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Maurits,
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<div>I'm not sure how you can expect a setup as describe to even work. As far as I know, DRBD does not run on solaris/open solaris/illumous, as a key component is a linux kernel module. Separately, I would NOT recommend running ZFS in linux in production.</div>
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<div>~Noah</div>
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<div>On Dec 10, 2012, at 9:21 AM, Maurits van de Lande <<a href="mailto:M.vandeLande@VDL-Fittings.com">M.vandeLande@VDL-Fittings.com</a>> wrote:</div>
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Hello,<o:p></o:p></div>
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<o:p> </o:p></div>
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<span lang="EN-US">I’m thinking of using ZFS as a low level block device for drbd.<o:p></o:p></span></div>
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<span lang="EN-US">Like:<o:p></o:p></span></div>
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<span lang="EN-US">ZFS<span class="Apple-converted-space"> </span></span><span lang="EN-US" style="font-family: Wingdings; ">à</span><span lang="EN-US"><span class="Apple-converted-space"> </span>drbd<span class="Apple-converted-space"> </span></span><span lang="EN-US" style="font-family: Wingdings; ">à</span><span lang="EN-US"><span class="Apple-converted-space"> </span>LVM<span class="Apple-converted-space"> </span></span><span lang="EN-US" style="font-family: Wingdings; ">à</span><span lang="EN-US"><span class="Apple-converted-space"> </span>iSCSI<o:p></o:p></span></div>
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<span lang="EN-US"> </span></div>
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<span lang="EN-US">The reason is as follows:<o:p></o:p></span></div>
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<span lang="EN-US"> </span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">
<span lang="EN-US">- I would like to speed up reading and writing by using large read and write caches (ssd based) (ZFS ZIL and L2ARC).<o:p></o:p></span></div>
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<span lang="EN-US"> Currently my storage is 100% SSD based. It would be nice if a mixed SSD/HD storage system could be build. $$$.<o:p></o:p></span></div>
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<span lang="EN-US">- I like the copy on write feature of ZFS<o:p></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; ">
<span lang="EN-US">- I like the ZFS snapshot feature and being able to replicate the data to a non drbd system (for backup)<span class="Apple-converted-space"> </span><a href="http://docs.huihoo.com/opensolaris/solaris-zfs-administration-guide/html/ch06.html" style="color: purple; text-decoration: underline; ">http://docs.huihoo.com/opensolaris/solaris-zfs-administration-guide/html/ch06.html</a><o:p></o:p></span></div>
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<span lang="EN-US">- I have tested Flashcache in the past but this did not work reliable in a two node storage cluster setup. For some reason unknown the cached data was not replicated (correctly) to the other drbd node which of course resulted in corrupted
data.<o:p></o:p></span></div>
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<span lang="EN-US">Does anybody have some experience with this kind of setup?<o:p></o:p></span></div>
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<span lang="EN-US">Are there some cons why this setup should not be used?<o:p></o:p></span></div>
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<span lang="EN-US">Best regards,<o:p></o:p></span></div>
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<span lang="EN-US"> </span></div>
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<span lang="EN-US">Maurits van de Lande<o:p></o:p></span></div>
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