How to do a software based RAID 1+0?

[Mark Doe]

actually, I have the same questions, as there are no case studies and no
experiences written on the internet.


2013/3/18 Constantine A. Murenin <mureninc at gmail.com>

> On 26 February 2013 12:14, Samuel J. Greear <sjg at evilcode.net> wrote:
> > On Tue, Feb 26, 2013 at 1:06 PM, Joel Nilsson <joel at alikzus.se> wrote:
> >> Hi,
> >>
> >> if I want to do soft RAID10 is vinum(8) the way to go?
> >>
> >> The main purpose is to crank up the I/O rate without loosing too much
> reliability.
> >>
> >> It is intended for my personal/private file server at home, so a
> temporary loss of availability is not an issue (for now, it may change).
> >>
> >> Regards,
> >> Joel
> >
> > There are various options for software raid in DragonFly but a
> > hardware raid controller is generally considered the most reliable
> > option.
> >
> > Typically though in DragonFly you would hammer mirror-stream between
> > disks for redundancy and utilize swapcache to acheive your throughput
> > needs.
> >
> > Sam
>
> So, `hammer mirror-stream` is the recommended way for redundancy in
> place of software RAID, and where hardware RAID is not available?
>
> Would such a setup support reliable booting from either volume?
>
> Provided you have lots of RAM (e.g. 8GB or 16GB), is there a way to
> ensure that you aren't going to be doing any actual IO on the source
> volume when performing the mirroring?
>
> If you're dealing with regular platter-based HDDs, would you
> nonetheless configure the second HDD (which is the target of the
> `hammer mirror-stream`) as swapcache?  Wouldn't it potentially make
> the performance much worse?
>
> C.
>
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