<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">Sounds like you want to run Raid1
(drbd) over Raid0 (ssd+md?). This is more fragile than Raid0 over
Raid1, so you might consider implementing Raid0 using DM over
multiple drbd devices, each mirroring a single ssd.<br>
<br>
Regards,<br>
Andreas<br>
<br>
On 07/23/14 17:45, Robinson, Eric wrote:<br>
</div>
<blockquote
cite="mid:A444830975772149AA75636742443BF46A369B79@psm-exch02.psm.local"
type="cite">
<meta http-equiv="Content-Type" content="text/html;
charset=ISO-8859-1">
<meta name="Generator" content="Microsoft Word 15 (filtered
medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
<!--ppd1000037-->
<div class="WordSection1">
<p class="MsoNormal">We have many DRBD clusters in production
and it has always worked great. Our cluster nodes have always
had RAID 5 arrays consisting 6x spinning drives. Recently we
started using servers with SSD drives. After some research, we
find that RAID 5 is not recommended because it (supposedly)
causes write amplification and shortens the life of the
drives. However, we really do not want to give up storage
space by switching to RAID 10. We are seriously considering
using RAID 0 in our database servers, and using DRBD as
“network RAID 1.” What do you guys think of that? Terrible
idea?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">--<o:p></o:p></p>
<p class="MsoNormal">Eric Robinson<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<br>
<font color="silver"><span style="FONT-SIZE: 7.5pt; COLOR: gray;
FONT-FAMILY: Verdana"><font size="1">Disclaimer - July 23,
2014</font></span></font> <font size="1"><font
face="Verdana" color="gray"><span style="FONT-SIZE: 7.5pt;
COLOR: gray; FONT-FAMILY: Verdana">This email and any files
<font size="1">transmitted</font> with it are confidential
and intended solely for <strong><a class="moz-txt-link-abbreviated" href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a></strong></span></font><font
face="Verdana" color="gray"><span style="FONT-SIZE: 7.5pt;
COLOR: gray; FONT-FAMILY: Verdana">. If you are not the
named addressee you should not disseminate, distribute, copy
or alter this email. Any views or opinions presented in this
email are solely those of the author and might not represent
those of Physicians' Managed Care or Physician Select
Management. Warning: Although Physicians' Managed Care or
Physician Select Management has taken reasonable precautions
to ensure no viruses are present in this email, the company
cannot accept responsibility for any loss or damage arising
from the use of this email or attachments.</span></font></font>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
drbd-user mailing list
<a class="moz-txt-link-abbreviated" href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a>
<a class="moz-txt-link-freetext" href="http://lists.linbit.com/mailman/listinfo/drbd-user">http://lists.linbit.com/mailman/listinfo/drbd-user</a>
</pre>
</blockquote>
<br>
</body>
</html>