privacy.net)
Date: 11/26/04
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Date: 25 Nov 2004 23:57:35 GMT
Previously David M. Siegel <dsiegel@acm.org> wrote:
> I'm planning on building a multipurpose server.
> I intend to use it as, among other things, a file server.
> I'm thinking 4 IDE drives organized as a RAID-5.
> The data will be mostly multimedia, maybe some large
> databases.
> I'm leaning toward 200 or 250 gig drives as most
> cost effective.
> I haven't built a RAID before, so I'm not familiar
> with Hardware RAID/Software RAID tradeoffs.
> I need to learn some more about the performance
> and cost tradeoffs of my various options.
One advantage of software raid is that you can do it on partition
level. I have several set-ups with the System on RAID-1
and the data on RAID5 and a small, unraided boot-partition.
Another advantage is that you are not bound to a specific
hardware, which allways is a problem when using hardware-RAID.
If the controller fails, you can access your data usually only
with the same card or if you are lucky another card from
the same vendor.
>From my experiences with an ADAPTEC sata RAID card (bad
product, stay away) software RAID also has comparable speed
to hardware RAID for IDE and SATA.
The one thing you do not get with software-RAID is hotplugging.
Personally I think for cheaper systems that is the only reason
that could justify hardware-RAID.
And a note to an ealier posting: IDE drives do not run hot
if you mount them like the vendor recommends, i.e. with
sufficient individual airflow. Anything else is begging for
trouble.
Arno
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