Re: HAMMER best practices?

[Justin Sherrill <justin@xxxxxxxxxxxxxxxxxx>]

--bcaec5524380e08ea304d2fa2fc6
Content-Type: text/plain; charset=ISO-8859-1

My immediate thought is that without RAID, a disk failure means that if a
disk fails, you will have to manually take a HAMMER slave PFS and change it
to a master, which should be possible - but will take time.  RAID will
(usually, hopefully) handle a single disk failure without interruption.

The Areca cards are well supported, and I think they've even contributed
hardware for testing.  The arcmsr(4) driver should list what's
supported.  Francois
Tigeot did some testing a while ago:

 http://leaf.dragonflybsd.org/mailarchive/users/2011-04/msg00063.html

Outside of that, I'd suggest building two machines.  Since you can stream
to a slave PFS over a network, have a that second machine as a remote
backup with cheap, large disks with a more generous retention policy - that
way if complete catastrophe strikes, your data's safe.


On Wed, Jan 9, 2013 at 4:20 PM, Dave Hayes <dave@jetcafe.org> wrote:

> Greetings all.
>
> I'm wondering what the best practice is for setting up a network mass
> storage box using HAMMER, assuming you can start from scratch and
> completely control every aspect of the hardware?
>
> Specifically (but general ideas are also welcome), I've used the 3ware (is
> it LSI now?) hardware RAID controllers for some time, but is hardware RAID
> necessary with HAMMER's ability to mirror? Would it be better to just get a
> 4 port SATA controller and let HAMMER mirror the important bits?
>
> Thanks in advance! :D
> --
> Dave Hayes - Consultant - Altadena CA, USA - dave@jetcafe.org
> >>>> *The opinions expressed above are entirely my own* <<<<
>
> Enjoyment is not a goal,
> it is a feeling that accompanies important ongoing activity
>

--bcaec5524380e08ea304d2fa2fc6
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">My immediate thought is that without RAID, a disk failure =
means that if a disk fails, you will have to manually take a HAMMER slave P=
FS and change it to a master, which should be possible - but will take time=
. =A0RAID will (usually, hopefully) handle a single disk failure without in=
terruption. =A0<div>
<br></div><div style><font face=3D"arial, helvetica, sans-serif">The Areca =
cards are well supported, and I think they&#39;ve even contributed hardware=
 for testing. =A0</font><span style=3D"font-family:arial,helvetica,sans-ser=
if">The=A0</span><span style=3D"font-family:arial,helvetica,sans-serif;colo=
r:rgb(0,0,0);font-size:12px;line-height:16.78333282470703px">arcmsr(4) driv=
er should list what&#39;s supported. =A0</span><font face=3D"arial, helveti=
ca, sans-serif">Francois Tigeot did some testing a while ago:</font></div>
<div style><font face=3D"arial, helvetica, sans-serif"><br></font></div><di=
v style><font face=3D"arial, helvetica, sans-serif">=A0<a href=3D"http://le=
af.dragonflybsd.org/mailarchive/users/2011-04/msg00063.html">http://leaf.dr=
agonflybsd.org/mailarchive/users/2011-04/msg00063.html</a></font><span styl=
e=3D"font-family:arial,helvetica,sans-serif">=A0=A0</span></div>
<div style><span style=3D"font-family:arial,helvetica,sans-serif"><br></spa=
n></div><div style><span style=3D"font-family:arial,helvetica,sans-serif">O=
utside of that, I&#39;d suggest building two machines. =A0Since you can str=
eam to a slave PFS over a network, have a that second machine as a remote b=
ackup with cheap, large disks with a more generous retention policy - that =
way if complete catastrophe strikes, your data&#39;s safe.</span></div>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Wed,=
 Jan 9, 2013 at 4:20 PM, Dave Hayes <span dir=3D"ltr">&lt;<a href=3D"mailto=
:dave@jetcafe.org" target=3D"_blank">dave@jetcafe.org</a>&gt;</span> wrote:=
<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-lef=
t:1px #ccc solid;padding-left:1ex">
Greetings all.<br>
<br>
I&#39;m wondering what the best practice is for setting up a network mass s=
torage box using HAMMER, assuming you can start from scratch and completely=
 control every aspect of the hardware?<br>
<br>
Specifically (but general ideas are also welcome), I&#39;ve used the 3ware =
(is it LSI now?) hardware RAID controllers for some time, but is hardware R=
AID necessary with HAMMER&#39;s ability to mirror? Would it be better to ju=
st get a 4 port SATA controller and let HAMMER mirror the important bits?<b=
r>

<br>
Thanks in advance! :D<span class=3D"HOEnZb"><font color=3D"#888888"><br>
-- <br>
Dave Hayes - Consultant - Altadena CA, USA - <a href=3D"mailto:dave@jetcafe=
.org" target=3D"_blank">dave@jetcafe.org</a><br>
&gt;&gt;&gt;&gt; *The opinions expressed above are entirely my own* &lt;&lt=
;&lt;&lt;<br>
<br>
Enjoyment is not a goal,<br>
it is a feeling that accompanies important ongoing activity<br>
</font></span></blockquote></div><br></div>

--bcaec5524380e08ea304d2fa2fc6--