<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@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:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
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]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have plans to rent dedicated servers running on full server sized VMs running on OpenStack, and the servers all will feature 2-tier storage schemes, so that the customers can have both a 10k rpm SAS drive based disk & another SSD based disk on their dedicated server.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Each server will have 6x 6Gb/s 10k rpm SAS disks in 3x3 RAID10, & 2x 6Gb/s SATAIII SSDs in 1x1 RAID1.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The SAS disks are each 300GB, and get divided into 584GB of space for use in processing daily snapshots of both the SAS & SSD customer disk space, and provide 228GB of SAS disk space for cinder-volumes image disk space for the customer.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The SSDs are 64GB each & provides 64GB of cinder-volumes image disk space for the customer.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My concern is with implementing HA, in that how will I be sure that when the VM migrates between servers that the 2 disk images will make it to the right disks on the target server? The 228GB disk image would need to stay on the SAS disk & the 64GB disk image would need to stay on the SSD, regardless of which server it migrates to.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Is there a way to be sure this happens, or will I be unable to use HA?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Regards,<o:p></o:p></p><p class=MsoNormal>Chris<o:p></o:p></p></div></body></html>