Date: Tue, 27 Jul 2010 08:28:03 +0100 From: krad <kraduk@googlemail.com> To: Chuck Swiger <cswiger@mac.com> Cc: John Almberg <jalmberg@identry.com>, freebsd-questions@freebsd.org Subject: Re: 1 file system, 2 drives? Message-ID: <AANLkTikwW_gOO0NMzK%2B-L0vthuXJxiiqRGA43u6TJpTS@mail.gmail.com> In-Reply-To: <980022A0-7623-40A5-BCDE-4909A721933D@mac.com> References: <4C4DDA28.4070205@identry.com> <980022A0-7623-40A5-BCDE-4909A721933D@mac.com>
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On 26 July 2010 20:05, Chuck Swiger <cswiger@mac.com> wrote: > Hi, John-- > > On Jul 26, 2010, at 11:55 AM, John Almberg wrote: > > I know this is probably impossible, but FreeBSD can do so many miraculous > things, that I can't help asking... > > > > Is it possible to use the second drive to 'expand' the /videos file > system? So it would miraculously look like a single 400G drive? > > The canonical way of doing this is to either create a RAID-0 concat or > stripe volume. Using RAID-0 striping is preferred due to performance, but > you'd need to backup, reformat using a RAID-0 stripe, and then restore your > data onto the new volume. In theory, setting up a concat is less intrusive, > but if the data is already mounted and in use, you'll probably still need to > unmount it first. > > If you have hardware controller with RAID capabilities, using native RAID > is better, otherwise look towards gvinum or maybe ccd; see also: > > http://www.freebsd.org/doc/en/books/handbook/raid.html > > Regards, > -- > -Chuck > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" > I dont agree that hardware raid is necessarily better. It really depends on what the system is doing. If for example it is purely acting as a filer I would always use software raid. The main reason for this is that you benefit from the faster CPU, and more intelligent raid software (zfs). You are also not tied to a particular hardware platform which makes future upgrades easier. If however the system is doing lots of other things and you dont want the overhead of a software raid solution, it makes sense to offload it to a hardware solution
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