Date: Tue, 11 Mar 2003 10:36:21 -0500 From: Chuck Swiger <cswiger@mac.com> To: freebsd Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: Difference between Vinum and atacontrol RAID? Message-ID: <3E6E0275.2020408@mac.com> In-Reply-To: <20030311032738.GB1912@bubba.toscano.org> References: <20030309233502.GC1899@bubba.toscano.org> <3E6BE734.4040804@mac.com> <20030311032738.GB1912@bubba.toscano.org>
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Pete wrote: [ ... ] > The RAID-1 volume I'm using right now is with two drives attached to > a non-RAID card with a Promise chipset. Does it work if you move the two drives to another machine without a Promise, Highpoint, or other RAID controller card or MB chipset...? >> Hardware based RAID is likely to be faster, particularly in the case >> of parity calculations for RAID-5. (Not that many IDE controllers can >> do RAID-5, but...) > > It would be, but the RAID on the Promise and Highpoint devices is not > true hardware RAID. It's just software RAID with the drivers moved over > to an EPROM on the card. When you write to a RAID-1 mirror on such a device, does the CPU and PCI bus see two copies of the data? Or does the Promise or HPT deal with distributing the data across the right devices itself? > I know from my own experience and that of > other people that the Linux software RAID outperforms the "hardware" > RAID of these devices. I'm willing to bet that the FreeBSD RAID at > least comes close, if not betters the Linux performance. Software-based RAID can do fine for things like -0 & -1; but without numbers, subjective discussion of performance can be misleading.... -Chuck To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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