Date: Mon, 27 May 2002 15:35:52 +0200 From: Miguel Mendez <flynn@energyhq.homeip.net> To: Cy Schubert - CITS Open Systems Group <Cy.Schubert@uumail.gov.bc.ca> Cc: Kirk Strauser <kirk@strauser.com>, freebsd-stable@FreeBSD.ORG Subject: Re: Hardware RAID vs vinum Message-ID: <20020527153552.A72342@energyhq.homeip.net> In-Reply-To: <200205271302.g4RD2Nr1099239@cwsys.cwsent.com>; from Cy.Schubert@uumail.gov.bc.ca on Mon, May 27, 2002 at 06:02:23AM -0700 References: <kirk@strauser.com> <200205271302.g4RD2Nr1099239@cwsys.cwsent.com>
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On Mon, May 27, 2002 at 06:02:23AM -0700, Cy Schubert - CITS Open Systems Group wrote:
Hi,
> Did we see a difference in CPU utilization? No. However ODS and VxVM
> run below the kernel and cannot be measured by vmstat or sar, which is
> different to how vinum works because it is part of the kernel.
I feel curious about this. Both ODS and VxVM are just kernel modules
that sit between hardware and the VFS layer if I'm not mistaken. What
makes them different than vinum? I think vinum is, essentially, a Volume
Manager clone, with it's own enhancements, so I'd expect a simillar
behaviour of both programs. OTOH, and don't quote me on this because
it's been almost 2 years since I last used VxVM, there's a way to gather
cpu/system resources usage with some tools that come with Volume
Manager.
I agree that having hardware RAID in a box that is running a Database
will improve performance noticeably. OTOH, if the box is just a NAS,
you'll probably be fine with some sort of software RAID system (be it
vinum/raidframe or whatever your OS uses).
Sorry for getting a bit off-topic.
Cheers,
--
Miguel Mendez - flynn@energyhq.homeip.net
GPG Public Key :: http://energyhq.homeip.net/files/pubkey.txt
EnergyHQ :: http://www.energyhq.tk
FreeBSD - The power to serve!
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