<br><br><div class="gmail_quote">2009/1/5 Patrick Boutilier <span dir="ltr"><<a href="mailto:boutilpj@ednet.ns.ca">boutilpj@ednet.ns.ca</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="Ih2E3d">David Lang wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Sat, 3 Jan 2009, Rob Mueller wrote:<br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
But the new Solid-State-Disks seem very promising. They are claimed to<br>
give 30x the throughput of a 15k rpm disk. If IO improves by 30 times<br>
that should make all these optimizations unnecessary.<br>
As my boss used to tell me ... Good hardware always compensates for<br>
not-so-good software.<br>
</blockquote>
What we've found is that the meta-data (eg mailbox.db, seen db's, quota<br>
files, cyrus.* files) use WAY more IO than the email data, but only use<br>
1/20th the space.<br>
<br>
By separating the meta data onto RAID1 10k/15k RPM drives, and the email<br>
data onto RAID5/6 7.2k RPM drives, you can get a good balance of<br>
space/speed.<br>
</blockquote>
<br>
how do you move the cyrus* files onto other drives?<br>
</blockquote>
<br></div>
metapartition_files and metapartition-default imapd.conf options in cyrus-imapd 2.3.x</blockquote><div><br>So, then, may be we can easily store pure email data on an NFS appliance, keeping metadata on traditionnal filesystem, which can be synced using low level tools<br>
<br>Dom <br></div><div><br> <br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="Wj3C7c"><br>
<br>
<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
David Lang<br>
----<br>
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</blockquote>
<br>
</div></div><br>----<br>
Cyrus Home Page: <a href="http://cyrusimap.web.cmu.edu/" target="_blank">http://cyrusimap.web.cmu.edu/</a><br>
Cyrus Wiki/FAQ: <a href="http://cyrusimap.web.cmu.edu/twiki" target="_blank">http://cyrusimap.web.cmu.edu/twiki</a><br>
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<a href="http://annuaire.univmed.fr/showuser?uid=lalot">http://annuaire.univmed.fr/showuser?uid=lalot</a><br>