Re: How to do a software based RAID 1+0?

[Mark Doe <mark.doe.priv@xxxxxxxxx>]

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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@gmail.com>

> On 26 February 2013 12:14, Samuel J. Greear <sjg@evilcode.net> wrote:
> > On Tue, Feb 26, 2013 at 1:06 PM, Joel Nilsson <joel@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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<div dir=3D"ltr">actually, I have the same questions, as there are no case =
studies and no experiences written on the internet.</div><div class=3D"gmai=
l_extra"><br><br><div class=3D"gmail_quote">2013/3/18 Constantine A. Mureni=
n <span dir=3D"ltr">&lt;<a href=3D"mailto:mureninc@gmail.com"; target=3D"_bl=
ank">mureninc@gmail.com</a>&gt;</span><br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div class=3D"HOEnZb"><div class=3D"h5">On 2=
6 February 2013 12:14, Samuel J. Greear &lt;<a href=3D"mailto:sjg@evilcode.=
net">sjg@evilcode.net</a>&gt; wrote:<br>


&gt; On Tue, Feb 26, 2013 at 1:06 PM, Joel Nilsson &lt;<a href=3D"mailto:jo=
el@alikzus.se">joel@alikzus.se</a>&gt; wrote:<br>
&gt;&gt; Hi,<br>
&gt;&gt;<br>
&gt;&gt; if I want to do soft RAID10 is vinum(8) the way to go?<br>
&gt;&gt;<br>
&gt;&gt; The main purpose is to crank up the I/O rate without loosing too m=
uch reliability.<br>
&gt;&gt;<br>
&gt;&gt; It is intended for my personal/private file server at home, so a t=
emporary loss of availability is not an issue (for now, it may change).<br>
&gt;&gt;<br>
&gt;&gt; Regards,<br>
&gt;&gt; Joel<br>
&gt;<br>
&gt; There are various options for software raid in DragonFly but a<br>
&gt; hardware raid controller is generally considered the most reliable<br>
&gt; option.<br>
&gt;<br>
&gt; Typically though in DragonFly you would hammer mirror-stream between<b=
r>
&gt; disks for redundancy and utilize swapcache to acheive your throughput<=
br>
&gt; needs.<br>
&gt;<br>
&gt; Sam<br>
<br>
</div></div>So, `hammer mirror-stream` is the recommended way for redundanc=
y in<br>
place of software RAID, and where hardware RAID is not available?<br>
<br>
Would such a setup support reliable booting from either volume?<br>
<br>
Provided you have lots of RAM (e.g. 8GB or 16GB), is there a way to<br>
ensure that you aren&#39;t going to be doing any actual IO on the source<br=
>
volume when performing the mirroring?<br>
<br>
If you&#39;re dealing with regular platter-based HDDs, would you<br>
nonetheless configure the second HDD (which is the target of the<br>
`hammer mirror-stream`) as swapcache? =C2=A0Wouldn&#39;t it potentially mak=
e<br>
the performance much worse?<br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
C.<br>
</font></span></blockquote></div><br></div>

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